[JavaWeb]微头条项目

完整笔记和项目代码：
https://pan.baidu.com/s/1PZBO0mfpwDPic4Ezsk8orA?pwd=wwp5 提取码: wwp5

JavaWeb-微头条项目开发

1 项目简介

1.1 业务介绍

微头条新闻发布和浏览平台,主要包含业务如下

• 用户功能
  • 注册功能
  • 登录功能
• 头条新闻
  • 新闻的分页浏览
  • 通过标题关键字搜索新闻
  • 查看新闻详情
  • 新闻的修改和删除
• 权限控制
  • 用户只能修改和自己发布的头条新闻

1.2 技术栈介绍

前端技术栈

• ES6作为基础JS语法
• nodejs用于运行环境
• npm用于项目依赖管理工具
• vite用于项目的构建架工具
• Vue3用于项目数据的渲染框架
• Axios用于前后端数据的交互
• Router用于页面的跳转
• Pinia用于存储用户的数据
• LocalStorage作为用户校验token的存储手段
• Element-Plus提供组件

后端技术栈

• JAVA作为开发语言,版本为JDK17
• Tomcat作为服务容器,版本为10.1.7
• Mysql8用于项目存储数据
• Servlet用于控制层实现前后端数据交互
• JDBC用于实现数据的CURD
• Druid用于提供数据源的连接池
• MD5用于用户密码的加密
• Jwt用于token的生成和校验
• Jackson用于转换JSON
• Filter用于用户登录校验和跨域处理
• Lombok用于处理实体类

1.3 后端项目结构

创建Web项目

导入依赖

准备包结构

• controller 控制层代码,主要由Servlet组成
• service 服务层代码,主要用于处理业务逻辑
• dao 数据访问层,主要用户定义对于各个表格的CURD的方法
• pojo 实体类层,主要用于存放和数据库对应的实体类以及一些VO对象
• util 工具类包,主要用存放一些工具类
• common 公共包,主要用户存放一些其他公共代码
• filters 过滤器包,专门用于存放一些过滤器
• test 测试代码包,专门用于定义一些测试的功能代码,上线前应该删掉,后期用maven可以自动处理掉

2 项目框架源码和注解

2.1 工具类

2.1.1 异步响应规范格式类

• Result类

package com.atguigu.headline.common;

/**
 * 全局统一返回结果类
 *
 */
public class Result<T> {
    // 返回码
    private Integer code;
    // 返回消息
    private String message;
    // 返回数据
    private T data;
    public Result(){}
    // 返回数据
    protected static <T> Result<T> build(T data) {
        Result<T> result = new Result<T>();
        if (data != null)
            result.setData(data);
        return result;
    }
    public static <T> Result<T> build(T body, Integer code, String message) {
        Result<T> result = build(body);
        result.setCode(code);
        result.setMessage(message);
        return result;
    }
    public static <T> Result<T> build(T body, ResultCodeEnum resultCodeEnum) {
        Result<T> result = build(body);
        result.setCode(resultCodeEnum.getCode());
        result.setMessage(resultCodeEnum.getMessage());
        return result;
    }
    /**
     * 操作成功
     * @param data  baseCategory1List
     * @param <T>
     * @return
     */
    public static<T> Result<T> ok(T data){
        Result<T> result = build(data);
        return build(data, ResultCodeEnum.SUCCESS);
    }
    public Result<T> message(String msg){
        this.setMessage(msg);
        return this;
    }
    public Result<T> code(Integer code){
        this.setCode(code);
        return this;
    }
    public Integer getCode() {
        return code;
    }
    public void setCode(Integer code) {
        this.code = code;
    }
    public String getMessage() {
        return message;
    }
    public void setMessage(String message) {
        this.message = message;
    }
    public T getData() {
        return data;
    }
    public void setData(T data) {
        this.data = data;
    }
}

• ResultCodeEnum 枚举类

package com.atguigu.headline.common;
/**
 * 统一返回结果状态信息类
 *
 */
public enum ResultCodeEnum {

    SUCCESS(200,"success"),
    USERNAME_ERROR(501,"usernameError"),
    PASSWORD_ERROR(503,"passwordError"),
    NOTLOGIN(504,"notLogin"),
    USERNAME_USED(505,"userNameUsed");

    private Integer code;
    private String message;
    private ResultCodeEnum(Integer code, String message) {
        this.code = code;
        this.message = message;
    }
    public Integer getCode() {
        return code;
    }
    public String getMessage() {
        return message;
    }
}

2.1.2 MD5加密工具类

package com.atguigu.headline.util;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public final class MD5Util {
    public static String encrypt(String strSrc) {
        try {
            char hexChars[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8',
                    '9', 'a', 'b', 'c', 'd', 'e', 'f' };
            byte[] bytes = strSrc.getBytes();
            MessageDigest md = MessageDigest.getInstance("MD5");
            md.update(bytes);
            bytes = md.digest();
            int j = bytes.length;
            char[] chars = new char[j * 2];
            int k = 0;
            for (int i = 0; i < bytes.length; i++) {
                byte b = bytes[i];
                chars[k++] = hexChars[b >>> 4 & 0xf];
                chars[k++] = hexChars[b & 0xf];
            }
            return new String(chars);
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
            throw new RuntimeException("MD5加密出错！！+" + e);
        }
    }
}

2.1.3 JDBCUtil连接池工具类

package com.atguigu.headline.util;

import com.alibaba.druid.pool.DruidDataSourceFactory;

import javax.sql.DataSource;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.Properties;

public class JDBCUtil {
    private static ThreadLocal<Connection> threadLocal =new ThreadLocal<>();

    private static DataSource dataSource;
    // 初始化连接池
    static{
        // 可以帮助我们读取.properties配置文件
        Properties properties =new Properties();
        InputStream resourceAsStream = JDBCUtil.class.getClassLoader().getResourceAsStream("jdbc.properties");
        try {
            properties.load(resourceAsStream);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }

        try {
            dataSource = DruidDataSourceFactory.createDataSource(properties);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }


    }
    /*1 向外提供连接池的方法*/
    public static DataSource getDataSource(){
        return dataSource;
    }

    /*2 向外提供连接的方法*/
    public static Connection getConnection(){
        Connection connection = threadLocal.get();
        if (null == connection) {
            try {
                connection = dataSource.getConnection();
            } catch (SQLException e) {
                throw new RuntimeException(e);
            }
            threadLocal.set(connection);
        }

        return connection;
    }


    /*定义一个归还连接的方法 (解除和ThreadLocal之间的关联关系) */
    public static void releaseConnection(){
        Connection connection = threadLocal.get();
        if (null != connection) {
            threadLocal.remove();
            // 把连接设置回自动提交的连接
            try {
                connection.setAutoCommit(true);
                // 自动归还到连接池
                connection.close();
            } catch (SQLException e) {
                throw new RuntimeException(e);
            }
        }
    }
}

添加jdbc.properties配置文件

driverClassName=com.mysql.cj.jdbc.Driver
url=jdbc:mysql://localhost:3306/top_news
username=root
password=root
initialSize=5
maxActive=10
maxWait=1000

2.1.4 JwtHelper工具类

package com.atguigu.headline.util;

import com.alibaba.druid.util.StringUtils;
import io.jsonwebtoken.*;

import java.util.Date;

public class JwtHelper {
    private static long tokenExpiration = 24*60*60*1000;
    private static String tokenSignKey = "123456";

    //生成token字符串
    public static String createToken(Long userId) {
        String token = Jwts.builder()

                .setSubject("YYGH-USER")
                .setExpiration(new Date(System.currentTimeMillis() + tokenExpiration))
                .claim("userId", userId)
                .signWith(SignatureAlgorithm.HS512, tokenSignKey)
                .compressWith(CompressionCodecs.GZIP)
                .compact();
        return token;
    }

    //从token字符串获取userid
    public static Long getUserId(String token) {
        if(StringUtils.isEmpty(token)) return null;
        Jws<Claims> claimsJws = Jwts.parser().setSigningKey(tokenSignKey).parseClaimsJws(token);
        Claims claims = claimsJws.getBody();
        Integer userId = (Integer)claims.get("userId");
        return userId.longValue();
    }



    //判断token是否有效
    public static boolean isExpiration(String token){
        try {
            boolean isExpire = Jwts.parser()
                    .setSigningKey(tokenSignKey)
                    .parseClaimsJws(token)
                    .getBody()
                    .getExpiration().before(new Date());
            //没有过期，有效，返回false
            return isExpire;
        }catch(Exception e) {
            //过期出现异常，返回true
            return true;
        }
    }
}

2.1.5 JSON转换的WEBUtil工具类

package com.atguigu.headline.util;

import com.atguigu.headline.common.Result;
import com.fasterxml.jackson.databind.ObjectMapper;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import java.io.BufferedReader;
import java.io.IOException;
import java.text.SimpleDateFormat;

public class WebUtil {
    private static ObjectMapper objectMapper;
    // 初始化objectMapper
    static{
        objectMapper=new ObjectMapper();
        // 设置JSON和Object转换时的时间日期格式
        objectMapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));
    }
// 从请求中获取JSON串并转换为Object
    public static <T> T readJson(HttpServletRequest request,Class<T> clazz){
        T t =null;
        BufferedReader reader = null;
        try {
            reader = request.getReader();
            StringBuffer buffer =new StringBuffer();
            String line =null;
            while((line = reader.readLine())!= null){
                buffer.append(line);
            }

            t= objectMapper.readValue(buffer.toString(),clazz);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        return t;
    }
// 将Result对象转换成JSON串并放入响应对象
    public static void writeJson(HttpServletResponse response, Result result){
        response.setContentType("application/json;charset=UTF-8");
        try {
            String json = objectMapper.writeValueAsString(result);
            response.getWriter().write(json);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}

2.2 实体类和VO对象

2.2.1 NewsUser

package com.atguigu.headline.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import java.io.Serializable;

@AllArgsConstructor
@NoArgsConstructor
@Data
public class NewsUser implements Serializable {
    private Integer uid;
    private String username;
    private String userPwd;
    private String nickName;
}

2.2.2 NewsType

package com.atguigu.headline.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import java.io.Serializable;

@AllArgsConstructor
@NoArgsConstructor
@Data
public class NewsType implements Serializable {
    private Integer tid;
    private String tname;
}

2.2.3 NewsHeadline

package com.atguigu.headline.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import java.io.Serializable;
import java.util.Date;

@AllArgsConstructor
@NoArgsConstructor
@Data
public class NewsHeadline implements Serializable {
    private Integer hid;
    private String title;
    private String article;
    private Integer type;
    private Integer publisher;
    private Integer pageViews;
    private Date createTime;
    private Date updateTime;
    private Integer isDeleted;

}

2.2.4 HeadlineQueryVo

package com.atguigu.headline.pojo.vo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import java.io.Serializable;

@AllArgsConstructor
@NoArgsConstructor
@Data
public class HeadlineQueryVo implements Serializable {
    private String keyWords;
    private Integer type ;
    private Integer pageNum;
    private Integer pageSize;
}

2.2.5 HeadlinePageVo

package com.atguigu.headline.pojo.vo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import java.io.Serializable;

@AllArgsConstructor
@NoArgsConstructor
@Data
public class HeadlinePageVo implements Serializable {
    private Integer hid;
    private String title;
    private Integer type;
    private Integer pageViews;
    private Long pastHours;
    private Integer publisher;
}

2.2.6 HeadlineDetailVo

package com.atguigu.headline.pojo.vo;


import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import java.io.Serializable;

@AllArgsConstructor
@NoArgsConstructor
@Data
public class HeadlineDetailVo implements Serializable {
    private Integer hid;
    private String title;
    private String article;
    private Integer type;
    private String typeName;
    private Integer pageViews;
    private Long pastHours;
    private Integer publisher;
    private String author;
}

2.3 Dao层

BaseDao基础类,封装了公共的查询方法和公共的增删改方法

注意,所有的Dao接口的实现类都要继承BaseDao

2.3.1 BaseDao

package com.atguigu.headline.dao;


import com.atguigu.headline.util.JDBCUtil;
import java.lang.reflect.Field;
import java.sql.*;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.List;

public class BaseDao {
    // 公共的查询方法  返回的是单个对象
    public <T> T baseQueryObject(Class<T> clazz, String sql, Object ... args) {
        T t = null;
        Connection connection = JDBCUtil.getConnection();
        PreparedStatement preparedStatement = null;
        ResultSet resultSet = null;
        int rows = 0;
        try {
            // 准备语句对象
            preparedStatement = connection.prepareStatement(sql);
            // 设置语句上的参数
            for (int i = 0; i < args.length; i++) {
                preparedStatement.setObject(i + 1, args[i]);
            }

            // 执行 查询
            resultSet = preparedStatement.executeQuery();
            if (resultSet.next()) {
                t = (T) resultSet.getObject(1);
            }
        } catch (Exception e) {
            throw new RuntimeException(e);
        } finally {
            if (null != resultSet) {
                try {
                    resultSet.close();
                } catch (SQLException e) {
                    throw new RuntimeException(e);
                }
            }
            if (null != preparedStatement) {
                try {
                    preparedStatement.close();
                } catch (SQLException e) {
                    throw new RuntimeException(e);
                }

            }
            JDBCUtil.releaseConnection();
        }
        return t;
    }
    // 公共的查询方法  返回的是对象的集合

    public <T> List<T> baseQuery(Class clazz, String sql, Object ... args){
        List<T> list =new ArrayList<>();
        Connection connection = JDBCUtil.getConnection();
        PreparedStatement preparedStatement=null;
        ResultSet resultSet =null;
        int rows = 0;
        try {
            // 准备语句对象
            preparedStatement = connection.prepareStatement(sql);
            // 设置语句上的参数
            for (int i = 0; i < args.length; i++) {
                preparedStatement.setObject(i+1,args[i]);
            }

            // 执行 查询
            resultSet = preparedStatement.executeQuery();

            ResultSetMetaData metaData = resultSet.getMetaData();
            int columnCount = metaData.getColumnCount();

            // 将结果集通过反射封装成实体类对象
            while (resultSet.next()) {
                // 使用反射实例化对象
                Object obj =clazz.getDeclaredConstructor().newInstance();

                for (int i = 1; i <= columnCount; i++) {
                    String columnName = metaData.getColumnLabel(i);
                    Object value = resultSet.getObject(columnName);
                    // 处理datetime类型字段和java.util.Data转换问题
                    if(value.getClass().equals(LocalDateTime.class)){
                        value= Timestamp.valueOf((LocalDateTime) value);
                    }
                    Field field = clazz.getDeclaredField(columnName);
                    field.setAccessible(true);
                    field.set(obj,value);
                }

                list.add((T)obj);
            }

        } catch (Exception e) {
            throw new RuntimeException(e);
        } finally {
            if (null !=resultSet) {
                try {
                    resultSet.close();
                } catch (SQLException e) {
                    throw new RuntimeException(e);
                }
            }
            if (null != preparedStatement) {
                try {
                    preparedStatement.close();
                } catch (SQLException e) {
                    throw new RuntimeException(e);
                }
            }
            JDBCUtil.releaseConnection();
        }
        return list;
    }
    
    // 通用的增删改方法
    public int baseUpdate(String sql,Object ... args) {
        // 获取连接
        Connection connection = JDBCUtil.getConnection();
        PreparedStatement preparedStatement=null;
        int rows = 0;
        try {
            // 准备语句对象
            preparedStatement = connection.prepareStatement(sql);
            // 设置语句上的参数
            for (int i = 0; i < args.length; i++) {
                preparedStatement.setObject(i+1,args[i]);
            }

            // 执行 增删改 executeUpdate
            rows = preparedStatement.executeUpdate();
            // 释放资源(可选)


        } catch (SQLException e) {
            throw new RuntimeException(e);
        } finally {
            if (null != preparedStatement) {
                try {
                    preparedStatement.close();
                } catch (SQLException e) {
                    throw new RuntimeException(e);
                }

            }
            JDBCUtil.releaseConnection();
        }
        // 返回的是影响数据库记录数
        return rows;
    }
}

2.3.2 Dao层所有接口

package com.atguigu.headline.dao;
public interface NewsHeadLineDao {
    
}

package com.atguigu.headline.dao;
public interface NewsTypeDao {
    
}


package com.atguigu.headline.dao;
public interface NewsUserDao {

}

2.3.3 dao层所有实现类

package com.atguigu.headline.dao.impl;
import com.atguigu.headline.dao.BaseDao;
import com.atguigu.headline.dao.NewsHeadLineDao;
public class NewsHeadlineDaoImpl extends BaseDao implements NewsHeadLineDao{
    
}

package com.atguigu.headline.dao.impl;
import com.atguigu.headline.dao.BaseDao;
import com.atguigu.headline.dao.NewsTypeDao;
public class NewsTypeDaoImpl extends BaseDao implements NewsTypeDao{
    
}

package com.atguigu.headline.dao.impl;
import com.atguigu.headline.dao.BaseDao;
import com.atguigu.headline.dao.NewsUserDao;
public class NewsUserDaoImpl extends BaseDao implements NewsUserDao{
    
}

2.4 Service层

2.4.1 service层所有接口

package com.atguigu.headline.service;
public interface NewsHeadlineService {
    
}

package com.atguigu.headline.service;
public interface NewsTypeService {
    List<NewsType> findAll();
}

package com.atguigu.headline.service;
public interface NewsUserService {
    
}

2.4.2 service层所有实现类

package com.atguigu.headline.service.impl;
import com.atguigu.headline.service.NewsHeadlineService;
public class NewsHeadlineServiceImpl  implements NewsHeadlineService {
}


package com.atguigu.headline.service.impl;
import com.atguigu.headline.service.NewsTypeService;
public class NewsTypeServiceImpl implements NewsTypeService {
  
}

package com.atguigu.headline.service.impl;
import com.atguigu.headline.service.NewsUserService;
public class NewsUserServiceImpl implements NewsUserService {
   
}

2.5 Controller层

BaseController 用于将路径关联到处理方法的基础控制器，所有的Controller都要继承该类

2.5.1 BaseController

package com.atguigu.headline.controller;

import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import java.io.IOException;
import java.lang.reflect.Method;

public class BaseController extends HttpServlet {
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        // 响应的MIME类型和乱码问题
        resp.setContentType("application/json;charset=UTF-8");

        String requestURI = req.getRequestURI();
        String[] split = requestURI.split("/");
        String methodName =split[split.length-1];
        // 通过反射获取要执行的方法
        Class clazz = this.getClass();
        try {
            Method method=clazz.getDeclaredMethod(methodName,HttpServletRequest.class,HttpServletResponse.class);
            // 设置方法可以访问
            method.setAccessible(true);
            // 通过反射执行代码
            method.invoke(this,req,resp);
        } catch (Exception e) {
            e.printStackTrace();
            throw new RuntimeException(e.getMessage());
        }
    }
}

2.5.2 所有的Controller类

package com.atguigu.headline.controller;
import jakarta.servlet.annotation.WebServlet;
@WebServlet("/headline/*")
public class NewsHeadlineController extends BaseController {
    
}

package com.atguigu.headline.controller;
import jakarta.servlet.annotation.WebServlet;
@WebServlet("/type/*")
public class NewsTypeController {
    
}

package com.atguigu.headline.controller;
import jakarta.servlet.annotation.WebServlet;
@WebServlet("/user/*")
public class NewsUserController extends BaseController{
    
}

package com.atguigu.headline.controller;
import jakarta.servlet.annotation.WebServlet;
@WebServlet("/portal/*")
public class PortalController extends BaseController{
    
}

2.6 过滤器

2.6.1 跨域过滤器

package com.atguigu.headline.filters;

import jakarta.servlet.*;
import jakarta.servlet.annotation.WebFilter;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import java.io.IOException;

@WebFilter("/*")
public class CrosFilter implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        HttpServletRequest request =(HttpServletRequest) servletRequest;
        response.setHeader("Access-Control-Allow-Origin", "*");
        response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE, HEAD");
        response.setHeader("Access-Control-Max-Age", "3600");
        response.setHeader("Access-Control-Allow-Headers", "access-control-allow-origin, authority, content-type, version-info, X-Requested-With");
        // 非预检请求,放行即可,预检请求,则到此结束,不需要放行
        if(!request.getMethod().equalsIgnoreCase("OPTIONS")){
            filterChain.doFilter(servletRequest, servletResponse);
        }
    }
}

3 项目具体实现

3.1 登录注册功能

3.1.1 登录表单提交

需求描述

• 用户在客户端输入用户名密码并向后端提交,后端根据用户名和密码判断登录是否成功,用户有误或者密码有误响应不同的提示信息

uri:

user/login

请求方式:

POST

请求参数

{
    "username":"zhangsan", //用户名
    "userPwd":"123456"     //明文密码
}

响应示例

• 登录成功

{
    "code":"200",         // 成功状态码 
 "message":"success"   // 成功状态描述
 "data":{
"token":"... ..." // 用户id的token
}
}

• 用户名有误

{
    "code":"501",
 "message":"用户名有误"
 "data":{}
}

• 密码有误

{
    "code":"503",
 "message":"密码有误"
 "data":{}
}

后端代码

• NewsUserController

package com.atguigu.headline.controller;

import com.atguigu.headline.common.Result;
import com.atguigu.headline.common.ResultCodeEnum;
import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.NewsUser;
import com.atguigu.headline.service.NewsUserService;
import com.atguigu.headline.service.impl.NewsUserServiceImpl;
import com.atguigu.headline.util.JwtHelper;
import com.atguigu.headline.util.MD5Util;
import com.atguigu.headline.util.WebUtil;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;


@WebServlet("/user/*")
public class NewsUserController extends BaseController{

    private NewsUserService newsUserService =new NewsUserServiceImpl();
     /**
     * 登录验证
     * @param req
     * @param resp
     * @throws ServletException
     * @throws IOException
     */
    protected void login(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        NewsUser newsUser = WebUtil.readJson(req, NewsUser.class);

        Result result =null;
        NewsUser loginNewsUser =newsUserService.findByUserName(newsUser.getUsername());
        // 判断用户名
        if (null != loginNewsUser) {
            // 判断密码
            if(loginNewsUser.getUserPwd().equals(MD5Util.encrypt(newsUser.getUserPwd()))){
                // 密码正确
                Map<String,Object> data =new HashMap<>();
                // 生成token口令
                String token = JwtHelper.createToken(loginNewsUser.getUid().longValue());
                // 封装数据map
                data.put("token",token);
                // 封装结果
                result=Result.ok(data);
            }else{
                // 封装密码错误结果
                result=Result.build(null, ResultCodeEnum.PASSWORD_ERROR);
            }
        }else{
            // 封装用户名错误结果
            result=Result.build(null, ResultCodeEnum.USERNAME_ERROR);
        }
        // 响应结果
        WebUtil.writeJson(resp,result);
    }
}

• NewsUserService

package com.atguigu.headline.service;

import com.atguigu.headline.pojo.NewsUser;

public interface NewsUserService {
    /**
     * 根据用户名,获得查询用户的方法
     * @param username 要查询的用户名
     * @return 如果找到返回NewsUser对象,找不到返回null
     */
    NewsUser findByUserName(String username);
}

• NewsUserServiceImpl

package com.atguigu.headline.service.impl;

import com.atguigu.headline.dao.NewsUserDao;
import com.atguigu.headline.dao.impl.NewsUserDaoImpl;
import com.atguigu.headline.pojo.NewsUser;
import com.atguigu.headline.service.NewsTypeService;
import com.atguigu.headline.service.NewsUserService;
import com.atguigu.headline.util.MD5Util;

public class NewsUserServiceImpl implements NewsUserService {
    private NewsUserDao newsUserDao =new NewsUserDaoImpl();
    @Override
    public NewsUser findByUserName(String username) {
        return newsUserDao.findByUserName(username);
    }
}

• NewUserDao

package com.atguigu.headline.dao;
import com.atguigu.headline.pojo.NewsUser;

public interface NewsUserDao {
    /**
     * 根据用户名查询用户信息
     * @param username 要查询的用户名
     * @return 找到返回NewsUser对象,找不到返回null
     */
    NewsUser findByUserName(String username);
}

• NewsUserDaoImpl

package com.atguigu.headline.dao.impl;

import com.atguigu.headline.dao.BaseDao;
import com.atguigu.headline.dao.NewsUserDao;
import com.atguigu.headline.pojo.NewsUser;
import java.util.List;

public class NewsUserDaoImpl extends BaseDao implements NewsUserDao {

    @Override
    public NewsUser findByUserName(String username) {
        // 准备SQL
        String sql ="select uid,username,user_pwd userPwd ,nick_name nickName from news_user where username = ?";
        // 调用BaseDao公共查询方法
        List<NewsUser> newsUserList = baseQuery(NewsUser.class, sql, username);
        // 如果找到,返回集合中的第一个数据(其实就一个)
        if (null != newsUserList && newsUserList.size()>0){
            return  newsUserList.get(0);
        }
        return null;
    }
}

3.1.2 根据token获取完整用户信息

需求描述

• 客户端发送请求,提交token请求头,后端根据token请求头获取登录用户的详细信息并响应给客户端进行存储

uri

user/getUserInfo

请求方式

GET

请求头

token: ... ...

响应示例

• 成功获取

{
    "code": 200,
    "message": "success",
    "data": {
        "loginUser": {
            "uid": 1,
            "username": "zhangsan",
            "userPwd": "",
            "nickName": "张三"
        }
    }
}

• 获取失败

{
    "code": 504,
    "message": "notLogin",
    "data": null
}

后端代码

• NewsUserController

package com.atguigu.headline.controller;

import com.atguigu.headline.common.Result;
import com.atguigu.headline.common.ResultCodeEnum;
import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.NewsUser;
import com.atguigu.headline.service.NewsUserService;
import com.atguigu.headline.service.impl.NewsUserServiceImpl;
import com.atguigu.headline.util.JwtHelper;
import com.atguigu.headline.util.MD5Util;
import com.atguigu.headline.util.WebUtil;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;


@WebServlet("/user/*")
public class NewsUserController extends BaseController{

    private NewsUserService newsUserService =new NewsUserServiceImpl();

    /**
     * 接收token,根据token查询完整用户信息
     * @param req
     * @param resp
     * @throws ServletException
     * @throws IOException
     */
    protected void getUserInfo(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String token = req.getHeader("token");
        Result  result =Result.build(null,ResultCodeEnum.NOTLOGIN);
        if(null!= token){
            if (!JwtHelper.isExpiration(token)) {
                Integer uid = JwtHelper.getUserId(token).intValue();
                NewsUser newsUser =newsUserService.findByUid(uid);
                newsUser.setUserPwd("");
                Map<String,Object> data =new HashMap<>();
                data.put("loginUser",newsUser);
                result=Result.ok(data);

            }
        }
        WebUtil.writeJson(resp,result);
    }
}

• NewsUserService

package com.atguigu.headline.service;

import com.atguigu.headline.pojo.NewsUser;

public interface NewsUserService {
    /**
     * 根据用户id查询用户信息
     * @param uid 要查询的用户id
     * @return 找到返回NewsUser对象,找不到返回null
     */
    NewsUser findByUid(Integer uid);
}

• NewsUserServiceImpl

package com.atguigu.headline.service.impl;

import com.atguigu.headline.dao.NewsUserDao;
import com.atguigu.headline.dao.impl.NewsUserDaoImpl;
import com.atguigu.headline.pojo.NewsUser;
import com.atguigu.headline.service.NewsTypeService;
import com.atguigu.headline.service.NewsUserService;
import com.atguigu.headline.util.MD5Util;

public class NewsUserServiceImpl implements NewsUserService {
    private NewsUserDao newsUserDao =new NewsUserDaoImpl();

    @Override
    public NewsUser findByUid(Integer uid) {
        return newsUserDao.findByUid(uid);
    }
}

• NewUserDao

package com.atguigu.headline.dao;

import com.atguigu.headline.pojo.NewsUser;


public interface NewsUserDao {
    /**
     * 根据用户id连接数据库查询用户信息
     * @param uid  要查询的用户id
     * @return 找到返回NewsUser对象,找不到返回null
     */
    NewsUser findByUid(Integer uid);
}

• NewUserDaoImpl

package com.atguigu.headline.dao.impl;

import com.atguigu.headline.dao.BaseDao;
import com.atguigu.headline.dao.NewsUserDao;
import com.atguigu.headline.pojo.NewsUser;
import java.util.List;

public class NewsUserDaoImpl extends BaseDao implements NewsUserDao {
    @Override
    public NewsUser findByUid(Integer uid) {
        String sql ="select uid,username,user_pwd userPwd ,nick_name nickName from news_user where uid = ?";
        List<NewsUser> newsUserList = baseQuery(NewsUser.class, sql, uid);
        if (null != newsUserList && newsUserList.size()>0){
            return  newsUserList.get(0);
        }
        return null;
    }
}

3.1.3 注册时用户名占用校验

需求说明

• 用户在注册时输入用户名时,立刻将用户名发送给后端,后端根据用户名查询用户名是否可用并做出响应

uri:

user/checkUserName

请求方式:

POST

请求参数

username=zhangsan

响应示例

• 用户名校验通过

{
    "code":"200",
 "message":"success"
 "data":{}
}

• 用户名占用

{
    "code":"505",
 "message":"用户名占用"
 "data":{}
}

后端代码

• NewsUserController

package com.atguigu.headline.controller;

import com.atguigu.headline.common.Result;
import com.atguigu.headline.common.ResultCodeEnum;
import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.NewsUser;
import com.atguigu.headline.service.NewsUserService;
import com.atguigu.headline.service.impl.NewsUserServiceImpl;
import com.atguigu.headline.util.JwtHelper;
import com.atguigu.headline.util.MD5Util;
import com.atguigu.headline.util.WebUtil;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;


@WebServlet("/user/*")
public class NewsUserController extends BaseController{

    private NewsUserService newsUserService =new NewsUserServiceImpl();
    /**
     * 注册时校验用户名是否被占用
     * @param req
     * @param resp
     * @throws ServletException
     * @throws IOException
     */
    protected void checkUserName(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String username = req.getParameter("username");
        NewsUser newsUser = newsUserService.findByUserName(username);
        Result result=null;
        if (null == newsUser){
            result=Result.ok(null);
        }else{
            result=Result.build(null,ResultCodeEnum.USERNAME_USED);
        }
        WebUtil.writeJson(resp,result);
    }
}

3.1.4 注册表单提交

需求说明

• 客户端将新用户信息发送给服务端,服务端将新用户存入数据库,存入之前做用户名是否被占用校验,校验通过响应成功提示,否则响应失败提示

uri:

user/regist

请求方式:

POST

请求参数

{
    "username":"zhangsan",
    "userPwd":"123456",
    "nickName":"张三"
}

响应示例

• 注册成功

{
    "code":"200",
 "message":"success"
 "data":{}
}

• 用户名占用

{
    "code":"505",
 "message":"用户名占用"
 "data":{}
}

后端代码

• NewsUserController

package com.atguigu.headline.controller;

import com.atguigu.headline.common.Result;
import com.atguigu.headline.common.ResultCodeEnum;
import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.NewsUser;
import com.atguigu.headline.service.NewsUserService;
import com.atguigu.headline.service.impl.NewsUserServiceImpl;
import com.atguigu.headline.util.JwtHelper;
import com.atguigu.headline.util.MD5Util;
import com.atguigu.headline.util.WebUtil;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;


@WebServlet("/user/*")
public class NewsUserController extends BaseController{

    private NewsUserService newsUserService =new NewsUserServiceImpl();

    /**
     * 注册功能接口
     * @param req
     * @param resp
     * @throws ServletException
     * @throws IOException
     */
    protected void regist(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        NewsUser newsUser = WebUtil.readJson(req, NewsUser.class);
        NewsUser usedUser = newsUserService.findByUserName(newsUser.getUsername());
        Result result=null;
        if (null == usedUser){
            newsUserService.registUser(newsUser);
            result=Result.ok(null);
        }else{
            result=Result.build(null,ResultCodeEnum.USERNAME_USED);
        }
        WebUtil.writeJson(resp,result);
    }
}

• NewsUserService

package com.atguigu.headline.service;

import com.atguigu.headline.pojo.NewsUser;

public interface NewsUserService {

    /**
     * 注册用户信息,注册成功返回大于0的整数,失败返回0
     * @param newsUser
     * @return
     */
    int registUser(NewsUser newsUser);
}

• NewsUserServiceImpl

package com.atguigu.headline.service.impl;

import com.atguigu.headline.dao.NewsUserDao;
import com.atguigu.headline.dao.impl.NewsUserDaoImpl;
import com.atguigu.headline.pojo.NewsUser;
import com.atguigu.headline.service.NewsTypeService;
import com.atguigu.headline.service.NewsUserService;
import com.atguigu.headline.util.MD5Util;

public class NewsUserServiceImpl implements NewsUserService {
    @Override
    public int registUser(NewsUser newsUser) {
        // 密码明文转密文
        newsUser.setUserPwd(MD5Util.encrypt(newsUser.getUserPwd()));
        // 存入数据库
        return newsUserDao.insertNewsUser(newsUser);
    }
}

• NewUserDao

package com.atguigu.headline.dao;

import com.atguigu.headline.pojo.NewsUser;


public interface NewsUserDao {
    /**
     * 将用户信息存入数据库
     * @param newsUser 
     * @return
     */
    int insertNewsUser(NewsUser newsUser);
}

• NewUserDaoImpl

package com.atguigu.headline.dao.impl;

import com.atguigu.headline.dao.BaseDao;
import com.atguigu.headline.dao.NewsUserDao;
import com.atguigu.headline.pojo.NewsUser;
import java.util.List;

public class NewsUserDaoImpl extends BaseDao implements NewsUserDao {
    @Override
    public int insertNewsUser(NewsUser newsUser) {
        String sql ="insert into news_user values(DEFAULT,?,?,?)";
        return baseUpdate(sql,newsUser.getUsername(),newsUser.getUserPwd(),newsUser.getNickName());
    }
}

3.2 头条首页功能

3.2.1 查询所有头条分类

需求说明

• 进入新闻首页,查询所有分类并动态展示新闻类别栏位

uri:

portal/findAllTypes

请求方式

GET

请求参数

无

响应示例

{
    "code":"200",
 "message":"OK"
 "data":
            [
                {
                    "tid":"1",
                    "tname":"新闻"
                },
                {
                    "tid":"2",
                    "tname":"体育"
                },
                {
                    "tid":"3",
                    "tname":"娱乐"
                },
                {
                    "tid":"4",
                    "tname":"科技"
                },
                {
                    "tid":"5",
                    "tname":"其他"
                }
            ]
    
}

后端代码

• PortalController

package com.atguigu.headline.controller;

import com.atguigu.headline.common.Result;
import com.atguigu.headline.pojo.NewsType;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;
import com.atguigu.headline.service.NewsHeadlineService;
import com.atguigu.headline.service.NewsTypeService;
import com.atguigu.headline.service.impl.NewsHeadlineServiceImpl;
import com.atguigu.headline.service.impl.NewsTypeServiceImpl;
import com.atguigu.headline.util.WebUtil;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@WebServlet("/portal/*")
public class PortalController extends BaseController{

    private NewsHeadlineService headlineService=new NewsHeadlineServiceImpl();
    private NewsTypeService newsTypeService=new NewsTypeServiceImpl();
    /**
     * 查询所有新闻类型
     * @param req
     * @param resp
     * @throws ServletException
     * @throws IOException
     */
    protected void findAllTypes(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        List<NewsType> newsTypeList =newsTypeService.findAll();
        WebUtil.writeJson(resp,Result.ok(newsTypeList));
    }
}

• NewsTypeService

package com.atguigu.headline.service;

import com.atguigu.headline.pojo.NewsType;

import java.util.List;

public interface NewsTypeService {
    /**
     * 查询全部新闻类型
     * @return
     */
    List<NewsType> findAll();
}

• NewsTypeServiceImpl

package com.atguigu.headline.service.impl;

import com.atguigu.headline.dao.NewsTypeDao;
import com.atguigu.headline.dao.impl.NewsTypeDaoImpl;
import com.atguigu.headline.pojo.NewsType;
import com.atguigu.headline.service.NewsTypeService;

import java.util.List;

public class NewsTypeServiceImpl implements NewsTypeService {
    private NewsTypeDao  newsTypeDao =new NewsTypeDaoImpl();
    @Override
    public List<NewsType> findAll() {
        return newsTypeDao.findAll();
    }
}

• NewUserDao

package com.atguigu.headline.dao;

import com.atguigu.headline.pojo.NewsType;

import java.util.List;

public interface NewsTypeDao {
    /**
     * 从数据库中查询全部新闻类型
     * @return
     */
    List<NewsType> findAll();
}

• NewsTypeDaoImpl

package com.atguigu.headline.dao.impl;

import com.atguigu.headline.dao.BaseDao;
import com.atguigu.headline.dao.NewsTypeDao;
import com.atguigu.headline.pojo.NewsType;

import java.util.List;

public class NewsTypeDaoImpl extends BaseDao implements NewsTypeDao {
    @Override
    public List<NewsType> findAll() {
        String sql ="select tid,tname from news_type";
        return  baseQuery(NewsType.class, sql);
    }
}

3.2.2 分页带条件查询所有头条

需求说明

• 客户端向服务端发送查询关键字,新闻类别,页码数,页大小
• 服务端根据条件搜索分页信息,返回含页码数,页大小,总页数,总记录数,当前页数据等信息,并根据时间降序,浏览量降序排序

uri:

portal/findNewsPage

请求方式:

POST

请求参数:

{
    "keyWords":"马斯克", // 搜索标题关键字
    "type":0,           // 新闻类型
    "pageNum":1,        // 页码数
    "pageSize":"10"     // 页大小
}

响应示例:

{
    "code":"200",
 "message":"success"
 "data":{
    "pageInfo":{
    "pageData":[                           // 本页的数据
    {
    "hid":"1",                     // 新闻id 
    "title":"尚硅谷宣布 ... ...",   // 新闻标题
    "type":"1",                    // 新闻所属类别编号
    "pageViews":"40",              // 新闻浏览量
    "pastHours":"3" ,              // 发布时间已过小时数
    "publisher":"1"                // 发布用户ID
},
{
    "hid":"1",                     // 新闻id 
    "title":"尚硅谷宣布 ... ...",   // 新闻标题
    "type":"1",                    // 新闻所属类别编号
    "pageViews":"40",              // 新闻浏览量
    "pastHours":"3",              // 发布时间已过小时数
    "publisher":"1"                // 发布用户ID
},
{
    "hid":"1",                     // 新闻id 
    "title":"尚硅谷宣布 ... ...",   // 新闻标题
    "type":"1",                    // 新闻所属类别编号
    "pageViews":"40",              // 新闻浏览量
    "pastHours":"3",               // 发布时间已过小时数
    "publisher":"1"                // 发布用户ID
}
    ],
"pageNum":1,    //页码数
"pageSize":10,  // 页大小
"totalPage":20, // 总页数
"totalSize":200 // 总记录数
}
}
}

后端代码

• PortalController

package com.atguigu.headline.controller;

import com.atguigu.headline.common.Result;
import com.atguigu.headline.pojo.NewsType;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;
import com.atguigu.headline.service.NewsHeadlineService;
import com.atguigu.headline.service.NewsTypeService;
import com.atguigu.headline.service.impl.NewsHeadlineServiceImpl;
import com.atguigu.headline.service.impl.NewsTypeServiceImpl;
import com.atguigu.headline.util.WebUtil;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@WebServlet("/portal/*")
public class PortalController extends BaseController{

    private NewsHeadlineService headlineService=new NewsHeadlineServiceImpl();
    private NewsTypeService newsTypeService=new NewsTypeServiceImpl();
    /**
     * 分页带条件查询新闻
     * @param req
     * @param resp
     * @throws ServletException
     * @throws IOException
     */
    protected void findNewsPage(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        HeadlineQueryVo headLineQueryVo = WebUtil.readJson(req, HeadlineQueryVo.class);
        // 查询分页五项数据
        Map<String,Object> pageInfo =headlineService.findPage(headLineQueryVo);
        // 将分页五项数据放入PageInfoMap
        Map<String,Object> pageInfoMap=new HashMap<>();
        pageInfoMap.put("pageInfo",pageInfo);
        // 响应JSON
        WebUtil.writeJson(resp, Result.ok(pageInfoMap));
    }
}

• NewsHeadlineService

package com.atguigu.headline.service;

import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;

import java.util.List;
import java.util.Map;

public interface NewsHeadlineService {
    /**
     * 分页查询头条新闻方法
     * @param headLineQueryVo
     * @return
     */
    Map<String, Object> findPage(HeadlineQueryVo headLineQueryVo);
}

• NewsHeadlineServiceImpl

package com.atguigu.headline.service.impl;

import com.atguigu.headline.dao.NewsHeadLineDao;
import com.atguigu.headline.dao.impl.NewsHeadlineDaoImpl;
import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlinePageVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;
import com.atguigu.headline.service.NewsHeadlineService;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class NewsHeadlineServiceImpl  implements NewsHeadlineService {
    private NewsHeadLineDao newsHeadLineDao =new NewsHeadlineDaoImpl();

    @Override
    public Map<String, Object> findPage(HeadlineQueryVo headLineQueryVo) {
        // 准备一个map,用于装分页的五项数据
        Map<String,Object> pageInfo =new HashMap<>();
        // 分页查询本页数据
        List<HeadlinePageVo>  pageData =newsHeadLineDao.findPageList(headLineQueryVo);
        // 分页查询满足记录的总数据量
        int totalSize = newsHeadLineDao.findPageCount(headLineQueryVo);
        // 页大小
        int pageSize =headLineQueryVo.getPageSize();
        // 总页码数
        int totalPage=totalSize%pageSize == 0 ?  totalSize/pageSize  : totalSize/pageSize+1;
        // 当前页码数
        int pageNum= headLineQueryVo.getPageNum();
        pageInfo.put("pageData",pageData);
        pageInfo.put("pageNum",pageNum);
        pageInfo.put("pageSize",pageSize);
        pageInfo.put("totalPage",totalPage);
        pageInfo.put("totalSize",totalSize);


        return pageInfo;
    }
}

• NewsHeadLineDao

package com.atguigu.headline.dao;

import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlinePageVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;

import java.util.List;

public interface NewsHeadLineDao {
    /**
     * 根据查询条件,查询满足条件的记录数
     * @param headLineQueryVo
     * @return
     */
    int findPageCount(HeadlineQueryVo headLineQueryVo);

    /**
     * 根据查询条件,查询当前页数据
     * @param headLineQueryVo
     * @return
     */
    List<HeadlinePageVo> findPageList(HeadlineQueryVo headLineQueryVo);
}

• NewsHeadlineDaoImpl

package com.atguigu.headline.dao.impl;

import com.atguigu.headline.dao.BaseDao;
import com.atguigu.headline.dao.NewsHeadLineDao;
import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlinePageVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;

import java.util.LinkedList;
import java.util.List;

public class NewsHeadlineDaoImpl extends BaseDao implements NewsHeadLineDao{

    @Override
    public int findPageCount(HeadlineQueryVo headLineQueryVo) {
        //  拼接动态 SQL,拼接参数
        List<Object> args =new LinkedList<>();
        String  sql="select count(1) from news_headline where is_deleted=0 ";
        StringBuilder sqlBuffer =new StringBuilder(sql) ;
        String keyWords = headLineQueryVo.getKeyWords();
        //判断并动态拼接条件
        if (null != keyWords && keyWords.length()>0){
            sqlBuffer.append("and title like ? ");
            args.add("%"+keyWords+"%");
        }
        //  判断并动态拼接条件
        Integer type = headLineQueryVo.getType();
        if(null != type  && type != 0){
            sqlBuffer.append("and type  =  ? ");
            args.add(type);
        }

        // 参数转数组
        Object[] argsArr = args.toArray();
        System.out.println(sqlBuffer.toString());
        Long totalSize = baseQueryObject(Long.class, sqlBuffer.toString(), argsArr);
        // 返回数据
        return totalSize.intValue();
    }

    @Override
    public List<HeadlinePageVo> findPageList(HeadlineQueryVo headLineQueryVo) {
        //  拼接动态 SQL,拼接参数
        List<Object> args =new LinkedList<>();
        String  sql="select hid,title,type,page_views pageViews,TIMESTAMPDIFF(HOUR,create_time,NOW()) pastHours,publisher from news_headline where is_deleted=0 ";
        StringBuilder sqlBuffer =new StringBuilder(sql) ;
        String keyWords = headLineQueryVo.getKeyWords();
        if (null != keyWords && keyWords.length()>0){
            sqlBuffer.append("and title like ? ");
            args.add("%"+keyWords+"%");
        }
        Integer type = headLineQueryVo.getType();
        if(null != type  && type != 0){
            sqlBuffer.append("and type  =  ? ");
            args.add(type);
        }

        sqlBuffer.append("order by pastHours , page_views desc ");
        sqlBuffer.append("limit ? , ?");
        args.add((headLineQueryVo.getPageNum()-1)*headLineQueryVo.getPageSize());
        args.add(headLineQueryVo.getPageSize());

        // 参数转数组
        Object[] argsArr = args.toArray();
        System.out.println(sqlBuffer.toString());
        List<HeadlinePageVo> pageData = baseQuery(HeadlinePageVo.class, sqlBuffer.toString(), argsArr);

        return pageData;
    }
}

3.2.3 查看头条详情

需求说明

• 用户点击"查看全文"时,向服务端发送新闻id
• 后端根据新闻id查询完整新闻文章信息并返回
• 后端要同时让新闻的浏览量+1

uri

portal/showHeadlineDetail

请求方式

POST

请求参数

hid=1

响应示例

{
    "code":"200",
    "message":"success",
    "data":{
        "headline":{
            "hid":"1",                     // 新闻id 
            "title":"马斯克宣布 ... ...",   // 新闻标题
            "article":"... ..."            // 新闻正文
            "type":"1",                    // 新闻所属类别编号
            "typeName":"科技",             // 新闻所属类别
            "pageViews":"40",              // 新闻浏览量
            "pastHours":"3" ,              // 发布时间已过小时数
            "publisher":"1" ,               // 发布用户ID
            "author":"张三"                 // 新闻作者
        }
    }
}

后端代码

• PortalController

package com.atguigu.headline.controller;

import com.atguigu.headline.common.Result;
import com.atguigu.headline.pojo.NewsType;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;
import com.atguigu.headline.service.NewsHeadlineService;
import com.atguigu.headline.service.NewsTypeService;
import com.atguigu.headline.service.impl.NewsHeadlineServiceImpl;
import com.atguigu.headline.service.impl.NewsTypeServiceImpl;
import com.atguigu.headline.util.WebUtil;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@WebServlet("/portal/*")
public class PortalController extends BaseController{

    private NewsHeadlineService headlineService=new NewsHeadlineServiceImpl();
    private NewsTypeService newsTypeService=new NewsTypeServiceImpl();
    /**
     * 查询单个新闻详情
     * @param req
     * @param resp
     * @throws ServletException
     * @throws IOException
     */
    protected void showHeadlineDetail(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        // 获取要查询的详情新闻id
        Integer hid =Integer.parseInt(req.getParameter("hid"));
        
        // 查询新闻详情vo
        HeadlineDetailVo headlineDetailVo =headlineService.findHeadlineDetail(hid);
        // 封装data内容
        Map<String ,Object> data =new HashMap<>();
        data.put("headline",headlineDetailVo);
        // 响应JSON
        WebUtil.writeJson(resp,Result.ok(data));
    }
}

• NewsHeadlineService

package com.atguigu.headline.service;

import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;

import java.util.List;
import java.util.Map;

public interface NewsHeadlineService {
    /**
     * 根据头条id,显示头条详情
     * @param hid
     * @return
     */
    HeadlineDetailVo findHeadlineDetail(Integer hid);
}

• NewsHeadlineServiceImpl

package com.atguigu.headline.service.impl;

import com.atguigu.headline.dao.NewsHeadLineDao;
import com.atguigu.headline.dao.impl.NewsHeadlineDaoImpl;
import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlinePageVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;
import com.atguigu.headline.service.NewsHeadlineService;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class NewsHeadlineServiceImpl  implements NewsHeadlineService {
    private NewsHeadLineDao newsHeadLineDao =new NewsHeadlineDaoImpl();
    @Override
    public HeadlineDetailVo findHeadlineDetail(Integer hid) {
        // 修改新闻信息浏览量+1
        newsHeadLineDao.increasePageViews(hid);
        // 查询新闻详情
        return newsHeadLineDao.findHeadlineDetail(hid);
    }
}

• NewsHeadLineDao

package com.atguigu.headline.dao;

import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlinePageVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;

import java.util.List;

public interface NewsHeadLineDao {
    /**
     * 多表查询新闻详情
     * @param hid
     * @return
     */
    HeadlineDetailVo findHeadlineDetail(Integer hid);
    
    int increasePageViews(Integer hid);
}

• NewsHeadlineDaoImpl

package com.atguigu.headline.dao.impl;

import com.atguigu.headline.dao.BaseDao;
import com.atguigu.headline.dao.NewsHeadLineDao;
import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlinePageVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;

import java.util.LinkedList;
import java.util.List;

public class NewsHeadlineDaoImpl extends BaseDao implements NewsHeadLineDao{
    @Override
    public HeadlineDetailVo findHeadlineDetail(Integer hid) {
        String sql ="select hid,title,article,type, tname typeName ,page_views pageViews,TIMESTAMPDIFF(HOUR,create_time,NOW()) pastHours,publisher,nick_name author from news_headline h left join  news_type t on h.type = t.tid left join news_user u  on h.publisher = u.uid where hid = ?";
        List<HeadlineDetailVo> headlineDetailVoList = baseQuery(HeadlineDetailVo.class, sql, hid);
        if(null != headlineDetailVoList && headlineDetailVoList.size()>0)
            return headlineDetailVoList.get(0);
        return null;
    }
    
    @Override
    public int increasePageViews(Integer hid) {
        String sql ="update news_headline set page_views = page_views +1 where hid =?";
        return baseUpdate(sql,hid);
    }
}

3.3 头条发布修改和删除

3.3.1 登录校验

需求说明

• 客户端在进入发布页前、发布新闻前、进入修改页前、修改前、删除新闻前先向服务端发送请求携带token请求头
• 后端接收token请求头后,校验用户登录是否过期并做响应
• 前端根据响应信息提示用户进入登录页还是进入正常业务页面

uri

user/checkLogin

请求方式

GET

请求参数

无

请求头

token: ... ...

响应示例

• 登录未过期

{
    "code":"200",
    "message":"success",
    "data":{}
}

• 登录已过期

{
    "code":"504",
    "message":"loginExpired",
    "data":{}
}

后端代码

• NewsUserController

package com.atguigu.headline.controller;

import com.atguigu.headline.common.Result;
import com.atguigu.headline.common.ResultCodeEnum;
import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.NewsUser;
import com.atguigu.headline.service.NewsUserService;
import com.atguigu.headline.service.impl.NewsUserServiceImpl;
import com.atguigu.headline.util.JwtHelper;
import com.atguigu.headline.util.MD5Util;
import com.atguigu.headline.util.WebUtil;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;


@WebServlet("/user/*")
public class NewsUserController extends BaseController{

    private NewsUserService newsUserService =new NewsUserServiceImpl();
    /**
     * 通过token检验用户登录是否过期
     * @param req
     * @param resp
     * @throws ServletException
     * @throws IOException
     */
    protected void checkLogin(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String token = req.getHeader("token");
        Result  result =Result.build(null,ResultCodeEnum.NOTLOGIN);
        if(null!= token){
            if (!JwtHelper.isExpiration(token)) {
                result=Result.ok(null);
            }
        }
        WebUtil.writeJson(resp,result);
    }
}

• 登录校验过滤器

package com.atguigu.headline.filters;

import com.atguigu.headline.common.Result;
import com.atguigu.headline.common.ResultCodeEnum;
import com.atguigu.headline.util.JwtHelper;
import com.atguigu.headline.util.WebUtil;
import jakarta.servlet.*;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import java.io.IOException;

public class LoginFilter implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request =(HttpServletRequest)  servletRequest;
        String token = request.getHeader("token");
        boolean flag =false;
        // token不为空并且没过期
        if (null  != token ){
            boolean expiration = JwtHelper.isExpiration(token);
            if (!expiration ){
               flag=true;
            }
        }
        if (flag){
            filterChain.doFilter(servletRequest,servletResponse);
        }else{
            WebUtil.writeJson((HttpServletResponse) servletResponse, Result.build(null, ResultCodeEnum.NOTLOGIN));
        }
    }
}

• web.xml中配置登录校验过滤器

    <!--登录校验过滤器-->
    <filter>
        <filter-name>loginFilter</filter-name>
        <filter-class>com.atguigu.headline.filters.LoginFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>loginFilter</filter-name>
        <url-pattern>/headline/*</url-pattern>
    </filter-mapping>

3.3.2 提交发布头条

需求说明

• 用户在客户端输入发布的新闻信息完毕后
• 发布前先请求后端的登录校验接口验证登录
• 登录通过则提交新闻信息
• 后端将新闻信息存入数据库

uri

headline/publish

请求方式

POST

请求头

token: ... ...

请求参数

{
    "title":"尚硅谷宣布 ... ...",   // 文章标题
    "article":"... ...",          // 文章内容
    "type":"1"                    // 文章类别
}

响应示例

• 发布成功

{
    "code":"200",
    "message":"success",
    "data":{}
}

• 失去登录状态发布失败

{
    "code":"504",
    "message":"loginExpired",
    "data":{}
}

后端代码

• NewsHeadlineController

package com.atguigu.headline.controller;


import com.atguigu.headline.common.Result;
import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.service.NewsHeadlineService;
import com.atguigu.headline.service.impl.NewsHeadlineServiceImpl;
import com.atguigu.headline.util.JwtHelper;
import com.atguigu.headline.util.WebUtil;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

@WebServlet("/headline/*")
public class NewsHeadlineController extends BaseController {

    private NewsHeadlineService newsHeadlineService =new NewsHeadlineServiceImpl();
    /**
     * 发布新闻
     * @param req
     * @param resp
     * @throws ServletException
     * @throws IOException
     */
    protected void publish(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        // 读取新闻信息
        NewsHeadline newsHeadline = WebUtil.readJson(req, NewsHeadline.class);
        // 通过token获取发布者ID
        String token = req.getHeader("token");
        Long userId = JwtHelper.getUserId(token);
        newsHeadline.setPublisher(userId.intValue());
        // 将新闻存入数据库
        newsHeadlineService.addNewsHeadline(newsHeadline);
        WebUtil.writeJson(resp,Result.ok(null));
    }
}

• NewsHeadlineService

package com.atguigu.headline.service;

import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;

import java.util.List;
import java.util.Map;

public interface NewsHeadlineService {
    /**
     * 新增头条
     * @param newsHeadline
     * @return
     */
    int addNewsHeadline(NewsHeadline newsHeadline);
}

• NewsHeadlineServiceImpl

package com.atguigu.headline.service.impl;

import com.atguigu.headline.dao.NewsHeadLineDao;
import com.atguigu.headline.dao.impl.NewsHeadlineDaoImpl;
import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlinePageVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;
import com.atguigu.headline.service.NewsHeadlineService;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class NewsHeadlineServiceImpl  implements NewsHeadlineService {
    private NewsHeadLineDao newsHeadLineDao =new NewsHeadlineDaoImpl();
    public int addNewsHeadline(NewsHeadline newsHeadline) {
        return newsHeadLineDao.addNewsHeadline(newsHeadline);
    }
}

• NewsHeadLineDao

package com.atguigu.headline.dao;

import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlinePageVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;

import java.util.List;

public interface NewsHeadLineDao {
    /**
     * 头条存入数据库
     * @param newsHeadline
     * @return
     */
    int addNewsHeadline(NewsHeadline newsHeadline);
}

• NewsHeadlineDaoImpl

package com.atguigu.headline.dao.impl;

import com.atguigu.headline.dao.BaseDao;
import com.atguigu.headline.dao.NewsHeadLineDao;
import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlinePageVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;

import java.util.LinkedList;
import java.util.List;

public class NewsHeadlineDaoImpl extends BaseDao implements NewsHeadLineDao{
    @Override
    public int addNewsHeadline(NewsHeadline newsHeadline) {
        String sql = "insert into news_headline values(DEFAULT,?,?,?,?,0,NOW(),NOW(),0)";

        return baseUpdate(
                sql,
                newsHeadline.getTitle(),
                newsHeadline.getArticle(),
                newsHeadline.getType(),
                newsHeadline.getPublisher()
        );
    }
}

3.3.3 修改头条回显

需求说明

• 前端先调用登录校验接口,校验登录是否过期
• 登录校验通过后 ,则根据新闻id查询新闻的完整信息并响应给前端

uri

headline/findHeadlineByHid

请求方式

POST

请求参数

hid=1

响应示例

• 查询成功

{
    "code":"200",
    "message":"success",
    "data":{
        "headline":{
            "hid":"1",
            "title":"马斯克宣布",
            "article":"... ... ",
            "type":"2"
        }
    }
}

后端代码

• NewsHeadlineController

package com.atguigu.headline.controller;


import com.atguigu.headline.common.Result;
import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.service.NewsHeadlineService;
import com.atguigu.headline.service.impl.NewsHeadlineServiceImpl;
import com.atguigu.headline.util.JwtHelper;
import com.atguigu.headline.util.WebUtil;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

@WebServlet("/headline/*")
public class NewsHeadlineController extends BaseController {
    private NewsHeadlineService newsHeadlineService =new NewsHeadlineServiceImpl();
    /**
     * 修改新闻回显
     * @param req
     * @param resp
     * @throws ServletException
     * @throws IOException
     */
    protected void findHeadlineByHid(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        Integer hid = Integer.parseInt(req.getParameter("hid"));
        NewsHeadline newsHeadline =newsHeadlineService.findHeadlineByHid(hid);
        Map<String ,Object> data =new HashMap<>();
        data.put("headline",newsHeadline);
        WebUtil.writeJson(resp,Result.ok(data));

    }
}

• NewsHeadlineService

package com.atguigu.headline.service;

import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;

import java.util.List;
import java.util.Map;

public interface NewsHeadlineService {
    /**
     * 根据新闻id查询单个新闻
     * @param hid
     * @return
     */
    NewsHeadline findHeadlineByHid(Integer hid);
}

• NewsHeadlineServiceImpl

package com.atguigu.headline.service.impl;

import com.atguigu.headline.dao.NewsHeadLineDao;
import com.atguigu.headline.dao.impl.NewsHeadlineDaoImpl;
import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlinePageVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;
import com.atguigu.headline.service.NewsHeadlineService;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class NewsHeadlineServiceImpl  implements NewsHeadlineService {
    private NewsHeadLineDao newsHeadLineDao =new NewsHeadlineDaoImpl();
    @Override
    public NewsHeadline findHeadlineByHid(Integer hid) {
        return newsHeadLineDao.findHeadlineByHid(hid);
    }
}

• NewsHeadLineDao

package com.atguigu.headline.dao;

import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlinePageVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;

import java.util.List;

public interface NewsHeadLineDao {
    NewsHeadline findHeadlineByHid(Integer hid);
}

• NewUserDaoImpl

package com.atguigu.headline.dao.impl;

import com.atguigu.headline.dao.BaseDao;
import com.atguigu.headline.dao.NewsHeadLineDao;
import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlinePageVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;

import java.util.LinkedList;
import java.util.List;

public class NewsHeadlineDaoImpl extends BaseDao implements NewsHeadLineDao{
    
    @Override
    public NewsHeadline findHeadlineByHid(Integer hid) {
        String sql ="select hid,title,article,type,publisher,page_views pageViews from news_headline where hid =?";
        List<NewsHeadline> newsHeadlineList = baseQuery(NewsHeadline.class, sql, hid);
        if(null != newsHeadlineList && newsHeadlineList.size()>0)
            return newsHeadlineList.get(0);
        return null;
    }
}

3.3.4 保存修改

需求描述

• 客户端将新闻信息修改后,提交前先请求登录校验接口校验登录状态
• 登录校验通过则提交修改后的新闻信息,后端接收并更新进入数据库

uri

headline/update

请求方式

POST

请求参数

{
    "hid":"1",
    "title":"尚硅谷宣布 ... ...",
    "article":"... ...",
    "type":"2"
}

响应示例

• 修改成功

{
    "code":"200",
    "message":"success",
    "data":{}
}

• 修改失败

{
    "code":"504",
    "message":"loginExpired",
    "data":{}
}

后端代码

• NewsHeadlineController

package com.atguigu.headline.controller;


import com.atguigu.headline.common.Result;
import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.service.NewsHeadlineService;
import com.atguigu.headline.service.impl.NewsHeadlineServiceImpl;
import com.atguigu.headline.util.JwtHelper;
import com.atguigu.headline.util.WebUtil;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

@WebServlet("/headline/*")
public class NewsHeadlineController extends BaseController {
    private NewsHeadlineService newsHeadlineService =new NewsHeadlineServiceImpl();
    /**
     * 更新新闻信息
     * @param req
     * @param resp
     * @throws ServletException
     * @throws IOException
     */
    protected void update(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        NewsHeadline newsHeadline = WebUtil.readJson(req, NewsHeadline.class);
        newsHeadlineService.updateNewsHeadline(newsHeadline);
        WebUtil.writeJson(resp,Result.ok(null));
    }
}

• NewsHeadlineService

package com.atguigu.headline.service;

import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;

import java.util.List;
import java.util.Map;

public interface NewsHeadlineService {
    int updateNewsHeadline(NewsHeadline newsHeadline);
}

• NewsHeadlineServiceImpl

package com.atguigu.headline.service.impl;

import com.atguigu.headline.dao.NewsHeadLineDao;
import com.atguigu.headline.dao.impl.NewsHeadlineDaoImpl;
import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlinePageVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;
import com.atguigu.headline.service.NewsHeadlineService;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class NewsHeadlineServiceImpl  implements NewsHeadlineService {
    private NewsHeadLineDao newsHeadLineDao =new NewsHeadlineDaoImpl();
    @Override
    public int updateNewsHeadline(NewsHeadline newsHeadline) {
        return newsHeadLineDao.updateNewsHeadline(newsHeadline);
    }
}

• NewsHeadLineDao

package com.atguigu.headline.dao;

import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlinePageVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;

import java.util.List;

public interface NewsHeadLineDao {
    int updateNewsHeadline(NewsHeadline newsHeadline);
}

• NewUserDaoImpl

package com.atguigu.headline.dao.impl;

import com.atguigu.headline.dao.BaseDao;
import com.atguigu.headline.dao.NewsHeadLineDao;
import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlinePageVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;

import java.util.LinkedList;
import java.util.List;

public class NewsHeadlineDaoImpl extends BaseDao implements NewsHeadLineDao{
    @Override
    public int updateNewsHeadline(NewsHeadline newsHeadline) {
        String sql ="update news_headline set title = ?, article= ? , type =? , update_time = NOW() where hid = ? ";
        return baseUpdate(
                sql,
                newsHeadline.getTitle(),
                newsHeadline.getArticle(),
                newsHeadline.getType(),
                newsHeadline.getHid()
        );
    }
}

3.3.5 删除头条

需求说明

• 将要删除的新闻id发送给服务端
• 服务端校验登录是否过期,未过期则直接删除,过期则响应登录过期信息

uri

headline/removeByHid

请求方式

POST

请求参数

hid=1

响应示例

• 删除成功

{
    "code":"200",
    "message":"success",
    "data":{}
}

• 删除失败

{
    "code":"504",
    "message":"loginExpired",
    "data":{}
    
}

后端代码

• NewsHeadlineController

package com.atguigu.headline.controller;


import com.atguigu.headline.common.Result;
import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.service.NewsHeadlineService;
import com.atguigu.headline.service.impl.NewsHeadlineServiceImpl;
import com.atguigu.headline.util.JwtHelper;
import com.atguigu.headline.util.WebUtil;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

@WebServlet("/headline/*")
public class NewsHeadlineController extends BaseController {
    private NewsHeadlineService newsHeadlineService =new NewsHeadlineServiceImpl();
    /**
     * 删除新闻
     * @param req
     * @param resp
     * @throws ServletException
     * @throws IOException
     */
    protected void removeByHid(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        Integer hid = Integer.parseInt(req.getParameter("hid"));
        newsHeadlineService.removeByHid(hid);
        WebUtil.writeJson(resp,Result.ok(null));
    }
}

• NewsHeadlineService

package com.atguigu.headline.service;

import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;

import java.util.List;
import java.util.Map;

public interface NewsHeadlineService {
    int removeByHid(Integer hid);
}

• NewsHeadlineServiceImpl

package com.atguigu.headline.service.impl;

import com.atguigu.headline.dao.NewsHeadLineDao;
import com.atguigu.headline.dao.impl.NewsHeadlineDaoImpl;
import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlinePageVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;
import com.atguigu.headline.service.NewsHeadlineService;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class NewsHeadlineServiceImpl  implements NewsHeadlineService {
    private NewsHeadLineDao newsHeadLineDao =new NewsHeadlineDaoImpl();
    @Override
    public int removeByHid(Integer hid) {
        return newsHeadLineDao.removeByHid(hid);
    }
}

• NewsHeadLineDao

package com.atguigu.headline.dao;

import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlinePageVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;

import java.util.List;

public interface NewsHeadLineDao {
    int removeByHid(Integer hid);
}

• NewsHeadlineDaoImpl

package com.atguigu.headline.dao.impl;

import com.atguigu.headline.dao.BaseDao;
import com.atguigu.headline.dao.NewsHeadLineDao;
import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlinePageVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;

import java.util.LinkedList;
import java.util.List;

public class NewsHeadlineDaoImpl extends BaseDao implements NewsHeadLineDao{
    @Override
    public int removeByHid(Integer hid) {
        String sql ="update news_headline set is_deleted =1 ,  update_time =NOW() where hid = ? ";
        return baseUpdate(sql,hid);
    }

原文地址：https://blog.csdn.net/Joker15517/article/details/143878374

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