spring-ioc三层架构测试

src/main/java/com.atguigu.pojo/Student.java类

package com.atguigu.pojo;

public class Student {
    private Integer id;
    private String name;
    private String pwd;
    private String plone;
    private String address;

    public Integer getId() { return id; }

    public String getPwd() { return pwd; }

    public void setPwd(String pwd) { this.pwd = pwd; }

    public void setId(Integer id) { this.id = id; }

    public String getName() { return name; }

    public void setName(String name) { this.name = name; }

    public String getPlone() { return plone; }

    public void setPlone(String plone) { this.plone = plone; }

    public String getAddress() { return address; }

    public void setAddress(String address) {
        this.address = address;
    }

    @Override
    public String toString() {
        return "Student{" + "id=" + id + ", name='" + name + '\'' + ", phone=" + plone + ", address='" + address + '\'' + '}';
    }
}

src/main/resources/spring-02.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:comtext="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">

    引入外部配置文件
    <comtext:property-placeholder location="classpath:jdbc.properties"/>

    druid
    类型：com.alibaba.druid.pool.DruidDataSource，表示使用阿里巴巴的Druid连接池作为数据源。
属性：url、driverClassName、username、password，分别表示数据库连接的URL、驱动类、用户名和密码。
作用：用于创建数据库连接池，管理数据库连接的获取和释放，提高数据库操作的性能和效率。
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="url" value="${atguitu.url}"/>
        <property name="driverClassName" value="${atguigu.driver}"/>
        <property name="username" value="${atguigu.username}"/>
        <property name="password" value="${atguigu.password}"/>
    </bean>

    jdbcTemplate
    类型：org.springframework.jdbc.core.JdbcTemplate，是Spring框架提供的用于简化数据库操作的工具类。
属性：dataSource，引用了上面定义的dataSource bean，表示将dataSource注入到jdbcTemplate中，使jdbcTemplate能够使用dataSource管理数据库连接。
作用：简化了数据库操作，提供了一系列执行SQL语句、查询结果映射等功能，避免了手动编写繁琐的JDBC代码，提高了开发效率。
    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dataSource"/>
    </bean>

    dao 配置 jdbcTemplate
    <bean id="studentDao" class="com.atguigu.dao.impl.StudentDaoImpl">
        <property name="jdbcTemplate" ref="jdbcTemplate"/>
    </bean>

    service 配置 dao
    <bean id="studentService" class="com.atguigu.service.Impl.StudentServiceImpl">
        <property name="studentDao" ref="studentDao"/>
    </bean>

    controller 配置 service
    <bean id="studentController" class="com.atguigu.controller.StudentController">
        <property name="studentService" ref="studentService"></property>
    </bean>
</beans>

---

src/main/java/com.atguigu.dao/StudentDao接口

package com.atguigu.dao;

import com.atguigu.pojo.Student;

import java.util.List;

public interface StudentDao {
    // 数据库查询全部数据
    List<Student> queryAll();
}

src/main/java/com.atguigu.dao/impl/StudentDaoImpl.java

package com.atguigu.dao.impl;

import com.atguigu.dao.StudentDao;
import com.atguigu.pojo.Student;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;

import java.util.List;

public class StudentDaoImpl implements StudentDao {
    private JdbcTemplate jdbcTemplate;

    public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
        this.jdbcTemplate = jdbcTemplate;
    }

    @Override
    public List<Student> queryAll(){
        String sql = "select id, name, pwd, plone, address from my_user";
        List<Student> stuList = jdbcTemplate.query(sql, new BeanPropertyRowMapper<>(Student.class));
        System.out.println("stuList= " + stuList);
        return stuList;
    }
}

---

src/main/java/com.atguigu.service/StudentService接口

package com.atguigu.service;

import com.atguigu.pojo.Student;

import java.util.List;

public interface StudentService {
    // 查询所有用户数据业务
    List<Student> findAll();
}

src/main/java/com.atguigu.service/impl/StudentServiceImpl.java

package com.atguigu.service.Impl;

import com.atguigu.dao.StudentDao;
import com.atguigu.pojo.Student;
import com.atguigu.service.StudentService;

import java.util.List;

public class StudentServiceImpl implements StudentService {
    private StudentDao studentDao;

    public void setStudentDao(StudentDao studentDao) {
        this.studentDao = studentDao;
    }

    @Override
    public List<Student> findAll() {
        List<Student> stuList = studentDao.queryAll();
        System.out.println("studentSerice= " + stuList);
        return stuList;
    }
}

---

src/main/java/com.atguigu.controller/StudentController

package com.atguigu.controller;

import com.atguigu.pojo.Student;
import com.atguigu.service.Impl.StudentServiceImpl;
import com.atguigu.service.StudentService;
import org.springframework.jdbc.core.JdbcTemplate;

import java.util.List;

public class StudentController {
    private StudentService studentService;

    public void setStudentService(StudentService studentService) {
        this.studentService = studentService;
    }

    public void findAll(){
        List<Student> all = studentService.findAll();
        System.out.println("最终用户数据= " + all);
    }
}

---

测试方法如下

@Test
public void  testQueryAll(){
// 1、创建Ioc容器
ClassPathXmlApplicationContext applicationContext
= new ClassPathXmlApplicationContext("spring-02.xml");
// 2、获取组件对象
StudentController controller = applicationContext.getBean(StudentController.class);

// 3、使用组件对象
controller.findAll();

// 4、关闭容器
applicationContext.close();
}

原文地址：https://blog.csdn.net/pig_ning/article/details/137456977

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