10.SpringBoot(接受参数相关注解)
常用注解
@PathVariable 路径参数获取信息
<a href="/monster/100/king">@PathVariable-路径变量:/monster/100/king</a>
package com.sun.springboot.controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import java.util.Map;
@RestController
public class ParameterController {
@GetMapping("/monster/{id}/{name}") //接受两个路径参数
public String pathVariable(@PathVariable("id") Integer id, @PathVariable("name") String name,
@PathVariable Map<String, String> map) { //这里的map指将所有的路径参数都放到map中
System.out.println("id:" + id + " name:" + name);
for (Map.Entry<String, String> entry : map.entrySet()) {
System.out.println("key:" + entry.getKey() + " value: " + entry.getValue());
}
return "success"; //返回json给浏览器
}
}
@RequestHeader 请求头获取信息
package com.sun.springboot.controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestHeader;
import org.springframework.web.bind.annotation.RestController;
import java.util.Map;
@RestController
public class ParameterController {
@GetMapping("/requestHeader") //获取请求头的信息
public String requestHeader(@RequestHeader("host") String host, @RequestHeader Map<String, String> header) {
System.out.println("host:" + host);
System.out.println(header);
return "success";
}
}
@RequestParameter 请求获取参数信息
<a href="/hi?hobby=打篮球&hobby=踢球">@RequestParam-请求参数</a>
package com.sun.springboot.controller;
import org.springframework.web.bind.annotation.*;
import java.util.List;
@RestController
public class ParameterController {
@GetMapping("/hi")
public String hi(@RequestParam(value = "name", defaultValue = "xxx") String name,
@RequestParam("hobby") List<String> list) {
System.out.println("name:" + name);
System.out.println(list);
return "success";
}
}
@CookieValue cookie获取值
<a href="/cookie">@CookieValue-获取cookie的值</a>
package com.sun.springboot.controller;
import org.springframework.web.bind.annotation.*;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
@RestController
public class ParameterController {
@GetMapping("/cookie")
//这里可以设置required = false意为不是必须存在的,如果不存在则得到的值就为null
//如果后面的参数类型是Cookie,则会获取Cookie对象并封装到变量中
public String cookie(@CookieValue(value = "cookie_key", required = false) String cookie_value,
@CookieValue(value = "username" , required = false) Cookie cookie, HttpServletRequest request) {
//使用原生api获取cookies
Cookie[] cookies = request.getCookies();
for (Cookie cookie1 : cookies) {
System.out.println(cookie1);
}
System.out.println(cookie_value);
System.out.println("name:" + cookie.getName() + " value: " + cookie.getValue());
return "success";
}
}
@RequestBody 处理json请求,post请求体获取信息
<form action="/requestBody" method="post">
<input type="text" name="username"><br>
<input type="text" name="password"><br>
<input type="submit" value="submit">
</form>
@RestController
public class ParameterController {
@PostMapping("requestBody")
public String getRequestBody(@RequestBody String requestBody) { //获取请求体
System.out.println(requestBody);
return "success";
}
}
@RequestAttribute 请求域获取信息
@Controller
public class RequestController {
@GetMapping("/login")
public String login(HttpServletRequest request) {
//在Request域中存放一些信息
request.setAttribute("name", "sun");
request.setAttribute("age", 13);
//调用视图解析器,请求转发到/ok
return "forward:/ok";
}
@ResponseBody
@GetMapping("/ok")
public String ok(@RequestAttribute(value = "name", required = false) String name) { //使用注解来获取请求域中的信息并封装到参数中
System.out.println("name: " + name);
return "success"; //返回json给浏览器
}
}
2.配置视图解析器 application.yml
spring:
mvc:
view: #配置了视图解析器
suffix: .html #后缀
prefix: / #前缀,指的是根目录
@SessionAttribute session域获取信息
@Controller
public class SessionController {
@GetMapping("/login")
public String login(HttpServletRequest request) {
//在session域中设置信息
request.getSession().setAttribute("session", "session_value");
//调用视图解析器,请求转发到/ok
return "forward:/ok";
}
@ResponseBody
@GetMapping("/ok")
public String ok(@SessionAttribute(value = "session") String value) { //使用注解来获取session域中的信息并封装到参数中
System.out.println("session: " + value);
return "success"; //返回json给浏览器
}
}
2.配置视图解析器(同上)
复杂参数处理
@RequestAttribute
package com.sun.springboot.controller;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestAttribute;
import org.springframework.web.bind.annotation.ResponseBody;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
@Controller
public class RequestController {
@GetMapping("/login")
public String login(Map<String, Object> map, Model model, HttpServletResponse response) {
//给map封装信息
map.put("user", "sun");
map.put("job", "工程师");
//model封装信息
model.addAttribute("sal", 1000);
//结果最后都会封装到request域中
//调用视图解析器,请求转发到/ok
return "forward:/ok";
}
@ResponseBody
@GetMapping("/ok")
public String ok(@RequestAttribute("user") String user, @RequestAttribute("job") String job,
@RequestAttribute("sal") Integer sal) { //使用注解来获取请求域中的信息并封装到参数中
System.out.println("user:" + user + " job:" + job + " sal:" +sal);
return "success"; //返回json给浏览器
}
}
@CookieValue
package com.sun.springboot.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CookieValue;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletResponse;
@Controller
public class RequestController {
@GetMapping("/login")
public String login(HttpServletResponse response) {
Cookie cookie = new Cookie("cookie_name", "cookie_value");
response.addCookie(cookie);
//调用视图解析器,重定向到/ok,不能使用请求转发,因为虽然响应给客户端cookie了,
// 但是由于是请求转发,第二个controller得到的是最开始的请求,那时候还没有cookie
return "redirect:/ok";
}
@ResponseBody
@GetMapping("/ok")
public String ok(@CookieValue("cookie_name") Cookie cookie) {
//获取cookie
System.out.println("key:" + cookie.getName() + " value:" + cookie.getValue());
return "success"; //返回json给浏览器
}
}
原文地址:https://blog.csdn.net/qq_44438941/article/details/137666493
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