Spring MVC 处理Ajax请求的方式详解

import org.springframework.web.bind.annotation.*;
@RestController
@RequestMapping("/api")
public class MyController {
    @GetMapping("/data")
    public ResponseEntity<MyData> getData() {
        MyData data = new MyData(); // 创建数据对象
        return ResponseEntity.ok(data); // 返回数据
    }
    @PostMapping("/data")
    public ResponseEntity<String> postData(@RequestBody MyData data) {
        // 处理接收到的数据
        return ResponseEntity.ok("Data received successfully");
    }
}

<!--此时必须使用post请求方式，因为get请求没有请求体-->
<form th:action="@{/test/RequestBody}" method="post">
    用户名：<input type="text" name="username"><br>
    密码：<input type="password" name="password"><br>
    <input type="submit">
</form>

@RequestMapping("/test/RequestBody")
public String testRequestBody(@RequestBody String requestBody){
    System.out.println("requestBody:"+requestBody);
    return "success";
}

/* 方式一
axios({
    method: 'get',  // 请求方式，以name = value & name = value的形式传递参数不管传递的方式是get还是post，请求参数都会被拼接到请求地址后。
          此种方式的请求参数可以通过request.getParameter()获取
    url: ‘', //请求路径，
    params: {
       username: 'admin',  //以这种json方式发送的请求参数，请求参数被放在请求体中，并传输到服务器，这种方式传值，是没法被request.getParameter()获取的
       password: '123456'
       }
}).then(function (response) {
      console.log(response);
      vm.msg = response.data;
    }
*/
/* axios的请求格式
 * 请求方式：
* 1. axios.get()
* 2. axios.post()
* 3. axios.put()
* 4. axios.delete()
* 5. axios.head()
* 6. axios.options()
* 7. axios.patch()
* 8. axios.request()
//方式二
  axios.get("/test/RequestBody").then(function (response) {
      console.log(response);
      vm.msg = response.data;
      });
     },
*/
      /*
      * 请求体的格式
      * 1. 使用url传递参数
      * 2. 使用json传递参数
      */

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.12.1</version>
</dependency>

<!--开启mvc的注解驱动-->
<mvc:annotation-driven />

<input type="button" value="测试@RequestBody获取json格式的请求参数"@click="testRequestBody()">
<script type="text/javascript" th:src="@{/js/vue.js}"></script>
<script type="text/javascript" th:src="@{/js/axios.min.js}"></script>
<script type="text/javascript">
    var vue = new Vue({
        el:"#app",
        methods:{
            testRequestBody(){
                axios.post(
                    "/SpringMVC/test/RequestBody/json",
                    {username:"admin",password:"123456"}
                ).then(response=>{
                    console.log(response.data);
                });
            }
        }
    });
</script>

//将json格式的数据转换为map集合
@RequestMapping("/test/RequestBody/json")
public void testRequestBody(@RequestBody Map<String, Object> map,HttpServletResponse response) throws IOException {
    System.out.println(map);
    //{username=admin, password=123456}
    response.getWriter().print("hello,axios");
}
//将json格式的数据转换为实体类对象
@RequestMapping("/test/RequestBody/json")
public void testRequestBody(@RequestBody User user, HttpServletResponseresponse) throws IOException {
    System.out.println(user);
    //User{id=null, username='admin', password='123456', age=null,gender='null'}
	response.getWriter().print("hello,axios");
}

@RequestMapping("/testResponseBody")
public String testResponseBody(){
    //此时会跳转到逻辑视图success所对应的页面
    return "success";
}
@RequestMapping("/testResponseBody")
@ResponseBody
public String testResponseBody(){
    //此时响应浏览器数据success
    return "success";
}

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.12.1</version>
</dependency>

<!--开启mvc的注解驱动-->
<mvc:annotation-driven />

<input type="button" value="测试@ResponseBody响应浏览器json格式的数据"@click="testResponseBody()"><br>
<script type="text/javascript" th:src="@{/js/vue.js}"></script>
<script type="text/javascript" th:src="@{/js/axios.min.js}"></script>
<script type="text/javascript">
    var vue = new Vue({
        el:"#app",
        methods:{
            testResponseBody(){
                axios.post("/SpringMVC/test/ResponseBody/json").then(response=>{
                    console.log(response.data);
                });
            }
        }
    });
</script>

//响应浏览器list集合
@RequestMapping("/test/ResponseBody/json")
@ResponseBody
public List<User> testResponseBody(){
    User user1 = new User(1001,"admin1","123456",23,"男");
    User user2 = new User(1002,"admin2","123456",23,"男");
    User user3 = new User(1003,"admin3","123456",23,"男");
    List<User> list = Arrays.asList(user1, user2, user3);
    return list;
}
//响应浏览器map集合
@RequestMapping("/test/ResponseBody/json")
@ResponseBody
public Map<String, Object> testResponseBody(){
    User user1 = new User(1001,"admin1","123456",23,"男");
    User user2 = new User(1002,"admin2","123456",23,"男");
    User user3 = new User(1003,"admin3","123456",23,"男");
    Map<String, Object> map = new HashMap<>();
    map.put("1001", user1);
    map.put("1002", user2);
    map.put("1003", user3);
    return map;
}
//响应浏览器实体类对象
@RequestMapping("/test/ResponseBody/json")
@ResponseBody
public User testResponseBody(){
    return user;
}