springMVC中HttpMessageConverter的具体使用

<form th:action="@{/testRequestBody}" method="post">
用户名：<input type="text" name="username"><br>
密码：<input type="password" name="password"><br>
<input type="submit">
</form>

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

<form th:action="@{/testRequestEntity}" method="post">
    用户名：<input type="text" name="username"><br>
    密码：<input type="password" name="password"><br>
    <input type="submit" value="测试RequestEntity">
</form>

@RequestMapping("/testRequestEntity")
public String testRequestEntity(RequestEntity<String> requestEntity){
System.out.println("requestHeader:"+requestEntity.getHeaders());
System.out.println("requestBody:"+requestEntity.getBody());
return "success";
}

<a th:href="@{/testResponseBody}" rel="external nofollow" >通过ResponseBody对象响应浏览器数据</a>

@RequestMapping("/testResponseBody")
@ResponseBody
public String testResponseBody(){
return "success";
}

package com.dragon.mvc.bean;
public class User {
    private Integer id;
    private String username;
    private String password;
    private Integer age;
    private String sex;
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    public Integer getAge() {
        return age;
    }
    public void setAge(Integer age) {
        this.age = age;
    }
    public String getSex() {
        return sex;
    }
    public void setSex(String sex) {
        this.sex = sex;
    }
    public User(Integer id, String username, String password, Integer age, String sex) {
        this.id = id;
        this.username = username;
        this.password = password;
        this.age = age;
        this.sex = sex;
    }
    public User() {
    }
}

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

pom.xml=======================
<mvc:annotation-driven />

@RequestMapping("/testResponseUser")
@ResponseBody
public User testResponseUser(){
return new User(1001,"admin","123456",23,"男");
}

<a th:href="@{/testResponseUser}" rel="external nofollow" >通过ResponseUser对象响应浏览器数据</a>

<div id="app">
<a th:href="@{/testAjax}" rel="external nofollow"  @click="testAjax">testAjax</a><br>
</div>

<script type="text/javascript" th:src="@{/static/js/vue.js}"></script>
<script type="text/javascript" th:src="@{/static/js/axios.min.js}"></script>
<script type="text/javascript">
var vue = new Vue({
el:"#app",
methods:{
testAjax:function (event) {
axios({
method:"post",
url:event.target.href,
params:{
username:"admin",
password:"123456"
}
}).then(function (response) {
alert(response.data);
});
event.preventDefault();
}
}
});
</script>

@RequestMapping("/testAjax")
@ResponseBody
public String testAjax(String username, String password){
System.out.println("username:"+username+",password:"+password);
return "hello,ajax";
}