首先要匯入相應的架包

<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->
<dependency>
   <groupId>com.fasterxml.jackson.core</groupId>
   <artifactId>jackson-databind</artifactId>
   <version>2.8.7</version>
</dependency>

<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-core -->
<dependency>
   <groupId>com.fasterxml.jackson.core</groupId>
   <artifactId>jackson-core</artifactId>
   <version>2.8.7</version>
</dependency>

<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-annotations -->
<dependency>
   <groupId>com.fasterxml.jackson.core</groupId>
   <artifactId>jackson-annotations</artifactId>
   <version>2.8.7</version>
</dependency>

然後再

<!-- 新增的兩個 自動配置器（restful 風格所必須） -->
<mvc:annotation-driven/>
<mvc:default-servlet-handler/>

以下為前端的相關ajax請求

function sendNews()
{
var url="${pageContext.request.contextPath}/NewsAction/addNews";
var title = "title="+$('#title').val();
var author = "author="+$('#author').val();
var content = "content="+UE.getEditor('container').getContent();

var dataText = title+"&"+author+"&"+content;
alert("dataText:   "+dataText);
$.ajax({
url:url,

dataType:"text",  /* 後端  返回值型別 為  String 時  此處 必須指定  dataType 為 text */ 
data:dataText,

type:"post",
success:function(rspText)
{
alert("哈哈哈哈");
alert("rspText:  "+rspText);
}
});
}

以下為具體的實現類

@RequestMapping(value="addNews",produces="application/json;charset=utf-8")
@ResponseBody
public News   addNews(News news)
{  
System.out.println("--------- 新增  news ---------");
news.setId(UUID.randomUUID().toString());
news.setNewsdate(new Date().toString());
String newsStr = "";
try
{
newsStr = new ObjectMapper().writeValueAsString(news);
System.out.println("newsStr:\t"+newsStr);
}
catch (JsonProcessingException e) {
e.printStackTrace();
}
String a = "{'id':'fae9acde-2808-4153-ae50-c15f7b7b94b6','title':null,'content':null,'newsdate':'Tue Apr 11 12:20:39 CST 2017','author':null}";;

return news;

}

、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、

一、實驗環境的搭建

1、Spring mvc jar。

匯入spring mvc執行所需jar包。匯入如下（有多餘）

2、json的支援jar

3、加入jQuery。

選用jquery-3.0.0.min.js，放在WebRoot/JS資料夾

匯入jQuery到jsp頁面如下

4、web.xml

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">

  <display-name>springmvcjson</display-name>

  <servlet>

  <servlet-name>springmvc</servlet-name>

  <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

  <init-param>

  <param-name>contextConfigLocation</param-name>

  <param-value>classpath:springmvc.xml</param-value>

  </init-param>

  <load-on-startup>1</load-on-startup>

  </servlet>

  <servlet-mapping>

  <servlet-name>springmvc</servlet-name>

  <url-pattern>*.action</url-pattern>

  </servlet-mapping>

  <welcome-file-list>

    <welcome-file>index.html</welcome-file>

    <welcome-file>index.htm</welcome-file>

    <welcome-file>index.jsp</welcome-file>

    <welcome-file>default.html</welcome-file>

    <welcome-file>default.htm</welcome-file>

    <welcome-file>default.jsp</welcome-file>

  </welcome-file-list>

</web-app>

5、springmvc.xml

classpath下

<beans xmlns="http://www.springframework.org/schema/beans"

         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"

         xmlns:context="http://www.springframework.org/schema/context"

         xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"

         xsi:schemaLocation="http://www.springframework.org/schema/beans

                   http://www.springframework.org/schema/beans/spring-beans-3.2.xsd

                   http://www.springframework.org/schema/mvc

                   http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd

                   http://www.springframework.org/schema/context

                   http://www.springframework.org/schema/context/spring-context-3.2.xsd

                   http://www.springframework.org/schema/aop

                   http://www.springframework.org/schema/aop/spring-aop-3.2.xsd

                   http://www.springframework.org/schema/tx

                   http://www.springframework.org/schema/tx/spring-tx-3.2.xsd ">

         <!-- <bean name="/test01.action" class="com.xzw.json.controller.JsonTest"></bean> -->

         <!-- View -->

         <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"></bean>

         <!-- 註解對映和介面卡 -->

         <mvc:annotation-driven ></mvc:annotation-driven>

         <!-- 元件掃描 -->

         <context:component-scan base-package="com.xzw.json.controller"></context:component-scan>

         <!-- 使用@Autowired、@Required等註解

         如不必設定<bean class="org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor "/>和

         <bean class="org.springframework.beans.factory.annotation.RequiredAnnotationBeanPostProcessor"/>等等

         -->

         <context:annotation-config /> 

</beans>

二、實驗例子編寫

1、請求和返回都是JSON

a).程式發起

index.jsp的一個按鈕

b).js函式

function requestByJson() {

         $.ajax({

                   type : 'post',

                   url : '${pageContext.request.contextPath}/jsonsource.action',

                   //設定contentType型別為json

                   contentType : 'application/json;charset=utf-8',

                   //json資料

                   data : '{"username":"reader001","password":"psw001"}',

                   //請求成功後的回撥函式

                   success : function(data) {

                            alert(data.username);

                   }

         });

}

c).Controller/Mapping

@RequestMapping("/jsonsource")

//@RequestBody 將json物件轉成java物件

//@ResponseBody 表示返回的是json物件

public @ResponseBody User jsonSource(@RequestBody User user){

         return user;

}