Spring默认使用Jackson处理json数据。实际开发中，在业界中，使用非常受欢迎的fastjson来接受json数据。

创建一个项目，在web目录下新建一个assets/js目录，加入jquery和json2的js文件，在lib下加入fastjson的jar文件。

BookController

package com.wen.controller;import com.alibaba.fastjson.JSONObject;import com.wen.domain.Book;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestBody;import org.springframework.web.bind.annotation.RequestMapping;import javax.servlet.http.HttpServletResponse;import java.io.IOException;@Controllerpublic class BookController { private static final Log logger = LogFactory.getLog(Book2Controller.class); @RequestMapping(value = "/testRequestBody") public void setJson(@RequestBody Book book, HttpServletResponse response) throws IOException { //使用JsonObject将book对象转换成json输出 logger.info(JSONObject.toJSONString(book)); book.setAuthor("xiaoxiaorui"); response.setContentType("text/html;charset=UTF-8"); //将book对象转换成json写出客户端 response.getWriter().println(JSONObject.toJSONString(book)); }}

配置springmvc-config.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:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd"> <!--spring可以自动去扫描base-pack下面的包或者子包下面的java文件, 如果扫描到有Spring的相关注解的类，则把这些类注册为Spring的bean--> <context:component-scan base-package="com.wen.controller"/> <!--设置默认的Servlet来响应静态文件--> <mvc:default-servlet-handler/> <!--设置配置方案,会自动注册RequestMappingHandlerMapping与RequestMappingHandlerAdapter两个Bean--> <mvc:annotation-driven> <!--设置不使用默认的消息转换器--> <mvc:message-converters register-defaults="false"> <!--配置Spring的转换器--> <bean class="org.springframework.http.converter.StringHttpMessageConverter"/> <bean class="org.springframework.http.converter.xml.XmlAwareFormHttpMessageConverter"/> <bean class="org.springframework.http.converter.ByteArrayHttpMessageConverter"/> <bean class="org.springframework.http.converter.BufferedImageHttpMessageConverter"/> <!--配置fastjson中实现HttpMessageConverter接口的转换器--> <!--FastJsonHttpMessageConverter是fastjson中实现了HttpMessageConverter接口的类--> <bean id="fastJsonHttpMessageConverter" class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter"> <!--加入支持的媒体类型：返回contentType--> <property name="supportedMediaTypes"> <list> <!--这里顺序一定不能写反，不然IE会出现下载提示--> <value>text/html;charset=UTF-8</value> <value>application/json;charset=UTF-8</value> </list> </property> </bean> </mvc:message-converters> </mvc:annotation-driven> <!--视图解析器--> <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <!--前缀--> <property name="prefix" value="/WEB-INF/pages/"/> <!--后缀--> <property name="suffix" value=".jsp"/> </bean></beans>

配置web.xml

<?xml version="1.0" encoding="UTF-8"?><web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" version="4.0"> <context-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/applicationContext.xml</param-value> </context-param> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <!--定义Spring MVC前端控制器--> <servlet> <servlet-name>springmvc</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/springmvc-config.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <!--让Spring MVC的前端控制器拦截所有请求--> <servlet-mapping> <servlet-name>springmvc</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping></web-app>

index.jsp

<%-- Created by IntelliJ IDEA. User: wen Date: 2019/2/10 Time: 12:13 To change this template use File | Settings | File Templates.--%><%@ page contentType="text/html;charset=UTF-8" language="java" %><html><head> <title>测试接受JSON格式的数据</title> <script type="text/javascript" src="assets/js/jquery.js"></script> <script type="text/javascript" src="assets/js/json2.js"></script> <script type="text/javascript"> $(document).ready(function () { testRequestBody(); }) function testRequestBody() { $.ajax({ dataType:"json",//预期服务器返回的数据类型 type:"post",//请求方式post 或 get url:"${pageContext.request.contextPath}/testRequestBody",//发送请求的URL字符串 contentType:"application/json",//发送信息至服务器时的内容编码格式 data:JSON.stringify({id:1,name:"SpringMVC企业应用实战"}), async:true,//默认设置下，所有请求均为异步请求。如果设置为false，则发送同步请求 success:function (data) {//请求成功的回调函数 console.log(data); $("#id").html(data.id); $("#name").html(data.name); $("#author").html(data.author); }, error:function () {//请求出错时调用的函数 alert("数据发送失败") } }); } </script></head><body>编号：<span id="id"></span><br>书名：<span id="name"></span><br>作者：<span id="author"></span><br></body></html>

其实处理json格式的开源类包使用Jackson和fastjson，只是需要使用不同的HttpMessageConverter。