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。
自定义HttpMessageConverter接受JSON数据
原文地址：https://www.cnblogs.com/guowenrui/p/10363589.html