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;
@Controller
public 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。