Spring mvc使用开源的Jackson包来处理JSON格式的请求或相应消息。
index.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%><!DOCTYPE html><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>测试接收JSON格式的数据</title><script type="text/javascript" src="js/jquery-1.11.0.min.js"></script><script type="text/javascript" src="js/json2.js"></script><script type="text/javascript">$(document).ready(function(){testRequestBody();});function testRequestBody(){$.ajax("${pageContext.request.contextPath}/json/testRequestBody",// 发送请求的URL字符串。{dataType : "json", // 预期服务器返回的数据类型。type : "post", // 请求方式 POST或GETcontentType:"application/json", // 发送信息至服务器时的内容编码类型// 发送到服务器的数据。data:JSON.stringify({id : 1, name : "Spring MVC企业应用实战"}),async: true , // 默认设置下，所有请求均为异步请求。如果设置为false，则发送同步请求// 请求成功后的回调函数。success :function(data){console.log(data);$("#id").html(data.id);$("#name").html(data.name);$("#author").html(data.author);},// 请求出错时调用的函数error:function(){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>
BookController.java
package org.zhangxueliang.controller;import javax.servlet.http.HttpServletResponse;import mons.logging.Log;import mons.logging.LogFactory;import org.codehaus.jackson.map.ObjectMapper;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestBody;import org.springframework.web.bind.annotation.RequestMapping;import org.zhangxueliang.domain.Book;@Controller@RequestMapping("/json")public class BookController {private static final Log logger = LogFactory.getLog(BookController.class);// @RequestBody根据json数据，转换成对应的Object@RequestMapping(value="/testRequestBody")public void setJson(@RequestBody Book book,HttpServletResponse response) throws Exception{// ObjectMapper类是Jackson库的主要类。它提供一些功能将Java对象转换成对应的JSON格式的数据ObjectMapper mapper = new ObjectMapper();// 将book对象转换成json输出logger.info(mapper.writeValueAsString(book) );book.setAuthor("张学亮");response.setContentType("text/html;charset=UTF-8");// 将book对象转换成json写出到客户端response.getWriter().println(mapper.writeValueAsString(book));}}
Book.java
package org.zhangxueliang.domain;import java.io.Serializable;public class Book implements Serializable {private Integer id;private String name;private String author;public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getAuthor() {return author;}public void setAuthor(String author) {this.author = author;}@Overridepublic String toString() {return "Book [id=" + id + ", name=" + name + ", author=" + author + "]";}}
springmvc-config.xml
<?xml version="1.0" encoding="UTF-8"?><beans xmlns="/schema/beans"xmlns:xsi="/2001/XMLSchema-instance"xmlns:mvc="/schema/mvc"xmlns:context="/schema/context"xsi:schemaLocation="/schema/beans/schema/beans/spring-beans-4.2.xsd/schema/mvc/schema/mvc/spring-mvc-4.2.xsd/schema/context/schema/context/spring-context-4.2.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="org.zhangxueliang.controller"/><!-- 设置配置方案 --><mvc:annotation-driven/><!-- 使用默认的Servlet来响应静态文件 --><mvc:default-servlet-handler/><!-- 视图解析器 --><bean id="viewResolver"class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <!-- 前缀 --><property name="prefix"><value>/WEB-INF/content/</value></property><!-- 后缀 --><property name="suffix"><value>.jsp</value></property></bean></beans>
web.xml
<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="/2001/XMLSchema-instance" xmlns="/xml/ns/javaee" xsi:schemaLocation="/xml/ns/javaee /xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1"><!-- 定义Spring MVC的前端控制器 --><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><!-- 编码过滤器 --><filter><filter-name>characterEncodingFilter</filter-name><filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class><init-param><param-name>encoding</param-name><param-value>UTF-8</param-value></init-param></filter><filter-mapping><filter-name>characterEncodingFilter</filter-name><url-pattern>/*</url-pattern></filter-mapping></web-app>
