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GET
contentType:"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 org.apache.commons.logging.Log;
import org.apache.commons.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;
}
@Override
public String toString() {
return "Book [id=" + id + ", name=" + name + ", author=" + author + "]";
}
}
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:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/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="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
http://xmlns.jcp.org/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>
