本文介绍如何在Spring MVC中实现请求与响应的JSON格式数据交换，包括配置JSON转换器、编写控制器处理请求及使用AJAX发起JSON请求。
7.1.请求Json响应Json
1.添加处理json数据配置
<!-- 注解适配器：添加json转换器-->
<beanclass="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
<propertyname="messageConverters">
<list>
<beanclass="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"></bean>
</list>
</property>
</bean>
1.编写代码【请求json、返回json】
@Controller
@RequestMapping("json")
public class MyJsonController {
@RequestMapping("requestJson.do")
public @ResponseBody User requestJson(Model model,@RequestBody User u){
System.out.println("用户信息:"+u);
returnu;
}}
2.编写页面ajax
<%@ page language="java"contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type"content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script type="text/javascript"src="${pageContext.request.contextPath}/js/jquery-1.9.1.min.js"></script>
<script type="text/javascript">
//请求json，返回json
function request_json(){
var user =JSON.stringify({"userName:"张思德","age":"21"});
$.ajax({
type:'POST',
url:'${pageContext.request.contextPath}/json/requestJson.do',
contentType:'application/json;charset=utf-8',
data:user,
success : function(data){
alert(data.userName+":"+data.age);
}
})
}
</script>
</head>
<body>
<input type="button"onclick="request_json()" value="请求json，返回json">
</body>
</html>
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