@ResponseBody将集合数据转换为json格式并返回给客户端

<beans 
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    >
<mvc:annotation-driven/>

$.post("${pageContext.request.contextPath}/getJson",{},function(data){                 
    alert(JSON.stringify(data));
});

@RequestMapping("/getJson")
@ResponseBody
public List<User> getJson(){
    List<User> list = new ArrayList<User>();
    User user1 = new User(10, "刘德华", 45);
    User user2 = new User(12, "张学友", 46);
    list.add(user1);
    list.add(user2);
    return list;
}