<button id="btn" onclick="jsonFuc()">json测试</button>
function jsonFuc(){     $.ajax({url: 'springmvc/testJsonList',type: 'POST',dataType:'json',async:true,data:{username:'123',age:'12'},success:function(data) {console.log(data)                }});
}

@ResponseBody@RequestMapping("/testJsonList")public List<User> testJsonList(@RequestParam String username,@RequestParam Integer age){System.out.println(username+"   "+age);List<User> userlist = new ArrayList<User>();User user =new User();user.setId(1);user.setAge(12);user.setEmail("11@qq.com");user.setUsername("张扬");user.setPassword("123456");user.setSex("男");User user1 =new User();user1.setId(2);user1.setAge(12);user1.setEmail("11@qq.com");user1.setUsername("张扬");user1.setPassword("123456");user1.setSex("男");userlist.add(user);userlist.add(user1);return userlist;        }

<button id="btn" onclick="jsonFuc()">json测试</button>
function jsonFuc(){var users = {'username':'123','age':'12'};$.ajax({url: 'springmvc/testJsonMap',type: 'POST',dataType:'json',async:true,data:{users:JSON.stringify(users)},success:function(data) {console.log(data)                }});}

@ResponseBody@RequestMapping("/testJsonMap")public Map<String,Object> testJsonMap(@RequestParam String users){System.out.println(users);JSONObject json=JSONObject.fromObject(users);System.out.println(json);System.out.println(json.getString("username")+"  "+json.getString("age"));Map<String, Object> map = new HashMap<String, Object>();List<User> userlist = new ArrayList<User>();User user =new User();user.setId(1);user.setAge(12);user.setEmail("11@qq.com");user.setUsername("张扬");user.setPassword("123456");user.setSex("男");User user1 =new User();user1.setId(2);user1.setAge(12);user1.setEmail("11@qq.com");user1.setUsername("张扬");user1.setPassword("123456");user1.setSex("男");userlist.add(user);userlist.add(user1);map.put("user", userlist);map.put("id", 1);return map;        }