@ResponseBody和@RequestBody注解的区别

/**
* 用于类上，可以没有
*/

@RequestMapping(value = "/controllerDemo")
public class ControllerDemo {
  // 用于方法上，必须有
  @RequestMapping(value = "/methodDemo")
  public String methodDemo() {
    return "helloWorld";
  }
}

@RequestMapping(value = "person/login")
@ResponseBody
public Person login(@RequestBody Person person) {  // 将请求中的 datas 写入 Person 对象中
  return person;  // 不会被解析为跳转路径，而是直接写入 HTTP 响应正文中
}

function login() {
  var datas = '{"name":"' + $('#name').val() + '","id":"' + $('#id').val() + '","status":"' + $('#status').val() + '"}';
  $.ajax({
    type : 'POST',
    contentType : 'application/json',
    url : "${pageContext.request.contextPath}/person/login",
    processData : false,
    dataType : 'json',
    data : datas,
    success : function(data) {
      alert("id: " + data.id + "name: " + data.name + "status: "+ data.status);
    },
    error : function() {
      alert('Sorry, it is wrong!');
    }
  });
};

/**
* @RequestMapping(value = "/person/profile/{id}/{name}/{status}") 中的 {id}/{name}/{status}
* 与 @PathVariable int id、@PathVariable String name、@PathVariable boolean status
* 一一对应，按名匹配。
*/

@RequestMapping(value = "person/profile/{id}/{name}/{status}")
@ResponseBody
public Person porfile(@PathVariable int id, @PathVariable String name, @PathVariable boolean status) {
  return new Person(id, name, status);
}

function profile() {
  var url = "${pageContext.request.contextPath}/person/profile/";
  var query = $('#id').val() + '/' + $('#name').val() + '/' + $('#status').val();
  url += query;
  $.get(url, function(data) {
    alert("id: " + data.id + "name: " + data.name + "status: "
        + data.status);
  });
}