Spring 的 RequestBody 注解rest访问出错 400 或者415

Spring 的 RequestBody 注解rest访问出错 400 或者415

/*
     * 测试Spring的RequestBody注解
     * 必须要有 contentType:'application/json;charset=UTF-8',
     * 传输的数据需要为json格式的字符串！！！
     * 如此当对应的数据类型匹配的时候则可以进行注入到controller的RequestBody
     *
     * */

 $.ajax({
      url: "/t_test/request", 
      dataType: "json",
      contentType:'application/json;charset=UTF-8',
      type: "post",
      data: '{"status": 1, "message": "message"}',
      success: function (data) {
         alert("success");
      },
      error: function(data) {
         alert("error");
      }
  });

服务器端：

    @RequestMapping("/request")
    public TestResponse request(@RequestBody TestRequest testRequest) {
       return new TestResponse(testRequest);
   }

    public static class TestRequest{
        private int status;
        private String message;

        public int getStatus() {
            return status;
        }

        public void setStatus(int status) {
            this.status = status;
        }

        public String getMessage() {
            return message;
        }

        public void setMessage(String message) {
            this.message = message;
        }
    }