使用mockmvc传递对象一直为null？

Question

困扰了好久的问题，请各位热心的网友帮忙看一下，谢谢！！
测试用例：使用mockmvc传string类型的可以，但是把对象转为string就不可以了

@Test
public void testsaveDTO(){
try{
DataModifyDTO dataModifyDTO = dataModifyService.getApplyInfoByDmID("dm_1001");
String requestionJson = JSONObject.toJSONString(dataModifyDTO);
mockMvc.perform(post("/newdatamodify.do")
.contentType(MediaType.APPLICATION_JSON).content(requestionJson))
.andDo(print())
.andReturn();
}catch(Exception e)
e.printStackTrace();
}

Ctroller如下：dataModifyDTO的属性值一直为null

@RequestMapping(value="newdatamodify.do",method = RequestMethod.POST)
@ResponseBody
public Object newdatamodify(HttpSession session, DataModifyDTO dataModifyDTO){
if(dataModifyDTO != null){
. . .
}
}

Answer 1

https://cloud.tencent.com/developer/ask/175638/answer/279277