Java 使用jquery/spring/jackson将json转换为pojo

“我在中获取的输出”对话框显示：

public @ResponseBody MyDTO saveDTO(@Valid final MyDTO myDTO,BindingResult result, Model model){
 System.out.println(myDTO.getMyField + "  " + myDTO.getSecondField;
 return new MyDTO();
}

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虽然我的sys out控制台输出显示两个字段都为空，但json尚未绑定！！！为什么？DTO本身只有两个带有适当getter/setter的私有字段

为

MyDTO添加代码。myDTO字段为空，sys out print命令pritns out null。我正在重新调整一个新对象以检查正确的映射。我认为问题出在我的序列化程序/反序列化程序中
{"myField":null,"secondField":null} //new empty dto converted and returned spring

{"myField":"RU","secondField":"13-02-12"} //submitted data, a form converted to json

{"myField":null,"secondField":null} //new empty dto converted and returned spring

{"myField":"RU","secondField":"13-02-12"} //submitted data, a form converted to json

//js
var mySubmitData ='{"myField":"myFieldValue", "secondField":"secondFieldValue"}';
//dto
public class MyDTO implements Serializable {

  private String myField;

  private String secondField;

  MyDTO() {} //important

  public void setMyField() { ...}

  public void setSecondField() { ... }
}
//web resource
    public @ResponseBody MyDTO saveDTO(@Valid final MyDTO myDTO,BindingResult result, Model model){
     System.out.println(myDTO.getMyField + "  " + myDTO.getSecondField;
      return  myDTO;
      //return new MyDTO(); //it's empy object if you don't have default values
    }