我有有效載荷 1、有效載荷 2 和有效載荷 3 的 DTO。如何獲得有效載荷3？使用payload 1和payload 2。如何建立數據模型之間的映射關系？DTO 1public class DataRequestModel {private DataValue data; //some exampleprivate long  timestamp;@Datapublic static class DataValue {private Value1 value1;private Value2 value2;}@Datapublic static class Value1 {    private long val;}@Datapublic static class Value2 {    private long val;}} 數據模型 2public class Guid{private string guid; } 數據模型 3 public class payload{ private String guid; private long longvalue; private long timestamp; }## Controller@RestController@RequestMapping("/users")public class DataTransferController { List<Payload> payload; @PostMapping("/list") public void data(@RequestBody DataRequestModel dataRequestModel){不知道從這里怎么做...       for(Payload temp: payload){         temp.getLongValue()=dataRequestModel.getData().         } } }  這些是 JSON 1.JSON payload1的結構  {    "data":{   "value1":{      "val":30 }, "value2":{   "val":20 }  }, "timestamp":155501523}2.JSON有效載荷2       {         "guid":[         "/value1",       "/value2"       ]       }3.JSON最終payload（待發(fā)送）     [       {       "guid":"/value1",     "longvalue":30,     "timestamp":155501523     },     {       "guid":"/value2",     "longvalue":20,     "timestamp":155501523     }     ]我生成有效載荷 3 的代碼是   @RestController @RequestMapping("/users") public class DataTransferController     {     List<Payload> payload; @PostMapping("/list")    public void data(@RequestBody DataRequestModel dataRequestModel)    {     Not sure how to do from here... for(TimeseriesPayload temp: timeseriesPayload){ temp.getLongValue()=dataRequestModel.getData(). } } }