我对每个 json 有效负载都有 DTO。我通过 http post 请求获取有效负载。

Question

我有有效载荷 1、有效载荷 2 和有效载荷 3 的 DTO。如何获得有效载荷3？使用payload 1和payload 2。如何建立数据模型之间的映射关系？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;}} 数据模型 2public class Guid{private string guid; } 数据模型 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){不知道从这里怎么做...       for(Payload temp: payload){         temp.getLongValue()=dataRequestModel.getData().         } } }  这些是 JSON 1.JSON payload1的结构  {    "data":{   "value1":{      "val":30 }, "value2":{   "val":20 }  }, "timestamp":155501523}2.JSON有效载荷2       {         "guid":[         "/value1",       "/value2"       ]       }3.JSON最终payload（待发送）     [       {       "guid":"/value1",     "longvalue":30,     "timestamp":155501523     },     {       "guid":"/value2",     "longvalue":20,     "timestamp":155501523     }     ]我生成有效载荷 3 的代码是   @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(). } } }

Answer 1

您不需要 for 循环来执行此操作，在public void data创建List<Payload>

public void data(@RequestBody DataRequestModel dataRequestModel)  {

  List<Payload> list = new ArrayList<>();

  // first object

  Payload payload1 = new Payload();

  payload1.setGuid(//set value);

  payload1.setLongValue(dataRequestModel.getData().getValue1().getVal());

  payload1.setTimestamp(dataRequestModel.getTimestamp());

  list.add(payload1);

  // second object

  Payload payload2 = new Payload();

   payload12setGuid(//set value);

  payload2.setLongValue(dataRequestModel.getData().getValue2().getVal());

  payload1.setTimestamp(dataRequestModel.getTimestamp());

  list.add(payload2);

然后终于返回List