Spring ResponseEntity不返回所有对象属性

Question

I am using JPA to return an object from a database using a rest controller. My problem is that when I use the repo.findOne() method to return a single object, and I return that single object, the JSON returned to the client is missing most of the objects attributes. ie return new ResponseEntity<>(objectA, HttpStatus.OK);

However if I place objectA into an array, and return the array ie return new ResponseEntity<>(arrayWithObjectA, HttpStatus.OK); the correct JSON is returned to the client with all attributes. Can anyone explain why this is so?

Thanks

Answer 1

Create a ResponseHandler.java file and write below code

import java.util.Date;
import java.util.HashMap;
import java.util.Map;

import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;

public class ResponseHandler {

    public static ResponseEntity<Object> generateResponse(HttpStatus status, boolean error,String message, Object responseObj) {
        Map<String, Object> map = new HashMap<String, Object>();
        try {
            map.put("timestamp", new Date());
            map.put("status", status.value());
            map.put("error", error);
            map.put("message", message);
            map.put("data", responseObj);

            return new ResponseEntity<Object>(map,status);
        } catch (Exception e) {
            map.clear();
            map.put("timestamp", new Date());
            map.put("status", HttpStatus.INTERNAL_SERVER_ERROR.value());
            map.put("message", e.getMessage());
            return new ResponseEntity<Object>(map,status);
        }
    }

Now in your api use

return ResponseHandler.generateResponse(HttpStatus.OK,false,"Write some message", objectA);

Return type of your method should be ResponseEntity<Object>