Was ist der beste Weg, um wieder verschiedene Arten von ResponseEntity in Spring MVC oder Spring-Boot

Können Sie die Rückgabe generischer Platzhalter <?> zurück Success und Error auf eine gleiche Anfrage mapping-Methode

public ResponseEntity<?> method() {
    boolean b = //some logic
    if (b)
        return new ResponseEntity<Success>(HttpStatus.OK);
    else
        return new ResponseEntity<Error>(HttpStatus.CONFLICT); //appropriate error code
}

@Mark Norman Antwort ist der richtige Ansatz,

Seiner Rückkehr ResponseEntity ohne die Verwendung von Generika, wie folgt,

public ResponseEntity method() {
    boolean isValid = //some logic
    if (isValid){
        return new ResponseEntity(new Success(), HttpStatus.OK);
    }
    else{
        return new ResponseEntity(new Error(), HttpStatus.BAD_REQUEST);
    }
}

Hier ist eine Möglichkeit, dass ich es tun würde:

public ResponseEntity < ? extends BaseResponse > message(@PathVariable String player) { //REST Endpoint.

 try {
  Integer.parseInt(player);
  return new ResponseEntity < ErrorResponse > (new ErrorResponse("111", "player is not found"), HttpStatus.BAD_REQUEST);
 } catch (Exception e) {


 }
 Message msg = new Message(player, "Hello " + player);
 return new ResponseEntity < Message > (msg, HttpStatus.OK);

}

@RequestMapping(value = "/getAll/{player}", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE)
public ResponseEntity < List < ? extends BaseResponse >> messageAll(@PathVariable String player) { //REST Endpoint.

 try {
  Integer.parseInt(player);
  List < ErrorResponse > errs = new ArrayList < ErrorResponse > ();
  errs.add(new ErrorResponse("111", "player is not found"));
  return new ResponseEntity < List < ? extends BaseResponse >> (errs, HttpStatus.BAD_REQUEST);
 } catch (Exception e) {


 }
 Message msg = new Message(player, "Hello " + player);
 List < Message > msgList = new ArrayList < Message > ();
 msgList.add(msg);
 return new ResponseEntity < List < ? extends BaseResponse >> (msgList, HttpStatus.OK);

}

Ich verwendet, um eine Klasse verwenden wie dieses. Die statusCode wird gesetzt, wenn ein Fehler mit der Fehlermeldung set in Nachricht. Daten werden entweder in der Karte oder in einer Liste wie und bei Bedarf.

/**
* 
*/
package com.test.presentation.response;

import java.util.Collection;
import java.util.Map;

/**
 * A simple POJO to send JSON response to ajax requests. This POJO enables  us to
 * send messages and error codes with the actual objects in the application.
 * 
 * 
 */
@SuppressWarnings("rawtypes")
public class GenericResponse {

/**
 * An array that contains the actual objects
 */
private Collection rows;

/**
 * An Map that contains the actual objects
 */
private Map mapData;

/**
 * A String containing error code. Set to 1 if there is an error
 */
private int statusCode = 0;

/**
 * A String containing error message.
 */
private String message;

/**
 * An array that contains the actual objects
 * 
 * @return the rows
 */
public Collection getRows() {
    return rows;
}

/**
 * An array that contains the actual objects
 * 
 * @param rows
 *            the rows to set
 */
public void setRows(Collection rows) {
    this.rows = rows;
}

/**
 * An Map that contains the actual objects
 * 
 * @return the mapData
 */
public Map getMapData() {
    return mapData;
}

/**
 * An Map that contains the actual objects
 * 
 * @param mapData
 *            the mapData to set
 */
public void setMapData(Map mapData) {
    this.mapData = mapData;
}

/**
 * A String containing error code.
 * 
 * @return the errorCode
 */
public int getStatusCode() {
    return statusCode;
}

/**
 * A String containing error code.
 * 
 * @param errorCode
 *            the errorCode to set
 */
public void setStatusCode(int errorCode) {
    this.statusCode = errorCode;
}

/**
 * A String containing error message.
 * 
 * @return the errorMessage
 */
public String getMessage() {
    return message;
}

/**
 * A String containing error message.
 * 
 * @param errorMessage
 *            the errorMessage to set
 */
public void setMessage(String errorMessage) {
    this.message = errorMessage;
}

}

Hoffe, das hilft.