Restful Spring啟動應用程序中的異常映射

Question

我有一個自定義的Exception類，當發生異常時，我想作為json返回。

SpringCacheException.java

@JsonSerialize
public class SpringCacheException extends Exception{
    private static final long serialVersionUID = 1L;
    private HttpStatus status;
    @JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "dd-MM-yyyy hh:mm:ss")
    private LocalDateTime timestamp;
    private String message;
    private String debugMessage;
    public SpringCacheException(HttpStatus status, String message, String debugMessage) {
        super();
        this.setStatus(status);
        this.message = message;
        this.debugMessage = debugMessage;
    }
    public SpringCacheException() {
        timestamp = LocalDateTime.now();
    }

    public SpringCacheException(HttpStatus status) {
        this();
        this.setStatus(status);
    }

    public SpringCacheException(HttpStatus status, Throwable ex) {
        this();
        this.setStatus(status);
        this.setMessage("Unexpected error");
        this.setDebugMessage(ex.getLocalizedMessage());
    }

    public SpringCacheException(HttpStatus status, String message, Throwable ex) {
        this();
        this.setStatus(status);
        this.setMessage(message);
        this.setDebugMessage(ex.getLocalizedMessage());
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    public String getDebugMessage() {
        return debugMessage;
    }

    public void setDebugMessage(String debugMessage) {
        this.debugMessage = debugMessage;
    }
    public HttpStatus getStatus() {
        return status;
    }
    public void setStatus(HttpStatus status) {
        this.status = status;
    }
}

RestExceptionHandler.java

 @Order(Ordered.HIGHEST_PRECEDENCE)
    @ControllerAdvice
    public class RestExceptionHandler extends ResponseEntityExceptionHandler {
        private static final Logger logger= LoggerFactory.getLogger(ContactServiceImpl.class);

         @Override
            protected ResponseEntity<Object> handleMethodArgumentNotValid(MethodArgumentNotValidException ex, HttpHeaders headers, HttpStatus status, WebRequest request) {
                SpringCacheException errorMessage = new SpringCacheException(status.BAD_REQUEST,"My Error",ex);
                return new ResponseEntity<Object>(errorMessage, headers, status);
            }

@ExceptionHandler(SpringCacheException.class)
        ResponseEntity<Object> handleBadRequests(HttpStatus status,String message,SpringCacheException ex) throws IOException  {
            SpringCacheException errorMessage = new SpringCacheException(HttpStatus.BAD_REQUEST,"My Error",ex);
            return new ResponseEntity<Object>(errorMessage,HttpStatus.BAD_REQUEST);
        }
    }

拋出異常：

@Override
    public Contact show(int id) throws SpringCacheException  {
        try {
            Contact contact = contactRepository.findOneById(id);
            return contact;
        }
        catch (Exception e) {
            throw new SpringCacheException();
        }
    }

在這里，我正在從數據庫中刪除聯系人表，並且引發了異常，並且得到了以下較長的響應。

     Position: 111
2017-10-22 00:37:08.577  WARN 10336 --- [nio-8080-exec-1] .m.m.a.ExceptionHandlerExceptionResolver : Failed to invoke @ExceptionHandler method: org.springframework.http.ResponseEntity<java.lang.Object> com.myapp.exception.RestExceptionHandler.handleBadRequests(org.springframework.http.HttpStatus,java.lang.String,com.myapp.exception.SpringCacheException) throws java.io.IOException

我只想要一個SpringCacheException類型的json，但是我得到的是帶有錯誤數據的長json。 誰能告訴我我在哪里做錯了。 謝謝 ！

整個代碼可以在以下位置找到-https: //github.com/iftekharkhan09/SpringCaching

Answer 1

您的異常處理程序方法需要SpringCacheException對象的單個參數（其批注中的類）。

@ExceptionHandler(SpringCacheException.class)
        ResponseEntity<Object> handleBadRequests(SpringCacheException ex) throws IOException  {
            //SpringCacheException errorMessage = new SpringCacheException(HttpStatus.BAD_REQUEST,"My Error",ex);
            return new ResponseEntity<Object>(ex, HttpStatus.BAD_REQUEST);
        }
    }

順便說一句，創建一個新的SpringCacheException違反了該處理程序的目的。 您應該返回傳遞給方法的異常

我分叉了您的項目，並將其固定在這里： https : //github.com/olantobi/SpringCaching