SpringBoot 創建自定義異常

-----------------------------------------自定義異常類------------------------------------------
// 自定義異常類
@NoArgsConstructor
@AllArgsConstructor
@Getter
public class MyException extends RuntimeException {
    private ExceptionEnum exceptionEnum;
}

-----------------------------------------------------------定義異常枚舉--------------------------------------------------------------

@Getter
@AllArgsConstructor
@NoArgsConstructor
public enum ExceptionEnum {
    PRICE_CANNOT_BE_NULL(400,"價格不能爲空");
    private int code;
    private String msg;
}

-----------------------------------------------------------定義異常返回對象--------------------------------------------------------------

@Data
public class ExceptionResult {
    private int status;
    private String message;
    private Long timestamp;

    public ExceptionResult(ExceptionEnum em) {
        this.status = em.getCode();
        this.message = em.getMsg();
        this.timestamp = System.currentTimeMillis();
    }
}

-----------------------------------------------------------定義異常捕捉類--------------------------------------------------------------

@ControllerAdvice
public class CommonExceptionHandler {
    @ExceptionHandler(MyException.class)
    public ResponseEntity<ExceptionResult> handleException(MyException exception) {
        return ResponseEntity.status(exception.getExceptionEnum().getCode()).body(new ExceptionResult(exception.getExceptionEnum()));
    }
}

-----------------------------------------------------------方法調用--------------------------------------------------------------

@RestController
@RequestMapping("item")
public class ItemController {
    @Autowired
    private ItemService itemService;

    @PostMapping
    public ResponseEntity<Item> saveItem(Item item) {
        if (item.getPrice() == null) {
            throw new MyException(ExceptionEnum.PRICE_CANNOT_BE_NULL);
        }
        item = itemService.saveItem(item);
        return ResponseEntity.status(HttpStatus.CREATED).body(item);
    }
}
---------------------------------------------------返回結果----------------------------------------

{

"status": 400,

"message": "價格不能爲空",

"timestamp": 1572315505000

}