Unified Interface return and Global exception handling in SpringBoot

Global exception handling

Write a custom exception base class @ Datapublic class BaseException extends RuntimeException {private static final int BASE_EXCEPTION_CODE = ResultCode.INTERNAL_ERROR.code (); private static final String BASE_EXCEPTION_MESSAGE = ResultCode.INTERNAL_ERROR.message (); private Integer code; private String message; public BaseException () {super (BASE_EXCEPTION_MESSAGE); this.code = BASE_EXCEPTION_CODE; this.message = BASE_EXCEPTION_MESSAGE } public BaseException (String message) {super (message); this.code = BASE_EXCEPTION_CODE; this.message = message;} public BaseException (ResultCode resultCode) {super (resultCode.message ()); this.code = resultCode.code (); this.message = resultCode.message ();} public BaseException (Throwable cause) {super (cause) This.code = BASE_EXCEPTION_CODE; this.message = BASE_EXCEPTION_MESSAGE;} public BaseException (String message, Throwable cause) {super (message, cause); this.code = BASE_EXCEPTION_CODE; this.message = message;} public BaseException (Integer code, String message) {super (message); this.code = code; this.message = message } public BaseException (Integer code, String message, Throwable cause) {super (message, cause); this.code = code; this.message = message;}} write a custom business exception class public class BizException extends BaseException {public BizException (ResultCode resultCode) {super (resultCode);}} define a global exception handling class

Uniformly handle a certain type of exception through the @ ExceptionHandler annotation

@ Slf4j@RestControllerAdvicepublic class GlobalExceptionHandler {/ * uniformly handle custom base exceptions * / @ ExceptionHandler (BaseException.class) public ErrorResult baseException (BaseException e) {if (StringUtils.isEmpty (e.getCode ()) {return ErrorResult.error (e.getMessage ());} return ErrorResult.error (e.getCode (), e.getMessage () Unified handling of custom business exceptions * / @ ExceptionHandler (BizException.class) public ErrorResult bizException (BizException e) {if (StringUtils.isEmpty (e.getCode () {return ErrorResult.error (e.getMessage ());} return ErrorResult.error (e.getCode (), e.getMessage ()) } / * handle all exceptions except for custom exceptions * / @ ExceptionHandler (Exception.class) public ErrorResult handleException (Exception e) {log.error (e.getMessage (), e); return ErrorResult.error (e.getMessage ()) } / * compatible Validation verification framework: ignore parameter exception handler * / @ ExceptionHandler (MissingServletRequestParameterException.class) public ApiResult parameterMissingExceptionHandler (MissingServletRequestParameterException e) {log.error (e.getMessage (), e); return ErrorResult.error (PARAMETER_EXCEPTION, "request parameters" + e.getParameterName () + "cannot be empty") } / * compatible Validation check framework: missing request body exception handler * / @ ExceptionHandler (HttpMessageNotReadableException.class) public ErrorResult parameterBodyMissingExceptionHandler (HttpMessageNotReadableException e) {log.error (e.getMessage (), e); return ErrorResult.error (PARAMETER_EXCEPTION, "parameter body cannot be empty") } / * compatible Validation verification framework: parameter validation exception handler * / @ ExceptionHandler (MethodArgumentNotValidException.class) public ErrorResult parameterExceptionHandler (MethodArgumentNotValidException e) {log.error (e.getMessage (), e); / / get exception information BindingResult exceptions = e.getBindingResult () / / determine whether there is an error message in the exception, and if so, use the message in the exception, otherwise use the default message if (exceptions.hasErrors ()) {List errors = exceptions.getAllErrors () If (! errors.isEmpty ()) {/ / all the error parameters are listed here. According to normal logic, only the first error is needed to FieldError fieldError = (FieldError) errors.get (0); return ErrorResult.error (PARAMETER_EXCEPTION, fieldError.getDefaultMessage ()) }} return ErrorResult.error (PARAMETER_EXCEPTION, "request parameter verification exception");} API call @ ResponseResult @ GetMapping public User update () {/ / non-custom runtime exception long id = 10 / 0; return userService.queryById (id) } @ ResponseResult @ PostMapping public User insert () {/ / throw custom base exception throw new BaseException ();} @ ResponseResult @ DeleteMapping public boolean delete () {/ / throw custom business exception throw new BizException (USER_NOT_EXIST_ERROR);} test result

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