SpringBoot中GlobalExceptionHandler异常处理机制详细说明

@ControllerAdvice
public class GlobalExceptionHandler {

    @ExceptionHandler(value = { InvalidRequestException.class })
    public ResponseEntity<Object> handleInvalidRequestException(InvalidRequestException ex) {
        // 记录异常信息到日志文件
        log.error("Invalid request: ", ex);

        // 返回HTTP错误代码和异常信息
        return new ResponseEntity<>(ex.getMessage(), HttpStatus.BAD_REQUEST);
    }

    @ExceptionHandler(value = { ResourceNotFoundException.class })
    public ResponseEntity<Object> handleResourceNotFoundException(ResourceNotFoundException ex) {
        // 记录异常信息到日志文件
        log.error("Resource not found: ", ex);

        // 返回HTTP错误代码和异常信息
        return new ResponseEntity<>(ex.getMessage(), HttpStatus.NOT_FOUND);
    }

    @ExceptionHandler(value = { Exception.class })
    public ResponseEntity<Object> handleException(Exception ex) {
        // 记录异常信息到日志文件
        log.error("An exception occurred: ", ex);

        // 返回HTTP错误代码和异常信息
        return new ResponseEntity<>(ex.getMessage(), HttpStatus.INTERNAL_SERVER_ERROR);
    }
}

@Service
public class ProductService {

    @Autowired
    private ProductClient productClient;

    @HystrixCommand(fallbackMethod = "getProductFallback")
    public Product getProductById(Long id) {
        return productClient.getProductById(id);
    }

    public Product getProductFallback(Long id) {
        // 返回默认的产品信息
        return new Product(0L, "Default Product", BigDecimal.ZERO);
    }
}