@RestControllerAdvice注解使用

import lombok.extern.slf4j.Slf4j;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;
import org.springframework.web.servlet.NoHandlerFoundException;

@Slf4j
@RestControllerAdvice
public class GlobalExceptionHandler {

    /**
     * 处理运行异常
     */
    @ExceptionHandler(RuntimeException.class)
    public ResponseEntity<String> handleRuntimeException(RuntimeException ex) {
        log.error("", ex);
        return new ResponseEntity<>(ex.getMessage(), HttpStatus.BAD_REQUEST);
    }

    /**
     * 用来捕获404，400这种无法到达controller的错误
     *
     * @param ex
     * @return
     * @throws Exception
     */
    @ExceptionHandler(value = Exception.class)
    public ResponseData defaultErrorHandler(Exception ex) throws Exception {
        log.error("", ex);
        ResponseData<Object> result = new ResponseData<Object>();
        result.setMessage(ex.getMessage());
        if (ex instanceof NoHandlerFoundException) {
            result.setCode("404");
        } else {
            result.setCode("500");
        }
        result.setData(null);
        result.setSuccess(false);
        return result;
    }
}