SpringMVC设置全局异常处理器的步骤

import lombok.extern.slf4j.Slf4j;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;
@Slf4j
@ControllerAdvice
public class GlobalExceptionHandler {
    /**
     * 处理参数错误的异常
     * @param e
     * @return
     */
    @ResponseBody
    @ExceptionHandler(value = IllegalParamsException.class)
    public ResultVO<Object> handleIllegalParamsException(IllegalParamsException e) {
        ResultVO<Object> resultVo = new ResultVO<>();
        resultVo.setStatus(HttpStatus.BAD_REQUEST.value());
        resultVo.setErrorCode(e.getErrorInfo().getErrorCode());
        resultVo.setErrorMsg(e.getErrorInfo().getErrorDesc());
        return resultVo;
    }
    @ResponseBody
    @ExceptionHandler(value = Exception.class)
    public ResultVO<Object> handleException(Exception e) {
        ResultVO<Object> resultVo = new ResultVO<>();
        resultVo.setStatus(HttpStatus.INTERNAL_SERVER_ERROR.value());
        resultVo.setErrorMsg(e.getMessage());
        return resultVo;
    }
}

@Data
@AllArgsConstructor
@NoArgsConstructor
public class ResultVO<T> {
    private Integer status;
    private String errorCode;
    private String errorMsg;
    private T data;
    public ResultVO(Integer status, String errorCode, String errorMsg) {
        this.status = status;
        this.errorCode = errorCode;
        this.errorMsg = errorMsg;
    }
}

public class IllegalParamsException extends RuntimeException {
    private static final long serialVersionUID = -6298406656682893468L;
    private OperationErrorEnum errorInfo;
    public IllegalParamsException(OperationErrorEnum errorInfo) {
        this.errorInfo = errorInfo;
    }
    public IllegalParamsException(String message, OperationErrorEnum errorInfo) {
        super(message);
        this.errorInfo = errorInfo;
    }
    public IllegalParamsException(String message, Throwable cause, OperationErrorEnum errorInfo) {
        super(message, cause);
        this.errorInfo = errorInfo;
    }
    public IllegalParamsException(Throwable cause, OperationErrorEnum errorInfo) {
        super(cause);
        this.errorInfo = errorInfo;
    }
    public IllegalParamsException(String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace, OperationErrorEnum errorInfo) {
        super(message, cause, enableSuppression, writableStackTrace);
        this.errorInfo = errorInfo;
    }
    public OperationErrorEnum getErrorInfo() {
        return errorInfo;
    }
}

         @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
     try {
     // 业务代码
 } catch (Exception e) {
            response.setContentType(MediaType.APPLICATION_JSON_UTF8_VALUE);
            ResultVO<Object> resultVo = new ResultVO<>();
            resultVo.setStatus(HttpStatus.UNAUTHORIZED.value());
            resultVo.setErrorMsg(ACCESS_PARAM_ERROR.getErrorDesc());
            response.getOutputStream().write(new String(JSON.toJSONString(resultVo)).getBytes(StandardCharsets.UTF_8));
            logger.error("==== WhiteListAndAuthenticationInterceptor拦截器拦截到了方法：{} 解析鉴权参数异常  ====", methodName);
            return false;
        }
    }