SpringMVC全局异常处理

第一种方式：@ControllerAdvice + @ExceptionHandler

该类必须被Spring容器扫描到，可以根据具体的异常具体处理

@RestControllerAdvice
public class ExceptionHandler {

    @org.springframework.web.bind.annotation.ExceptionHandler(Exception.class)
    public ServerResponse handler(Exception e) {
        return ServerResponse.createByError("接口异常", e.toString());
    }
}

ServerResponse是封装的返回给前端的类

@JsonSerialize(include = JsonSerialize.Inclusion.NON_NULL) //字段为null的不序列化
public class ServerResponse<T> implements Serializable {
    private int status;
    private String msg;
    private T data;

    public int getStatus() {
        return status;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public T getData() {
        return data;
    }

    public void setData(T data) {
        this.data = data;
    }

    private ServerResponse(int status) {
        this.status = status;
    }

    private ServerResponse(int status, String msg) {
        this.status = status;
        this.msg = msg;
    }

    private ServerResponse(int status, T data) {
        this.data = data;
    }

    private ServerResponse(int status, String msg, T data) {
        this.status = status;
        this.msg = msg;
        this.data = data;
    }

    public static <T> ServerResponse<T> createBySuccess() {
        return new ServerResponse<>(ResponseCode.SUCCESS.getCode());
    }

    public static <T> ServerResponse<T> createBySuccess(String msg) {
        return new ServerResponse<T>(ResponseCode.SUCCESS.getCode(), msg);
    }

    public static <T> ServerResponse<T> createBySuccess(T data) {
        return new ServerResponse<T>(ResponseCode.SUCCESS.getCode(), data);
    }

    public static <T> ServerResponse<T> createBySuccess(String msg, T data) {
        return new ServerResponse<T>(ResponseCode.SUCCESS.getCode(), msg, data);
    }

    public static <T> ServerResponse<T> createByError() {
        return new ServerResponse<T>(ResponseCode.ERROR.getCode(), ResponseCode.ERROR.getDesc());
    }

    public static <T> ServerResponse<T> createByError(String errormsg) {
        return new ServerResponse<T>(ResponseCode.ERROR.getCode(), errormsg);
    }

    public static <T> ServerResponse<T> createByError(int errorcode, String errormsg) {
        return new ServerResponse<T>(errorcode, errormsg);
    }

    public static <T> ServerResponse<T> createByError(String errormsg, T data) {
        return new ServerResponse<T>(ResponseCode.ERROR.getCode(), errormsg, data);
    }

    /**
     * 忽略  不返回给前端
     *
     * @return
     */
    @JsonIgnore
    public boolean isSuccess() {
        return this.status == ResponseCode.SUCCESS.getCode();
    }


    @Override
    public String toString() {
        return "ServerResponse{" +
                "status=" + status +
                ", msg='" + msg + '\'' +
                ", data=" + data +
                '}';
    }
}

第二张方式：实现HandlerExceptionResolver

该类也必须被Spring容器扫描到

@Slf4j
@Component
public class ExceptionResolver implements HandlerExceptionResolver {
    @Override
    public ModelAndView resolveException(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) {
        log.error("{} exception", httpServletRequest.getRequestURI(), e);
        ModelAndView modelAndView = new ModelAndView(new MappingJackson2JsonView());
        modelAndView.addObject("status", ResponseCode.ERROR.getCode());
        modelAndView.addObject("mgs", "接口异常，详情查看服务端");
        modelAndView.addObject("data", e.toString());
        return modelAndView;
    }
}