全局异常处理

@ControllerAdvice
public class GlobalExceptionHandler {

    Logger logger = LoggerFactory.getLogger(GlobalExceptionHandler.class);

    /**
     * 返回的Map对象会被@ResponseBody注解转换为JSON数据返回
     * @return
     */
    @ResponseBody
    @ExceptionHandler(Exception.class)
    public Object handleException(HttpServletRequest request, Exception ex) {
        if (ex instanceof Ex) {
            Ex e = (Ex) ex;
            logger.error("Ex URL:" + request.getServletPath(), e.getMessage());
            if (((Ex) ex).getEx() instanceof SExCode) {
                return AjaxJson.Fail(e.getEx());
            } else {
                return AjaxJson.Fail(e);
            }
        } else {
            logger.error("Ex URL:" + request.getServletPath(), ex);
            return AjaxJson.Fail(SExCode.SYS);
        }
    }
}

instanceof 判断是否是自定义的异常是则返回统一参数

Ex为系统自定义异常

public class Ex extends RuntimeException {

    private Integer code = -1000;
    private String name;

    private ExCode ex;

    public Ex(String name) {
        this.name = name;
    }

    public Ex(Integer code, String name) {
        this.code = code;
        this.name = name;
    }

    public Ex(ExCode ex) {
        this.ex = ex;
        this.code = ex.getCode();
        this.name = ex.getName();
    }

    public Ex(ExCode ex, String message) {
        this.ex = ex;
        this.code = ex.getCode();
        this.name = ex.getName() + message;

    }

    public static Ex build(ExCode code) {
        return new Ex(code);
    }

    public static Ex build(ExCode code, String message) {
        return new Ex(code, message);
    }

    public static Ex build(String name) {
        return new Ex(name);
    }

    @Override
    public String getMessage() {
        return name;
    }

    public Integer getCode() {
        return code;
    }

    public ExCode getEx() {
        return ex;
    }

    public String getName() {
        return name;
    }
}

public interface ExCode {

    int getCode();

    String getName();
}

public enum SExCode implements ExCode {
    TOKEN_F(-1000, "token错误"),
    SYS(-3000, "系统内部错误"),
    TOKEN_N(-2000, "token为空");
    int code;

    String name;

    SExCode(int code, String name) {
        this.code = code;
        this.name = name;
    }

    @Override
    public int getCode() {
        return code;
    }

    @Override
    public String getName() {
        return name;
    }
}