Java 统一异常处理

定义统一异常类

public class SysException extends RuntimeException {
    public SysException(String msg) {
        super(msg);
    }

    public static SysException init(String...msgs) {
        StringBuilder msg = new StringBuilder(16);
        for (String m : msgs) {
            msg.append(SysConstance.SPACE).append(m);
        }
        return new SysException(msg.substring(1));
    }
}

统一返回类封装

@Data
@Accessors(chain = true)
public class Response<T> {
	private int code;
	private String msg;
	private T data;

	/**
	 * 初始化默认为成功
	 * */
	private Response() {
		ResponseCodeEnum success = ResponseCodeEnum.SUCCESS;
		this.setCode(success.getCode()).setMsg(success.getDescribe());
	}

	public static <T> Response<DataList<T>> success(List<T> list, int count) {
		Response<DataList<T>> re = new Response<>();
		return re.setData(new DataList<T>().setCount(count).setList(list));
	}

	public static <T> Response<DataList<T>> success(List<T> list) {
		int count = 0;
		if (list != null && !list.isEmpty()) {
			count = list.size();
		}
		return success(list, count);
	}

	public static <T> Response<T> success(T data) {
		Response<T> r = new Response<>();
		return r.setData(data);
	}

	public static Response<String> success() {
		return new Response<>();
	}

	public static <T> Response<T> fail(String msg) {
		Response<T> r = new Response<>();
		ResponseCodeEnum fail = ResponseCodeEnum.FAIL;
		r.setCode(fail.getCode()).setMsg(fail.getDescribe());
		return r.setMsg(msg);
	}

	public static <T> Response<T> fail() {
		Response<T> r = new Response<>();
		ResponseCodeEnum fail = ResponseCodeEnum.UN_LOGIN;
		return r.setCode(fail.getCode()).setMsg(fail.getDescribe());
	}

	public static <T> Response<T> error() {
		Response<T> r = new Response<>();
		ResponseCodeEnum error = ResponseCodeEnum.ERROR;
		r.setCode(error.getCode()).setMsg(error.getDescribe());
		return r;
	}

}

数据封装

@Data
@Accessors(chain = true)
public class DataList<T> {
	private Integer count;
	private List<T> list;
}

异常处理类

@Slf4j
@Configuration
@Aspect
public class HandleException {
	private final String POINT_CUT = "execution(public * com.archives.management.controller..*(..))";
	@Pointcut(POINT_CUT)
	public void exception() {}

	@Around("exception()")
	public Object around(ProceedingJoinPoint point) {
		Object [] objs = point.getArgs();
		try {
			if (objs == null || objs.length == 0) {
				return point.proceed();
			} else {
				return point.proceed(objs);
			}
		} catch (Throwable e) {
			if (e instanceof SysException) {
				String returnType = getReturnType(point);
				if (returnType.equals(SysConstance.RESPONSE)) {
					return Response.fail(e.getMessage());
				} else if (returnType.equals(SysConstance.STRING)) {
					return SysConstance.EXCEPTION_500;
				} else {
					throw new RuntimeException(SysConstance.RETURN_FORMAT_ERROR);
				}
			} else {
				log.error(e.getMessage(), e);
				return SysConstance.EXCEPTION_500;
			}
		}
	}

	private String getReturnType(ProceedingJoinPoint point) {
		Signature s = point.getSignature();
		return s.toLongString().split(SysConstance.SPACE)[1];
	}
}