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- 活动分类服务（暂基于枚举）
YueCatagoryEnum
{
All(
0,"所有分类"
),
Study
(
1,"学习分享"
),
Sport
(
2,"健身运动"
),
Game
(
3,"游戏娱乐"
),
Competition
(
4,"比赛信息"
),
GroupBuy
(
5,"组团优惠"
),
Else
(
9,"其它"
);
（1）通过id得到活动项
YueCatagoryEnum getById(int id)
（2）返回所有分类
List<YueCatagoryEnum> getAllCatagorys()
2. 活动城市枚举
YueCityEnum {
BeiJing(11,"北京"),
ShangHai(21,"上海"),
NanJing(31,"南京"),
HeFei(41,"合肥"),
WuHan(51,"武汉"),
XiAn(61,"西安");
（1）通过id得到城市
YueCityEnum getById
（2）获取所有城市枚举
List<YueCityEnum> getAllCities()
3. 活动地址形式枚举
YueAddressModeEnum {
All(0,"不限形式"),
OnLine(1,"线上"),
OffLine(2,"线下");
4. 活动状态枚举
YueActivityStatusEnum {
VerifyFailed(0,"审核失败"),
VerifySuccess(1,"审核通过"),
GoVerify(2,"提交审核"),