更新了后端代码，修复了多用户的bug

See merge request 0010-qingyun/backend!44

更新了后端的内容

See merge request 0010-qingyun/backend!43

更新后端代码

See merge request 0010-qingyun/backend!42

更新后端代码

See merge request 0010-qingyun/backend!41

更新后端代码

See merge request 0010-qingyun/backend!40

update:Dockerfile

See merge request 0010-qingyun/backend!39

更新后端代码

See merge request 0010-qingyun/backend!38

创建迭代三后端代码

See merge request 0010-qingyun/backend!37

后端更新最新SentiStrength的jar包

See merge request 0010-qingyun/backend!36

更新了后端

See merge request 0010-qingyun/backend!35

更新了后端

See merge request 0010-qingyun/backend!34

持续更新后端

See merge request 0010-qingyun/backend!33

后端更新了token认证

See merge request 0010-qingyun/backend!32

更新了后端的相关内容

See merge request 0010-qingyun/backend!31

修复上一次提交的bug

See merge request 0010-qingyun/backend!30

增加了算法设置选项、token认证、密码加密

See merge request 0010-qingyun/backend!29

更新了后端的readme、格式，采用最新的jar包

See merge request 0010-qingyun/backend!28

修改了backend

See merge request 0010-qingyun/backend!27