IM学习目录

1. 浅谈即时通讯 https://www.cnblogs.com/shoshana-kong/p/9724963.html

2. im即时通讯  https://www.cnblogs.com/shoshana-kong/p/9724945.html

3. java socket 模拟im 即时通讯  https://www.cnblogs.com/shoshana-kong/p/9724982.html