Java 两级缓存框架，可以让应用支持两级缓存框架 ehcache(Caffeine) + redis 。避免完全使用独立缓存系统所带来的网络IO开销问题
android IM 聊天（文字、表情、语音） 服务端 客户端齐全 主要技术如下 Spring， hibernate，memcache，Netty，protobuf，FastDFS，GreenDao。
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