TCP的Socket通信
TCP是面向连接的，安全的协议，它是一对一的关系
server
client
上面只是单个客户端同服务器通信，可使用多线程编程实现多个客户端的通信
UDP的Socket通信
udp是面向无连接的，不安全，不可靠的，但是效率很高，支持一对一，一对多，多对多发送，udp传输的格式为数据报，要将其封装为数据报才能发送，
server
client
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