[2-1 Socket家族的基石](Socket%E5%AE%B6%E6%97%8F%E7%9A%84%E5%9F%BA%E7%9F%B3.md) [2-2 byte数组基础](byte%E6%95%B0%E7%BB%84%E5%9F%BA%E7%A1%80.md) [2-3 缓冲区基础](%E7%BC%93%E5%86%B2%E5%8C%BA%E5%9F%BA%E7%A1%80.md) [2-4 NIO Socket通讯的工作原理](NIOSocket%E9%80%9A%E8%AE%AF%E7%9A%84%E5%B7%A5%E4%BD%9C%E5%8E%9F%E7%90%86.md)