jdk供的无阻塞I/O（NIO）有效解决了多线程服务器存在的线程开销问题，但在使用上略显得复杂一些。在NIO中使用多线程，主要目的已不是为了应对每个客户端请求而分配独立的服务线程，而是通过多线程充分使用用多个CPU的处理能力和处理中的等待时间，达到提高服务能力的目的。

client多线程请求server端，server接收client的名字，并返回Hello! ＋名字的字符格式给client。当然实际应用并不这么简单，实际可能是访问文件或者数据库获取信息返回给client。-jdk for non-blocking I/O (NIO), an effective solution to the problem of multi-threaded server thread overhead, but too complicated to use minor. To use multiple threads, the main purpose is not to respond to each client request to allocate a separate service thread with multiple CPU processing power and processing wait time, but fully multi-threaded so as to enhance service capabilities in the NIO purpose. This time in the NIO, to write an article blog to remember the things you learned. Or from the most simple Hello World, multi-threaded the client requests the server side, the server receiving the client　s name, and return to the Hello!+ The name of the character format to the client. Of course, the practical application is not so simple, the actual access to the file or database to obtain the information returned to the client. The non-blocking NIO What is the mystery?