在Java出现之前，编写多线程程序是一件烦琐且伴随许多不安全因素的事情。利用Java，编写安全高效的多线程程序变得简单，而且利用多线程和Java的网络包我们可以方便的实现多线程服务器程序。-In Java before, the preparation of multi-threaded process is a cumbersome and unsafe factors associated with many things. The use of Java, the preparation of safe and efficient multi-threaded process becomes simple and the use of multi-threading and Java network packages that we can facilitate the realization of multi-threaded server program.