首先是要实现ServerSocket的多线程操作；其次，客户端的输入输出流的格式和规范要把握准确；再次，对于广播功能的实现也非常重要，这涉及到了多个线程之间的联系问题-First of all is to realize the multi-threaded operation ServerSocket　Secondly, the client input and output stream format and norms necessary to grasp accurately　again, for the broadcasting function is also important to realize that this involves a number of threads the link between