按照Broker模式的要求，实现Client，Broker，Server三种组件(设计为三个class)，不要求设计Client-side Proxy和Server-side Proxy。必须实现如下功能：

• 　　 Server可以注册到Broker（使用ID号）

• 　　 Broker为Server提供注册服务

• 　　 Broker可将client的request转发到正确的server

• 　　 Broker可见server的response转发到client -Broker with the requirements of the model and realize Client, Broker, Server three components (design for the three class), does not require Design Client-side and Proxy Server-side Proxy. The need to achieve the following functions : # 8226 Server can be registered to Broker (use ID) # 8226 Server Broker to provide registration services # 8226 Broker can be transmitted client's request to the correct server # 8226 Broker Visibility server response relayed to the client