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Problem Overview

Implement the EchoServer and EchoClient classes, where EchoServer listens on a port number (passed through parameters when it starts) and waits for client access; EchoClient connects to the server based on the incoming server address (IP address or domain name) and port number at startup; After connecting, read the user's input on the command line and transfer the input to EchoServer. After EchoServer is received, return EchoServer received: + user input information; EchoClient receives the return message and outputs it to the command line, and continues. Waiting for user input

1, the client code


2. Single-threaded server-side code

3, multi-threaded server-side code



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