Go语言（服务器开发）：简易TCP客户端与服务端

Go语言具备强大的服务器开发支持，本文示范了最基础的服务器开发：通过TCP协议实现客户端与服务器的通讯。

一 服务端，为每个客户端新开一个goroutine

func ServerBase() {
	fmt.Println("Starting the server...")
	//create listener
	listener, err := net.Listen("tcp", "192.168.1.27:50000")
	if err != nil {
		fmt.Println("Error listening:", err.Error())
		return
	}

	// listen and accept connections from clients:
	for {
		conn, err := listener.Accept()
		if err != nil {
			fmt.Println("Error accepting:", err.Error())
			return
		}
		//create a goroutine for each request.
		go doServerStuff(conn)
	}

}

func doServerStuff(conn net.Conn) {
	fmt.Println("new connection:", conn.LocalAddr())
	for {
		buf := make([]byte, 1024)
		length, err := conn.Read(buf)
		if err != nil {
			fmt.Println("Error reading:", err.Error())
			return
		}

		fmt.Println("Receive data from client:", string(buf[:length]))
	}
}

二 客户端 连接服务器，并发送数据

func ClientBase() {
	//open connection:
	conn, err := net.Dial("tcp", "192.168.1.27:50000")
	if err != nil {
		fmt.Println("Error dial:", err.Error())
		return
	}

	inputReader := bufio.NewReader(os.Stdin)
	fmt.Println("Please input your name:")
	clientName, _ := inputReader.ReadString('\n')
	inputClientName := strings.Trim(clientName, "\n")

	//send info to server until Quit
	for {
		fmt.Println("What do you send to the server? Type Q to quit.")
		content, _ := inputReader.ReadString('\n')
		inputContent := strings.Trim(content, "\n")
		if inputContent == "Q" {
			return
		}

		_, err := conn.Write([]byte(inputClientName + " says " + inputContent))
		if err != nil {
			fmt.Println("Error Write:", err.Error())
			return
		}
	}
}

注：由于LiteIDE不支持同时运行多个程序，所以需要在终端通过 go run 命令来同时运行服务端和（一个或多个）客户端，可观察到服务器对并发访问的支持。

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