public static void main(String[] args) throws IOException {
    String hostName = "127.0.0.1";
    int portNumber = 4848;
    Socket echoSocket = new Socket(hostName, portNumber);
    PrintWriter out = new PrintWriter(echoSocket.getOutputStream(), true);
    BufferedReader in = new BufferedReader(new InputStreamReader(echoSocket.getInputStream()));
    BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in));
    String userInput;
    while ((userInput = stdIn.readLine()) != null) {
        out.println(userInput);
        System.out.println("echo: " + in.readLine());
    }
}

echo: null .

输入

输出

现实

回声:空

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