如何使用TCP连接同时接受多个客户端？

Question

I have a Server that create a TCP connection via Socket with a Client. Since my app should be a Chat I need the server to accept multiple clients simultaneously using the same port, so that they can comunicate in real-time. My Server-side is a Java application, my Client-side is an Android app.

Is possible to do something like this? If yes how can I do it?

This is my server code:

public class Server {

public static void main(String[] args){

    ServerClass server = new ServerClass();
    server.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    server.inizia();
     }
}




public class ServerClass extends JFrame {

JTextArea testoarea;
String messaggio;
ObjectOutputStream output;
DataInputStream input;
ServerSocket server;
Socket connessione;

public ServerClass(){
    super("Server in Ascolto");
    testoarea = new JTextArea();
    add(new JScrollPane(testoarea));
    setSize(600, 700);
    setVisible(true);


}
public void inizia()
{
    try {

        server = new ServerSocket(7100);
        while(true)
        {
            try {

                iniziaConnessione();
                sistemaCanali();
                chatta();
                //closeCrap();

            } catch (EOFException eofException) {
                // TODO: handle exception
                showMessage("Il Server ha perso la connessione..\n");
            }
        }
    } catch (IOException ioException) {
        // TODO: handle exception
        ioException.printStackTrace();
    }


}

private void iniziaConnessione() throws IOException {
    // TODO Auto-generated method stub
    showMessage("Aspetto qualcuno per connettermi.... \n");
    connessione = server.accept();
    showMessage("Mi sono connesso a qalcuno... \n");

}

private void sistemaCanali() throws IOException {
    // TODO Auto-generated method stub
    output = new ObjectOutputStream(connessione.getOutputStream());
    output.flush();
    input = new DataInputStream(connessione.getInputStream());
    showMessage("I canali sono apposto...  \n");
}


private void chatta() throws IOException {
    // TODO Auto-generated method stub

    String messaggio = "Sei connesso e pronto a chattare... \n";
    showMessage(messaggio);
    messaggio = (String) input.readUTF();
    showMessage("Client - " + messaggio);
    sendData(messaggio);


}
private void sendData(String messaggio2) {
    // TODO Auto-generated method stub
    try {
        output.writeUTF(messaggio2);
        output.flush();

    } catch (IOException e) {
        // TODO Auto-generated catch block
        showMessage("ERRORE: non riesco a inviare il messaggio...  \n");
    }
}
private void showMessage(final String text) {
    // TODO Auto-generated method stub
    SwingUtilities.invokeLater(
                new Runnable() {
                    public void run() {
                        testoarea.append(text);
                    }
                }
            );
} 


}

Answer 1

Once you have accepted a client, use another thread to manage the comunications with it. Don't manage your communications in the same thread that that running your accept() loop. Your client thread(s) can then pass data back and forth between the clients as needed, without interfering with the server's ability to accept new clients at the same time.