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我有一个可以托管多个客户端的服务器，以及一个可以连接的客户端。我试图能够选择其中一个客户并说，通过 PrintWriter 向他们发送消息。I 下面的代码仅供参考，甚至可能不需要使用。我只是想知道是否有办法向特定客户而不是所有客户发送消息。我不知道从哪里开始..我可以做服务器到客户端和客户端到服务器，但我希望服务器到客户端的通信被发送到特定的客户端

客户：

    import java.net.Socket;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;

import javax.swing.JOptionPane;

public class Main{
    private static Socket socket;
    private static PrintWriter printWriter;
    private static String inputLine;
    private static Thread thread;

    public static void main(String[] args) {
        // System.out.println("What is the computer's IP address?");
        String Ip_addr = JOptionPane
                .showInputDialog("Enter the IP number of the server to connect: ");
        String IP = Ip_addr;
        while (true) {

            try {
                System.out.println("Client running...");
                socket = new Socket(IP, 8080);
                BufferedReader bufferedReader = new BufferedReader(
                        new InputStreamReader(socket.getInputStream()));
                while ((inputLine = bufferedReader.readLine()) != null) {
                    System.out.println(inputLine);
                    JOptionPane.showMessageDialog(null, inputLine);
                }
            } catch (Exception e) {

            }


        }
    }
}

服务器：

import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;
import java.awt.Desktop;
import java.io.BufferedReader;
import java.io.File;
import java.io.InputStreamReader;
import java.io.IOException;
import java.io.PrintWriter;
public class Main
{
    private static ServerSocket serverSocket;
    private static Socket clientSocket;
    private static BufferedReader bufferedReader;
    private static BufferedReader threadReader;
    private static String inputLine;
    private static Thread thread;
    private static PrintWriter printWriter;
    public static void main(String[] args) throws IOException
    {
        Thread cmd = new Thread(new Commands());
        cmd.start();
        while(ClientThread.Clients < 100) {
            Scanner scan = new Scanner(System.in);
            try
            {
                serverSocket = new ServerSocket(8080);
                clientSocket = serverSocket.accept();
                ClientThread.Clients += 1;

                //Desktop.getDesktop().open(new File("C:/Users/Chris/Desktop/Test.txt")); // Opens notepad on Windows.
                bufferedReader = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));

                printWriter = new PrintWriter(clientSocket.getOutputStream(),true);
            }
            catch(IOException e)
            {
                System.out.println(e.getMessage());
            }
            try{
                thread = new Thread(new ClientThread(clientSocket));
                thread.start();
            }catch(Exception e){System.out.println("Error 103 = failed to create thread."); break;}
            try{
                serverSocket.close();
            }catch(Exception e){System.out.println("Error 105 = failed to close socket.");}

        }


    }
}

多个客户端的线程：

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import java.util.StringTokenizer;

public class ClientThread extends Thread{
    static Socket socket;
    BufferedReader in;
    PrintWriter out;
    String username;
    public static int Clients = 0;
    static String[] Names = new String[100];
    char EOF = (char)0x00;
    public ClientThread(Socket s){
        socket = s;
    }
    public void run(){
        try{
            in = (new BufferedReader(new InputStreamReader(socket.getInputStream())));
            out = new PrintWriter(socket.getOutputStream());
            System.out.println("Client Connected from " + socket.getInetAddress() + ", " + Clients + " connected.");
            Names[Clients-1] = "Client" + (Clients) + " " + socket.getInetAddress();
            in.readLine();
            Thread.sleep(100);
        }catch(Exception e){
            System.out.println(("Client Disconected from " + socket.getInetAddress()));
            removeClient((socket.getInetAddress()).toString());

        }


    }
    private void removeClient(String Inet) {
        int Location;
        String[] Storage = new String[Clients];
        int j = 0;
        for(int i = 0; i < Clients; i++) {
            String line = Names[i];
            StringTokenizer st = new StringTokenizer(line);
            String Name = st.nextToken();
            String IP = st.nextToken();
            if(IP.equalsIgnoreCase(Inet)) {
                //System.out.println("Client removed..");
            }else {
                Storage[j] = Names[i];
                j++;
            }
        }


        for(int i = 0; i < Clients; i++) {
            Storage[i] = Names[i];
        }

        Clients--;

    }
}

任何建议都非常感谢，在此先感谢。

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