基于Java网络编程和多线程的多对多聊天系统

package netProgram;

import java.io.IOException;
import java.net.Socket;
import java.net.SocketAddress;

public class Client implements ScreenInputInterface{
    private SocketHandler socketHandler;

    public void start(){
        new Thread(new ScreenInputRunIns(this)).start();
        try {
            socketHandler =   new SocketHandler(new Socket("127.0.0.1",666),null);
            new Thread(socketHandler).start();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void send(String msg) {
        socketHandler.sendMsg(msg);
    }

    
}

package netProgram;

import java.io.IOException;
import java.net.ServerSocket;
import java.net.SocketAddress;
import java.util.ArrayList;
import java.util.List;

public class Server implements ScreenInputInterface{
    private List<SocketHandler> clients = new ArrayList<>();
    private ServerSocket serverSocket;

    public void start(){
//        new Thread(new ScreenInputRunIns(this)).start();
        try {
            serverSocket = new ServerSocket(666);
            while (true){
                SocketHandler socketHandler = new SocketHandler(serverSocket.accept(),this);
                clients.add(socketHandler);
                System.out.println(socketHandler.getSocket().getRemoteSocketAddress()+"进入聊天系统");
                new Thread(socketHandler).start();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void send(String msg) {
        for (SocketHandler s:clients) {
            s.sendMsg(msg);
        }
    }

    

    public static void main(String[] args) {
        new Server().start();
    }
}

package netProgram;

import java.net.SocketAddress;

public interface ScreenInputInterface {
    void send(String msg);
//    void send(String msg, SocketAddress address);
}

package netProgram;

import java.util.Scanner;

public class ScreenInputRunIns implements Runnable{
    private ScreenInputInterface screenInputInterface;
    private Scanner input = new Scanner(System.in);

    public ScreenInputRunIns(ScreenInputInterface screenInputInterface) {
        this.screenInputInterface = screenInputInterface;
    }

    @Override
    public void run() {//屏幕实时输入
        while (true){
            String msg = input.nextLine();
//            screenInputInterface.send(msg,null);
            screenInputInterface.send(msg);
        }
    }
}

package netProgram;

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

public class SocketHandler implements Runnable{
    private String clientName;
    private Socket socket;
    private PrintWriter writer;
    private Server server;

    public SocketHandler(Socket socket,Server server) throws IOException {
        this.socket = socket;
        this.server = server;
        clientName  = "<"+socket.getLocalSocketAddress()+">";
        writer = new PrintWriter(this.socket.getOutputStream());
    }

    public Socket getSocket() {
        return socket;
    }

    public void sendMsg(String msg){
        if (server!=null) writer.println(msg);
        else writer.println(clientName+":"+msg);
        writer.flush();
    }

    @Override
    public void run() {
        while(true){//监听输入流的输入
            try {
                BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
                String receiveMsg = null;
                System.out.println();
                if ((receiveMsg = reader.readLine())!=null&&!(receiveMsg.equals(""))){
                    if (server!=null){
//                        server.send(receiveMsg,socket.getRemoteSocketAddress());
                        server.send(receiveMsg);
                    }else {
                        System.out.println(receiveMsg);
                    }
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

package netProgram;

public class ClientLinked {
    public static void main(String[] args) {
        new Client().start();
    }
}

package netProgram;

public class ClientLinked1 {
    public static void main(String[] args) {
        new Client().start();
    }
}

package netProgram;

public class ClientLinked2 {
    public static void main(String[] args) {
        new Client().start();
    }
}