Java网络编程实现多线程聊天

本文实例为大家分享了Java网络编程实现多线程聊天的具体代码，供大家参考，具体内容如下

聊天程序如果是单线程，会导致没人只能说一句，并且说了以后，必须等到另一个人的回复，才能说第二句。收发都在主线程中，不能同时进行。

解决方法：

将收发放到两个不同的线程

1. SendThread 发送消息线程
2. RecieveThread 接受消息线程
3. Server一旦接受到连接，就启动收发两个线程
4. Client 一旦建立了连接，就启动收发两个线程

多线程聊天

1 SendThread

package socket;

import java.io.DataOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.Socket;
import java.util.Scanner;

public class SendThread extends Thread {
    private Socket s;
    public SendThread(Socket s) {
        this.s = s;
    }
    @Override
    public void run() {
        try {
            OutputStream os = s.getOutputStream();
            DataOutputStream dos = new DataOutputStream(os);
            while(true){
                Scanner sc = new Scanner(System.in);
                String str = sc.next();
                dos.writeUTF(str);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

2 RecieveThread

package socket;

import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.Socket;

public class RecieveThread extends Thread {
    private Socket s;
    public RecieveThread(Socket s) {
        this.s = s;
    }
    @Override
    public void run() {
        InputStream is = null;
        try {
            is = s.getInputStream();
            DataInputStream dis = new DataInputStream(is);
            while(true){
                String msg = dis.readUTF();
                System.out.println(msg);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

}

3 Server

package socket;

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

public class Server {
    public static void main(String[] args) {
        try {
            ServerSocket ss = new ServerSocket(8888);
            System.out.println("监听端口号：8888");
            Socket s = ss.accept();

            new SendThread(s).start();
            new RecieveThread(s).start();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

4 Client

package socket;

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

public class Client {
    public static void main(String[] args) {
        try {
            Socket s = new Socket("127.0.0.1", 8888);

            new SendThread(s).start();
            new RecieveThread(s).start();
        } catch (UnknownHostException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

简单对话框

Server

package socket;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.net.ServerSocket;
import java.net.Socket;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTextArea;
import javax.swing.JTextField;

public class GUIServer {

    public static void main(String[] args) throws Exception {

        JFrame f = new JFrame();
        f.setTitle("server");

        f.setSize(400, 300);
        f.setLocation(100, 200);
        f.setLayout(null);

        JButton b = new JButton("send");
        b.setBounds(10, 10, 80, 30);
        f.add(b);

        final JTextField tf = new JTextField();
        tf.setBounds(10, 110, 80, 30);
        f.add(tf);

        final JTextArea ta = new JTextArea();
        ta.setBounds(110,10, 200, 300);
        f.add(ta);

        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setVisible(true);

        ServerSocket ss = new ServerSocket(8888);

        System.out.println("listenning on port:8888");
        final Socket s =  ss.accept();
        new Thread() {
            public void run() {
                while (true) {
                    try {
                        DataInputStream dis = new DataInputStream(
                                s.getInputStream());
                        String text = dis.readUTF();
                        ta.append(text+"\r\n");
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }

            }
        }.start();

        b.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {

                String text = tf.getText();
                ta.append(text+"\r\n");

                try {
                    DataOutputStream dos = new DataOutputStream(
                            s.getOutputStream());
                    dos.writeUTF(text);
                } catch (Exception ex) {
                    ex.printStackTrace();
                }
            }
        });

    }
}

Client

package socket;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.net.Socket;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTextArea;
import javax.swing.JTextField;

public class GUIClient {

    public static void main(String[] args) throws Exception {

        JFrame f = new JFrame();
        f.setTitle("client");

        f.setSize(400, 300);
        f.setLocation(600, 200);
        f.setLayout(null);

        JButton b = new JButton("send");
        b.setBounds(10, 10, 80, 30);
        f.add(b);

        final JTextField tf = new JTextField();
        tf.setBounds(10, 110, 80, 30);
        f.add(tf);

        final JTextArea ta = new JTextArea();
        ta.setBounds(110,10, 200, 300);
        f.add(ta);

        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setVisible(true);

        final Socket s = new Socket("127.0.0.1", 8888);

        new Thread() {
            public void run() {
                while (true) {
                    try {
                        DataInputStream dis = new DataInputStream(
                                s.getInputStream());
                        String text = dis.readUTF();
                        ta.append(text+"\r\n");
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }

            }
        }.start();

        b.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {

                String text = tf.getText();
                ta.append(text+"\r\n");

                try {
                    DataOutputStream dos = new DataOutputStream(
                            s.getOutputStream());
                    dos.writeUTF(text);
                } catch (Exception ex) {
                    ex.printStackTrace();
                }
            }
        });

    }
}

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