JAVA_UDP_ChatUDP

最新推荐文章于 2025-12-16 16:02:25 发布

转载最新推荐文章于 2025-12-16 16:02:25 发布 · 124 阅读

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CC 4.0 BY-SA版权

原文链接：https://my.oschina.net/u/2363350/blog/668759

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#java #网络

本文介绍了一个基于UDP协议的实时聊天应用，通过创建一个客户端界面，实现了消息的发送和接收功能。程序通过监听特定端口接收来自不同IP地址的消息，并将其显示在列表中。同时，用户可以输入消息并发送到指定的服务器端口。

Code

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;

/**
 * Created by linux_ccmj on 16-5-1.
 */
public class ChatUDP extends JFrame {

    /* Message list, IP, Message sending, Socket */
    List lis = new List(6);                 /* Message line */
    TextField texIp = new TextField(15);    /* IP address */
    TextField texMesFie = new TextField(20);   /* Message for sending */
    DatagramSocket socDat = null;               /* Socket */

    /* ChatUDP */
    public ChatUDP(){
        /* Socket, Message list, Panel */
        try {
            socDat = new DatagramSocket(3000);
        }
        catch (Exception e){
            e.printStackTrace();
        }
        this.add(lis,"Center");
        Panel pan = new Panel();
        this.add(pan,"South");

        /* IP, Message sending */
        pan.setLayout(new BorderLayout());
        pan.add(texIp,"West");
        pan.add(texMesFie,"East");

        /* Message text receiving thread */
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    byte [] bufRec = new byte[1024];
                    DatagramPacket pacDatRec = new DatagramPacket(bufRec, 1024);
                    while (true){
                        socDat.receive(pacDatRec);
                        lis.add(new String(bufRec, 0, pacDatRec.getLength())
                                + " from " + pacDatRec.getAddress().getHostAddress() + ": "
                                + pacDatRec.getPort(),0);
                    }
                }
                catch (Exception e){
                    if (!socDat.isClosed()){
                        e.printStackTrace();
                    }

                }


            }
        }).start();

        /* Message text action */
        texMesFie.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                /* Message sending */
                try {
                    byte [] buf = null;
                    buf = texMesFie.getText().getBytes();
                    DatagramPacket pacDat = new DatagramPacket(buf, buf.length,
                            InetAddress.getByName(texIp.getText()),3000);
                    socDat.send(pacDat);
                }
                catch (Exception e1){
                    e1.printStackTrace();
                }
                /* Clean text */
                texMesFie.setText("");
            }
        });


        /* Closing */
        addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                socDat.close();
                dispose();
                System.exit(0);
            }
        });
    }

    /* Main */
    public static void main(String[] args) {
        ChatUDP chaWin = new ChatUDP();
        chaWin.setSize(305,300);
        chaWin.setTitle("Chat");
        chaWin.setVisible(true);
        chaWin.setResizable(false);     /* Can not change the size */
    }
}

2. Demo