Java之UDP传输聊天程序小Demo（多线程）

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ChatDemo.java

import java.net.DatagramSocket;

public class ChatDemo {
    public static void main(String[] args)
    {
        try
        {
            send s = new send(new DatagramSocket());
            receive r = new receive(new DatagramSocket(10000));

            new Thread(s).start();
            new Thread(r).start();
        }
        catch (Exception e){}
    }
}

发送端任务代码：

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;

public class send implements Runnable{
    private DatagramSocket ds;

    public send(DatagramSocket ds){
        this.ds = ds;
    }

    @Override
    public void run() {
        System.out.println("客户端启动......");
        try
        {
            BufferedReader bufreader = new BufferedReader(new InputStreamReader(System.in));
            String line;

            while((line=bufreader.readLine())!=null)
            {
                byte[] buf = line.getBytes();

                DatagramPacket dp = new DatagramPacket(buf,buf.length, InetAddress.getByName("可以填广播地址来群聊"),10000);

                if("q".equals(line))
                {
                    ds.send(dp);
                    break;
                }
                ds.send(dp);
            }
            ds.close();
            bufreader.close();
        }
        catch (Exception e){}
    }
}

接收端任务代码：

import java.net.DatagramPacket;
import java.net.DatagramSocket;

public class receive implements Runnable{
    private DatagramSocket ds;

    public receive(DatagramSocket ds){
        this.ds = ds;
    }

    @Override
    public void run() {
        try
        {
            byte[] buf = new byte[1024];
            DatagramPacket dp = new DatagramPacket(buf,buf.length);

            while(dp!=null)
            {
                ds.receive(dp);

                String ip = dp.getAddress().getHostAddress();
                int port = dp.getPort();
                String data = new String(dp.getData(),0,dp.getLength());

                if("q".equals(data))
                {
                    System.out.println(ip+"退出聊天......");
                    break;
                }

                System.out.println("ip:"+ip);
                System.out.println("port:"+port);
                System.out.println("data:"+data);
                System.out.println();
            }

            ds.close();
        }
        catch (Exception e){}
    }
}