用Socket创建一个聊天窗口

我们将里面的IP地址  例如 192.168.2.143改成192.168.2.255就是将内容发送给192.168.2.（0-254）里面的所有人

package Intnet;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.security.interfaces.DSAKey;

public class Thresend implements Runnable {

	private DatagramSocket send;


	public Thresend(DatagramSocket send) {
		super();
		this.send = send;
	}


	@Override
	public void run() {

		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

		String line = null;
		try {
			while((line = br.readLine()) != null)
			{
				byte buf[] = line.getBytes();
				try {
					DatagramPacket dp = new DatagramPacket(buf, buf.length,InetAddress.getByName("192.168.2.255"),1150);
					send.send(dp);
					if(line.equals("再见臭弟弟"))break;
				} catch (UnknownHostException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}

}


package Intnet;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;

public class Threrece implements Runnable {

	private DatagramSocket rece;



	public Threrece(DatagramSocket rece) {
		super();
		this.rece = rece;
	}



	@Override
	public void run() {
		// TODO Auto-generated method stub

		while(true)
		{
			byte buf[] = new byte [1024];
			DatagramPacket dp = new DatagramPacket(buf, buf.length);
			try {
				rece.receive(dp);
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}

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

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

		}
	}

}


package Intnet;

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

public class Thredemo {

	public static void main(String[] args) throws Exception {
		// TODO Auto-generated method stub
		DatagramSocket send = new DatagramSocket();
		DatagramSocket rece = new DatagramSocket(1150);

		Thresend s = new Thresend(send);
		Threrece r = new Threrece(rece);

		new Thread(s).start();
		new Thread(r).start();

	}

}