java基础学习笔记——网络UDP/聊天

package ownerSocket;

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

public class ChartDemo {

	/**
	 * @param args
	 * @throws SocketException 
	 */
	public static void main(String[] args) throws SocketException {
		// TODO Auto-generated method stub
		DatagramSocket send = new DatagramSocket();
		DatagramSocket receive = new DatagramSocket(10003);
		new Thread(new SendDemo(send)).start();
		new Thread(new ReceiverDemo(receive)).start();
	}

}

package ownerSocket;

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

public class SendDemo implements Runnable {

	private DatagramSocket ds;
	
	public SendDemo(DatagramSocket ds) {
		super();
		this.ds = ds;
	}

	public void run() {
		// TODO Auto-generated method stub
		BufferedReader bufr = new BufferedReader(new InputStreamReader(System.in));
		String line = null;
		try{
			while((line=bufr.readLine())!=null)
			{
				byte[] b = line.getBytes();
				DatagramPacket dp = new DatagramPacket(b, b.length,InetAddress.getByName("lenovo-PC"),10003);
				ds.send(dp);
			}
			ds.close();
			
		}catch(Exception e){}

	}

}

package ownerSocket;

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

public class ReceiverDemo implements Runnable {

	private DatagramSocket ds;
	
	public ReceiverDemo(DatagramSocket ds) {
		super();
		this.ds = ds;
	}

	public void run() {
		// TODO Auto-generated method stub
		
		try{
			while(true){
				byte[] buf = new byte[1024];
				DatagramPacket dp = new DatagramPacket(buf, buf.length);
				ds.receive(dp);
				String ip = dp.getAddress().getHostAddress();
				int port = dp.getPort();
				String content = new String(dp.getData(),0,dp.getLength());
				System.out.println("ip:"+ip+" port:"+port+"  content:"+content);
				if(content.equals("88")){
					System.out.println(ip+"退出聊天....");
				}
			}
			
		}catch(Exception e){}

	
	}

}