那些年的 网络通信之 UDP 数据报包传输---

下面是 一个多线程,基于 UDP 用户数据报包 协议 的 控制台聊天小程序

import java.io.*;
import java.net.*;
class Send implements Runnable{
	  private  DatagramSocket ds;
	  public   DatagramPacket dp;
	  private  byte [] sendBuf;
	  //private  final int port=10086; // Receive Port
	  private  final String ipAddress="192.168.10.1";
	  private  InputStream in=System.in;
	  private  BufferedReader bufr;
	  private  InputStreamReader inpstr;
	  private  String line;

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

	  public void run(){
		  try{
			    bufr=new BufferedReader(new InputStreamReader(in));
					while((line=bufr.readLine())!=null){

						sendBuf=line.getBytes();
						dp=new DatagramPacket(sendBuf,sendBuf.length,InetAddress.getByName(ipAddress),Receive.port);
						ds.send(dp);
						if("end".equalsIgnoreCase(line)) break;

					   }
		  }
		  catch(Exception e){
			  e.printStackTrace();
		  }
		  finally{
			  if(bufr!=null)
			  try{
				    bufr.close();
					bufr=null;
					}
			  catch(IOException ioe){
				  ioe.printStackTrace();
			  }

		  }
	  }

}
class Receive implements Runnable{
	private DatagramSocket ds;
	public static final int port=10087;
	public DatagramPacket dp;
	private InetAddress inetAddress;
	private byte[] receiveBuf=new byte[1024];
	private String receiveMsg;

	public void run(){
		try{
			ds=new DatagramSocket(port);
			while(true){
						dp=new DatagramPacket(receiveBuf,0,receiveBuf.length);
						ds.receive(dp);
						inetAddress=dp.getAddress();
						receiveBuf=dp.getData();
						receiveMsg=new String(receiveBuf,0,dp.getLength());
						if("end".equalsIgnoreCase(receiveMsg)) break;
						System.out.println(inetAddress.getHostAddress()+":"+dp.getPort()+": "+receiveMsg);
			}
		}
		catch(Exception e){
			e.printStackTrace();
		}

	}
}

class ChatDemo{
	 public static void main(String [] args) throws Exception{
				new Thread(new Send(new DatagramSocket(10086))).start();  // send from 10086 port
				new Thread(new Receive()).start();
		}
}

Demo 示例图