UDP案例体现

package UDP;
import java.io.*;
import java.net.*;

/**
* UDP发送
* @author Administrator
* @param  
*/

public class Send {

public static void main(String arg0[])throws Exception{

DatagramSocket ds=new DatagramSocket(3921);

InputStreamReader isr=new InputStreamReader(System.in);

BufferedReader br=new BufferedReader(isr);

String str="";

do{

str=br.readLine();

byte[] buf=str.getBytes();

int len=buf.length;

System.out.println("发送:"+str);

int port=9300;

InetAddress address=InetAddress.getByName("localhost");

DatagramPacket dp=new DatagramPacket(buf,len,address,port);

ds.send(dp);

}while(!str.equals("end") && !str.equals("END"));

br.close();

isr.close();

ds.close();

}

}

//*****************************************************************************************************************************

package UDP;


import java.net.*;


public class Receive {

/**

* UDP接收

* @param 

*/

public static void main(String[] args)throws Exception{

DatagramSocket ds=new DatagramSocket(9300);

String str="";

int b=2048;

do {

byte[] buf=new byte[b];

int len=buf.length;

DatagramPacket dp=new DatagramPacket(buf,len);

ds.receive(dp);

str=new String(buf,0,dp.getLength());

System.out.println("收到："+str);

} while (!str.equals("end") && !str.equals("END"));

ds.close();

}

}