example9_5.java

来自「书中的例题」· Java 代码 · 共 33 行

/* 数据发送方 */
import java.net.*;
public class UdpSend
{
	public static void main(String[] args) throws Exception 
	{
       DatagramSocket ds=new DatagramSocket();
	   String str="hello,world";
	   DatagramPacket dp=new DatagramPacket(str.getBytes(), str.length(),
			InetAddress.getByName("127.0.0.1"),4321);
		ds.send(dp);
		ds.close();
	}
}

/* 数据接收方 */
import java.net.*;
public class UdpRecv
{
	public static void main(String[] args) throws Exception
	{
		DatagramSocket ds=new DatagramSocket(4321);
		byte[] buf=new byte[1024];
		DatagramPacket dp=new DatagramPacket(buf,1024);
		ds.receive(dp);
		String strRecv=new String(dp.getData(),0,dp.getLength())+
			  "from"+dp.getAddress().getHostAddress()+":"+dp.getPort();
		System.out.println(strRecv);
		ds.close();
	}
}