2.基于非连接的数据报编程

发送方向接收方发送了一个"hello world"的数据包，接收方接收该数据报。

1.发送方

package javase.net.socket;

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


public class UDPClient {

	public static void main(String[] args) {
		try {
			byte[] buf = "hello world".getBytes();
			DatagramPacket dp = new DatagramPacket(buf, buf.length,
                                new InetSocketAddress("127.0.0.1", 8888));
			DatagramSocket ds = new DatagramSocket(9999);
			ds.send(dp);
			ds.close();
		} catch (SocketException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}

 

2.接收方

 

package javase.net.socket;

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

public class UDPServer {

	public static void main(String[] args) {
		try {
			byte[] buf = new byte[1024];
			DatagramPacket dp = new DatagramPacket(buf, buf.length);
			DatagramSocket ds = new DatagramSocket(8888);
			while (true) {
				ds.receive(dp);
				System.out.println(new String(buf, 0, dp.getLength()));
			}
		} catch (SocketException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}