udpclient.java

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// 例8.3.3 UDPClient.java
import java.net.DatagramSocket;
import java.net.UnknownHostException;
import java.net.DatagramPacket;
import java.io.IOException;
import java.net.InetAddress;
import java.net.SocketException;

public class UDPClient
{
	public static void main(String[] args)
	{
		try
		{
			//创建一个DatagramSocket对象,抛出SocketException
			DatagramSocket datagramSocket = new DatagramSocket(); 

			//生成消息字符串
			String string = "Hello NetWork Programing";

// 把消息转换成字节放进字节缓冲区中,同时指定了消息发送的目的
// 抛出UnknownHostException
			DatagramPacket datagramPacket = new DatagramPacket(string.getByte
s(),string.length(), InetAddress.getByName("localhost"), 8080);
			
			// 将生成的数据报发送到数据报套接字中,抛出IOException
			datagramSocket.send(datagramPacket);
			
			// 关闭数据报套接字,抛出IOException
			datagramSocket.close();
		} catch (SocketException es) {
			es.printStackTrace();
		} catch (UnknownHostException eu) {
			eu.printStackTrace();
		} catch (IOException ex) {
			ex.printStackTrace();
		}
	}
}