udpsend.java

ＵＤＰ编程例子．采用ＪＡＶＡ 网络编程．

import java.net.*;
public class UdpSend 
{
	public static void main(String[] args) throws Exception
	{
		DatagramSocket ds=new DatagramSocket();  //由于是发送数据，所以采用DatagramSocket()不带参数的构造函数，端口号由系统自动分配
		InetAddress ad= InetAddress.getLocalHost();
		System.out.println("Binding to a Local port:"+ds.getLocalPort());  //查看系统自动分配的端口号
		System.out.println("The local IP is:"+ad.getHostAddress());
		
		String strInfo="This is the UDP test!!"; //要发送的字符串数据
		byte[] buf=strInfo.getBytes();  //将字符串转换为字节数组
		int len=strInfo.length();  //获取字符串长度
		InetAddress addr=InetAddress.getByName("222.212.218.15");
		
		DatagramPacket dp=new DatagramPacket(buf,len,addr,3000); //生成Packet对象
		ds.send(dp);
		ds.close();
		

	
	}

}