{
try
{
DatagramSocket ds = new DatagramSocket();
String str = "haha, my name is xuneng!";
DatagramPacket dp = new DatagramPacket(str.getBytes(),0,str.length(),
InetAddress.getByName("localhost"),8600);//发送给本机的地址，端口为8600
ds.send(dp);
//演示接受返回回来的数据。
byte[] buf = new byte[100];
DatagramPacket dp2 = new DatagramPacket(buf,100);//字节数组，长度
ds.receive(dp2);
System.out.println(new String(buf,0,dp2.getLength()));
ds.close();
}
catch(Exception e)
{
e.printStackTrace();
}
}
}
接收代码如下：
[java]
import java.net.*;
import java.io.*;
/*
*接受端，也就是服务器端。一直在监听端口。
*/
class SocketUDPRecv
public static void main(String[]args)
{
recv();
}
public static void recv()
{
try
{
DatagramSocket ds = new DatagramSocket(8600);
byte [] buf = new byte[100];
DatagramPacket dp = new DatagramPacket(buf,100);
ds.receive(dp);
System.out.println(new String(buf,0,dp.getLength()));
//演示给发送端返回数据,需要发送端去接受
String str = "Yes , I received!";
DatagramPacket dp1 = new DatagramPacket(str.getBytes(),str.length(),
dp.getAddress(),dp.getPort());
ds.send(dp1);
ds.close();
}
catch(Exception e)
{
e.printStackTrace();
}
}
}