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服务端，创建一个DatagramSocket对象，侦听在某个端口，创建一个DatagramPacket对象接受数据。收到客户端发来的信息后，有原封不动转发到客户端。
public class DatagramServerTest {
public static void main(String[] args) throws IOException {
byte[] buf = new byte[1024];
DatagramPacket packet = new DatagramPacket(buf, 1024);
DatagramSocket server = new DatagramSocket(9000); //侦听本机9000端口UDP数据包
server.receive(packet);
String str = new String(buf,0,packet.getLength());
System.out.println("server get msg -> "+packet.getAddress().getHostName()+":"+str);
server.send(new DatagramPacket(buf,packet.getLength(),packet.getAddress(),packet.getPort()));
server.close();
}
}
客户端，创建一个DatagramSocket对象和一个DatagramPacket对象（包含目的主机的端口号9000和IP地址），调用send方法，发送数据.然后调用receive接受服务器的回传@
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
import java.net.UnknownHostException;
public class DatagramClientTest {
public static void main(String[] args) throws IOException {
//创建UDP的Socket
InetAddress serverAddr = InetAddress.getByName("192.168.0.101"); //目的主机IP地址
DatagramSocket client = new DatagramSocket();//本地端口随机，直接创建DatagramSocket
String str = "hello world, from " + InetAddress.getLocalHost().getHostName();
DatagramPacket packet = new DatagramPacket(str.getBytes(), str.length(), serverAddr, 9000); //目的主机端口号9000
client.send(packet);
byte[] buf = new byte[1024];
DatagramPacket pkt = new DatagramPacket(buf,1024);
client.receive(pkt);
String str1 = new String(buf,0,pkt.getLength());
System.out.println("client get -> "+packet.getAddress().getHostName()+":"+str1);
client.close();
}
}
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原文地址：http://www.cnblogs.com/fangying7/p/4676741.html
