package udp;
/**
UDP發(fā)送端
*/
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetSocketAddress;

public class UdpClient {
 public static void main(String[] args) throws IOException {
  System.out.println("發(fā)送方啟動中......");
  //使用DatagramSocket指定端口，創(chuàng)建發(fā)送端
  DatagramSocket client = new DatagramSocket(8888);
  //準備數(shù)據(jù)，轉(zhuǎn)換為字節(jié)數(shù)組
  String data ="帥哥";
  byte[] datas = data.getBytes();
  //封裝成DatagramPacket包裹，需要指定目的地
  DatagramPacket packet = new DatagramPacket(datas,0,datas.length,new InetSocketAddress("localhost",9999));
  //發(fā)送包裹send(DatagramPacket p)
  client.send(packet);
  //釋放資源
  client.close();
 }
}

package udp;
/**
UDP接收端
*/
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;

public class UdpServer {
 public static void main(String[] args) throws IOException {
  System.out.println("接收方啟動中......");
  //使用DatagramSocket指定端口創(chuàng)建接收端，端口值要與客戶端的發(fā)送包裹一致
  DatagramSocket server =new DatagramSocket(9999);
  //準備容器封裝成DatagramPacket包裹
  byte[] container = new byte[1024*60];
  DatagramPacket packet = new DatagramPacket(container,0,container.length);
  //阻塞式
  server.receive(packet);
  byte[] datas = packet.getData();
  int len=packet.getLength();
  System.out.println(new String(datas,0,len));
  server.close();
 }
}