Java实现UDP互发消息

package udp;
/**
UDP发送端
*/
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("发送方启动中......");
  //使用DatagramSocket指定端口，创建发送端
  DatagramSocket client = new DatagramSocket(8888);
  //准备数据，转换为字节数组
  String data ="帅哥";
  byte[] datas = data.getBytes();
  //封装成DatagramPacket包裹，需要指定目的地
  DatagramPacket packet = new DatagramPacket(datas,0,datas.length,new InetSocketAddress("localhost",9999));
  //发送包裹send(DatagramPacket p)
  client.send(packet);
  //释放资源
  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("接收方启动中......");
  //使用DatagramSocket指定端口创建接收端，端口值要与客户端的发送包裹一致
  DatagramSocket server =new DatagramSocket(9999);
  //准备容器封装成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();
 }
}