Java by API/java.net/DatagramPacket

DatagramPacket: getAddress()

   <source lang="java">

/*

* Output:
*  
*/

import java.net.DatagramPacket; import java.net.DatagramSocket; import java.net.InetAddress; public class MainClass {

 private final static int BUFSIZE = 20;
 public static void main(String args[]) {
   try {
     int port = 80;
     DatagramSocket ds = new DatagramSocket(port);
     byte buffer[] = new byte[BUFSIZE];
     while (true) {
       DatagramPacket dp = new DatagramPacket(buffer, buffer.length);
       // Receive data
       ds.receive(dp);
       // Display address from the datagram packet
       InetAddress ia = dp.getAddress();
       System.out.println(ia);
       // Display port from the datagram packet
       System.out.println(dp.getPort());
     }
   } catch (Exception e) {
     e.printStackTrace();
   }
 }

}

      </source>
   
  
 
  

DatagramPacket: getData()

   <source lang="java">

import java.io.IOException; import java.net.DatagramPacket; import java.net.DatagramSocket; import javax.swing.JPanel; public class MainClass extends JPanel {

 public static void main(String[] args) {
   try {
     byte[] buffer = new byte[1024];
     DatagramPacket packet = new DatagramPacket(buffer, buffer.length);
     DatagramSocket socket = new DatagramSocket(5002);
     System.out.println("Waiting for a packet...");
     socket.receive(packet);
     System.out.println("Just received packet from " + packet.getSocketAddress());
     buffer = packet.getData();
     System.out.println(new String(buffer));
   } catch (IOException e) {
     e.printStackTrace();
   }
 }

}

      </source>
   
  
 
  

DatagramPacket: getPort()

   <source lang="java">

/*

* Output:
*  
*/

import java.net.DatagramPacket; import java.net.DatagramSocket; import java.net.InetAddress; public class MainClass {

 private final static int BUFSIZE = 20;
 public static void main(String args[]) {
   try {
     int port = 80;
     DatagramSocket ds = new DatagramSocket(port);
     byte buffer[] = new byte[BUFSIZE];
     while (true) {
       DatagramPacket dp = new DatagramPacket(buffer, buffer.length);
       // Receive data
       ds.receive(dp);
       // Display address from the datagram packet
       InetAddress ia = dp.getAddress();
       System.out.println(ia);
       // Display port from the datagram packet
       System.out.println(dp.getPort());
     }
   } catch (Exception e) {
     e.printStackTrace();
   }
 }

}

      </source>
   
  
 
  

DatagramPacket: getSocketAddress()

   <source lang="java">

import java.io.IOException; import java.net.DatagramPacket; import java.net.DatagramSocket; import javax.swing.JPanel; public class MainClass extends JPanel {

 public static void main(String[] args) {
   try {
     byte[] buffer = new byte[1024];
     DatagramPacket packet = new DatagramPacket(buffer, buffer.length);
     DatagramSocket socket = new DatagramSocket(5002);
     System.out.println("Waiting for a packet...");
     socket.receive(packet);
     System.out.println("Just received packet from " + packet.getSocketAddress());
     buffer = packet.getData();
     System.out.println(new String(buffer));
   } catch (IOException e) {
     e.printStackTrace();
   }
 }

}

      </source>
   
  
 
  

new DatagramPacket(byte[] buffer, int bufferLength)

   <source lang="java">

/*

* Output:
*  
*/

import java.net.DatagramPacket; import java.net.DatagramSocket; public class MainClass {

 private final static int BUFSIZE = 20;
 public static void main(String args[]) {
   try {
     int port = 80;
     DatagramSocket ds = new DatagramSocket(port);
     while (true) {
       byte buffer[] = new byte[BUFSIZE];
       DatagramPacket dp = new DatagramPacket(buffer, buffer.length);
       ds.receive(dp);
       String str = new String(dp.getData());
       System.out.println(str);
     }
   } catch (Exception e) {
     e.printStackTrace();
   }
 }

}

      </source>
   
  
 
  

new DatagramPacket(byte[] buf, int length, InetAddress address, int port)

   <source lang="java">

/*

* Output:
*  
*/

import java.net.DatagramPacket; import java.net.DatagramSocket; import java.net.InetAddress; public class MainClass {

 public static void main(String args[]) {
   try {
     InetAddress ia = InetAddress.getByName("www.jexp.ru");
     DatagramSocket ds = new DatagramSocket();
     byte buffer[] = "hello".getBytes();
     DatagramPacket dp = new DatagramPacket(buffer, buffer.length, ia, 80);
     // Send the datagram packet
     ds.send(dp);
   } catch (Exception e) {
     e.printStackTrace();
   }
 }

}

      </source>