Java- Datagram Socket class & Datagram Packet class
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The document provides an overview of the Datagram Socket and Datagram Packet classes in Java, which are used for communication over the UDP protocol. It describes the characteristics of these classes, including constructors for creating Datagram Sockets and Packets, as well as examples of how to send and receive datagrams. Key points include the connection-less nature of the sockets and the lack of delivery guarantees for the packets.
![Datagram Packet class
• Commonly used constructors:
• DatagramPacket(byte data[ ], int size): This constructor is used to receive the
packets
• DatagramPacket(byte data[ ], int size, InetAddress ipAddress, int port): This
constructor is used to send the packets
Ruchi Maurya](https://image.slidesharecdn.com/java-170513133320/85/Java-Datagram-Socket-class-Datagram-Packet-class-7-320.jpg)
![Example: Sending datagramPacket by DatagramSocket
import java.net.*;
public class Dsender
{
public static void main(String[] args) throws Exception
{
DatagramSocket ds = new DatagramSocket();
String str = "Welcome java";
InetAddress ip = InetAddress.getByName("127.0.0.1");
DatagramPacket dp = new DatagramPacket(str.getBytes(), str.length(), ip, 3000);
ds.send(dp);
ds.close();
}
}
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![Example: Receiving datagramPacket by DatagramSocket
import java.net.*;
public class Dreceiver
{
public static void main(String[] args) throws Exception
{
DatagramSocket ds = new DatagramSocket(3000);
byte[] buf = new byte[1024];
DatagramPacket dp = new DatagramPacket(buf, 1024);
ds.receive(dp);
String str = new String(dp.getData(), 0, dp.getLength());
System.out.println(str);
ds.close();
}
}
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Java- Datagram Socket class & Datagram Packet class
- 1. Datagram Socket class & Datagram Packet class PREPARED BY Ruchi Maurya
- 2. Contents • Introduction • Datagram Socket class • Datagram Packet class • Example Ruchi Maurya
- 3. Introduction • Datagram is a bundle of information passed between machines • Java implements datagrams on top of the UDP protocol by using two classes: i. Datagram Packet class (Data container) ii. Datagram Socket class (Mechanism used) Ruchi Maurya
- 4. Datagram Socket class • The Datagram Socket class represents a connection-less socket for sending or receiving datagram packets • The Datagram Socket object is the data container used to send or receive the Datagram packets • No guarantee of its content , arrival or arrival time Ruchi Maurya
- 5. Datagram Socket class • It defines four public constructors: • DatagramSocket() throws SocketException: Creates a DatagramSocket bound to any unused port • DatagramSocket(int port) throws SocketException: Creates a DatagramSocket bound to Specified port • DatagramSocket(int port, InetAddress ipAddress) throws SocketException: Constructs a DatagramSocket bound to Specified port & InetAddress • DatagramSocket(SocketAddress address) throws SocketException: Creates a DatagramSocket bound to Specified SocketAddress Ruchi Maurya
- 6. Datagram Packet class • DatagramPacket is a message that can be sent or received • When multiple packets are sent, it may arrive in any order • Packet Delivery is not guaranteed Ruchi Maurya
- 7. Datagram Packet class • Commonly used constructors: • DatagramPacket(byte data[ ], int size): This constructor is used to receive the packets • DatagramPacket(byte data[ ], int size, InetAddress ipAddress, int port): This constructor is used to send the packets Ruchi Maurya
- 8. Example: Sending datagramPacket by DatagramSocket import java.net.*; public class Dsender { public static void main(String[] args) throws Exception { DatagramSocket ds = new DatagramSocket(); String str = "Welcome java"; InetAddress ip = InetAddress.getByName("127.0.0.1"); DatagramPacket dp = new DatagramPacket(str.getBytes(), str.length(), ip, 3000); ds.send(dp); ds.close(); } } Ruchi Maurya
- 9. Example: Receiving datagramPacket by DatagramSocket import java.net.*; public class Dreceiver { public static void main(String[] args) throws Exception { DatagramSocket ds = new DatagramSocket(3000); byte[] buf = new byte[1024]; DatagramPacket dp = new DatagramPacket(buf, 1024); ds.receive(dp); String str = new String(dp.getData(), 0, dp.getLength()); System.out.println(str); ds.close(); } } Ruchi Maurya
- 10. Thanks A Lot….!! Ruchi Maurya