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Tip of the Day
Language: Java
Expertise: Intermediate
Dec 16, 2003

Sending Data to a Port in UDP Format

The ByteBuffer Class (from the java.nio package) helps you to write data in UDP by converting them to the respective bytes they generally occupy. This is especially helpful when trying to control network traffic.

The example code, by default, has the same computer as the destination and a port 10001 as the listening port. A different process can listen on this port and receive the UDP message sent by this application.


The Code:
import java.net.*;
import java.io.*;
import java.nio.*;

public class SendUDPData{

private String serverIP = "127.0.0.1";
private int listeningPort = 10001;
private DatagramSocket datagramSocket = null;

public static void main(String args[]){
SendUDPData sendUDPData = new SendUDPData();
sendUDPData.sendData();
}

private void sendData(){
try{

// Initializing a byte Array
byte[] byteDataArr = new byte[10];

ByteBuffer configDataBuffer = ByteBuffer.wrap(byteDataArr);

// Initializing the variables
int configRackID = 12;
int configPortID = 760;

//populating the configDataBuffer with the required values.
//Will populate the first 4 bytes
configDataBuffer.putInt(configRackID);
//Will populate the second 4 bytes
configDataBuffer.putInt(configPortID);
// and so on...

//Two ways of creating a datagramSocket. Can use the one required
//Will create a DatagramSocket on port 10000
datagramSocket = new DatagramSocket(10000);
//Will create a DatagramSocket on any available port
datagramSocket = new DatagramSocket();
//Will connect to the IPAddress provided by the serverIP and to the
port specified by listeningPort

datagramSocket.connect(InetAddress.getByName(serverIP),listeningPort);

datagramSocket.send(new DatagramPacket(byteDataArr,
byteDataArr.length));

datagramSocket.close();
System.out.println("Data sent successfully.");

}catch(SocketException se){
//handle SocketException
System.out.println("SocketException: "+se);
}catch(UnknownHostException uhe){
//handle UnknownHostException
System.out.println("UnknownHostException: "+uhe);
}catch(IOException ioe){
//handle IOException
System.out.println("IOException: "+ioe);
}catch(Exception e){
//handle Exception
System.out.println("Exception: "+e);
}finally{
if (datagramSocket != null)
datagramSocket.close();
}

}
}
Sridhar MS
 
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