How to write a socket in that i have to use an array of ports

Question

dear all
Iam doing project in java in that iam using sockets. My problem is i want to keep array of ports in my programming. suppose one port is busy then it automatically take the other port in the array of ports. Please can any body give me the solution how to use that one. Or if any body know any site regrding that please send me. Ill be waiting for your rely.
regards
sonali

Answer 1

Hi Sonali,
You can use this. To test,
javac Sockets.java
java Sockets &
java Sockets &
Here I have used only 3 entries in the array. Server sockets bind and and then listen on them. This is for server sockets. You can write the client side part which will be similar to this.
Hope it helps.
Regards,
Giridhar
import java.net.*;
public class Sockets
ServerSocket socket = null;
int ports[];
int counter;
public Sockets()
counter = 0;
ports = new int[3];
ports[0] = 1000;
ports[1] = 1900;
ports[2] = 12000;
public ServerSocket bindSocket()
int backLog = 50;
try
socket = new ServerSocket(ports[counter], backLog, InetAddress.getByName("localhost"));
System.out.println("server socket bound successfully at port " + ports[counter]);
return socket;
catch(BindException e)
System.err.println("Port " + ports[counter] + "is busy, trying with " +
ports[++counter]);
if (counter == ports.length)
System.out.println("Could not succeed with any port, returning null");
return null;
return bindSocket();
catch(UnknownHostException uhe)
System.err.println("wrong host name");
return null;
catch(java.io.IOException ioe)
ioe.printStackTrace();
return null;
public static void main(String[] args)
Sockets sockets = new Sockets();
ServerSocket ss = sockets.bindSocket();
try
while(true)
Socket acc = ss.accept();
System.out.println("client accepted, break");
break;
System.out.println("tested, now closing the socket");
ss.close();
catch(java.io.IOException e)
System.err.println("io exception while closing socket");