To validate telnet connectivity in java code

How to check whether telnet connectivity is available in my java code

It doesn't make sense to speak of "Telnet connectivity in Java code". You might ask whether there is Telnet connectivity to some other machine - that depends on whether the other machine is set up to be a Telnet host, and whether there's a network connection to that machine that allows Telnet traffic to go through. You can test this using a Telnet client such as Apache Commons Net.

As in there is a web site run by us.There are several protocols used http,https,ftp,ftps,ssh.My requirement is it i should check for generic protocol connectivity using telnet in local pc
for example:
if(ftp.isConnected()){
SFTLogger.writeToTraceLog(className,SFTConstants.INFO,
methodName,
userId+SFTConstants.HYPHEN_SEPERATOR+userName,
transmitterID + SFTConstants.HYPHEN_SEPERATOR + transmitterName,
fileTrackingID,
"Disconnecting from FTP Server ",null);

So you'd attempt a Telnet connection and handle any exceptions accordingly.

Note that Telnet should no longer be used over connections that go through untrusted networks (in other words, the public internet, unless it's over a VPN). That's what SSH is for.

. . . and welcome to the Ranch

Solved

import java.io.*;
import java.net.*;
import java.util.*;
import java.util.TimerTask;
import org.apache.commons.net.telnet.TelnetClient;
class Connectivity extends TimerTask
{
	public static void main(String args[])
	{
		try
		{
			System.out.println("Please enter ip address");
			Scanner sc=new Scanner(System.in);
			String ip=sc.nextLine().trim();
			System.out.println("Please enter port number");
			TimerTask con  = new Connectivity();
			Scanner sc1=new Scanner(System.in);
			int port=sc1.nextInt();
			Timer timer = new Timer();
		    timer.scheduleAtFixedRate(con,1,1000);
			Socket s1=new Socket(ip,port);
			InputStream is=s1.getInputStream();
			DataInputStream dis=new DataInputStream(is);
			if(dis!=null)
			{
				System.out.println("Connected with ip "+ip+" and port "+port);
			}
			else
			{
				System.out.println("Connection invalid");
			}
			
			dis.close();
			s1.close();
			
		}
		catch(Exception e)
		{
			System.out.println("Not Connected,Please enter proper input");
			
		}
		
	}

@Override
	public void run() {
		// TODO Auto-generated method stub
		
	}
}

Please always use the code button. Since you are new, I shall edit your post and you can see how much better it looks