Ping Specific port in JAVA

This class is for testing the connectivity to a database. Very useful to avoid data missing during db server is down. Data can be save in file or store in another db server temporarily.

package com.blogspot.lxnx;

import java.io.*;
import java.net.*;


public class Pinger {
  public static void main(String args[]) {
    try {
      InetAddress addr = InetAddress.getByName("localhost"); 
      int port = 3306; 
      SocketAddress sockaddr = new InetSocketAddress(addr, port); 
      
      // Create an unbound socket 
      Socket sock = new Socket(); 
      // This method will block no more than timeoutMs. 
      // If the timeout occurs, SocketTimeoutException is thrown. 
      int timeoutMs = 2000; // 2 seconds 
      sock.connect(sockaddr, timeoutMs); 
      System.out.println("Alive!");
    } catch (UnknownHostException e) {
      System.err.println("Unable to lookup");
    } catch (SocketTimeoutException e) {
      System.err.println("Connection timeout");
    } catch (IOException e) { 
      System.err.println("Unable to reach");
    } 
  
   }
}

credit to http://www.exampledepot.com/egs/java.net/CreateClientSocket.html