Loading Java Properties File Dynamically

How to Load Java Properties File Dynamically From the Classpath?

What is the purpose of properties file? if we are using any application or project where there is a chance of constantly changing any credentials, for example  any java email application or any there you may need to change from address, to address or any properties right ? For this opening .java file and doing the modifications and again re-compile and re-deploy if you need to change 100′s of .java files its very tedius job right so this .properties file.

We will place this .properties file in general at classpath location, will see how to load that properties file into .java programs and how to use it. In this application my properties file name  = orderworkbench.properties

Clientprograme.java

package chandra;

import java.io.IOException;

import java.io.InputStream;

import java.net.URL;

import java.util.Properties;

public class Clientprograme {

               public static void main(String args[])

               {

// First Way

                               Properties prop = new Properties();

                               InputStream inputStream = Thread.currentThread().getContextClassLoader().getResourceAsStream("orderworkbench.properties");

                               try{

                               prop.load(inputStream);

                               }catch(IOException e)

                               {

                                              e.printStackTrace();

                               }

                               System.out.println("------- By Using Thread class -------");

                               //Print required values

                               System.out.println(prop.get("user"));

                               //Print all the properties

                               System.out.println(prop);

// Second Way

                               URL url = ClassLoader.getSystemResource("orderworkbench.properties");

                               try{

                               prop.load(url.openStream());

                               }catch(Exception e)

                               {

                                              e.printStackTrace();

                               }

                               System.out.println("------- By Using URL class -------");

                   System.out.println(prop);

               }

}