Read and Display the Properties from a Properties File

In this post, we are going to see how to read a properties from a Properties file.

Project Structure:
=======================================================
ReadingProperties
  Src
       com.ranga
          ReadProperties.java
          login.properties
=======================================================

ReadProperties.java

package com.ranga;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

/**
 * @author Ranga Reddy
 * @version 1.0
 */
public class ReadProperties {
    public static void main(String[] args) {        
        InputStream inputStream = null;
        Properties properties = new Properties();
        try {
            inputStream = new FileInputStream("login.properties");
            properties.load(inputStream);
            String username = properties.getProperty("username");
            String password = properties.getProperty("password");
            System.out.println("=========================================");
            System.out.println("username: " + username + " : password: " + password);
            System.out.println("=========================================");
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if(inputStream != null) {
                try {
                    inputStream.close();
                } catch (IOException e) {                   
                    e.printStackTrace();
                }
            }
        }
    }
}

login.properties
=====================
username=ranga
password=reddy

Output:

=========================================
username: ranga : password: reddy
=========================================

Reading both Key and Values:

            // Reading the both key and values
            Enumeration props = properties.propertyNames();
            while (props.hasMoreElements()) {
                String key = (String) props.nextElement();
                String value = properties.getProperty(key);
                System.out.println("Key: " + key + ", Value: " + value);
            }