Reading Data from Properties Files in Java

Properties class to simplify this process.


Step-by-Step Guide

1. Create a Properties File

Create a file named config.properties (or any name you prefer):


properties

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# config.properties

username=admin

password=secret123

url=http://example.com

2. Read Properties File in Java

You can read the file using FileInputStream or InputStream (e.g., from the classpath).


Example 1: Using FileInputStream

java

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import java.io.FileInputStream;

import java.io.IOException;

import java.util.Properties;


public class PropertiesReader {

    public static void main(String[] args) {

        Properties props = new Properties();


        try (FileInputStream fis = new FileInputStream("config.properties")) {

            props.load(fis);

            String username = props.getProperty("username");

            String password = props.getProperty("password");

            String url = props.getProperty("url");


            System.out.println("Username: " + username);

            System.out.println("Password: " + password);

            System.out.println("URL: " + url);

        } catch (IOException e) {

            e.printStackTrace();

        }

    }

}

Example 2: Reading from Classpath (e.g., inside a resources/ directory)

java

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import java.io.InputStream;

import java.util.Properties;


public class ClasspathPropertiesReader {

    public static void main(String[] args) {

        Properties props = new Properties();


        try (InputStream input = ClasspathPropertiesReader.class

                .getClassLoader()

                .getResourceAsStream("config.properties")) {

            

            if (input == null) {

                System.out.println("Sorry, unable to find config.properties");

                return;

            }


            props.load(input);

            System.out.println("Username: " + props.getProperty("username"));

            System.out.println("Password: " + props.getProperty("password"));

            System.out.println("URL: " + props.getProperty("url"));

        } catch (Exception ex) {

            ex.printStackTrace();

        }

    }

}

Key Points

Use Properties.load(InputStream) to load the file.

Use getProperty(String key) to read values.

Always handle exceptions like IOException.

Place the .properties file in the classpath if using class loader.

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