How to read the data from a properties file in Java?

The Properties is a subclass of Hashtable class and it represents a persistent set of properties. The Properties can be saved to a stream or loaded from a stream. Each key and its corresponding value in the property list is a string. 

The Properties file can be used in Java to externalize the configuration and to store the key-value pairs. The Properties.load() method of Properties class is convenient to load .properties file in the form of key-value pairs.

Syntax

public class Properties extends Hashtable

credentials.properties file

Example

import java.io.*;
import java.util.*;
public class ReadPropertiesFileTest {
   public static void main(String args[]) throws IOException {
      Properties prop = readPropertiesFile("credentials.properties");
      System.out.println("username: "+ prop.getProperty("username"));
      System.out.println("password: "+ prop.getProperty("password"));
   }
   public static Properties readPropertiesFile(String fileName) throws IOException {
      FileInputStream fis = null;
      Properties prop = null;
      try {
         fis = new FileInputStream(fileName);
         prop = new Properties();
         prop.load(fis);
      } catch(FileNotFoundException fnfe) {
         fnfe.printStackTrace();
      } catch(IOException ioe) {
         ioe.printStackTrace();
      } finally {
         fis.close();
      }
      return prop;
   }
}

Output

username: admin
password: admin@123