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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
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