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
Published on 09-Aug-2019 19:23:28
