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How to read/write data from/to .properties file in Java?
The .properties is an extension in java which is used to store configurable application. It is represented by the Properties class in Java, you can store a properties file and read from it using the methods of this class. This class inherits the HashTable class.
Creating a .properties file −
To create a properties file −
Instantiate the Properties class.
Populate the created Properties object using the put() method.
Instantiate the FileOutputStream class by passing the path to store the file, as a parameter.
Example
The Following Java program creates a properties file in the path D:/ExampleDirectory/
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Properties;
public class CreatingPropertiesFile {
public static void main(String args[]) throws IOException {
//Instantiating the properties file
Properties props = new Properties();
//Populating the properties file
props.put("Device_name", "OnePlus7");
props.put("Android_version", "9");
props.put("Model", "GM1901");
props.put("CPU", "Snapdragon855");
//Instantiating the FileInputStream for output file
String path = "D:\ExampleDirectory\myFile.properties";
FileOutputStream outputStrem = new FileOutputStream(path);
//Storing the properties file
props.store(outputStrem, "This is a sample properties file");
System.out.println("Properties file created......");
}
}Output
Properties file created......
If you observe the output file you can see the created contents as −
Storing properties file in XML format
You can store the properties file in XML format using the stored XML() method.
Example
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Properties;
public class CreatingPropertiesFile {
public static void main(String args[]) throws IOException {
//Instantiating the properties file
Properties props = new Properties();
//Populating the properties file
props.put("Device_name", "OnePlus7");
props.put("Android_version", "9");
props.put("Model", "GM1901");
props.put("CPU", "Snapdragon855");
//Instantiating the FileInputStream for output file
String outputPath = "D:\ExampleDirectory\myFile.xml";
FileOutputStream outputStrem = new FileOutputStream(outputPath);
//Storing the properties file in XML format
props.storeToXML(outputStrem, "This is a sample properties file");
System.out.println("Properties file created......");
}
}Output
Properties file created......
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