Read and write to properties file in Java

This short article shows you how to read and write value to properties file in Java.

 

1. Import java.util.Properties

 

import java.util.Properties;

 

2. The code snippet to write to properties file as below.

try (OutputStream out = new FileOutputStream(“example.properties”)) {

                     Properties properties = new Properties();

                     properties.setProperty(“name”, “mingman”);

3. The snippet to read to properties file as below.

try (InputStream in = new FileInputStream(“example.properties”)) {

                     Properties prop = new Properties();

                     prop.load(in);

                     System.out.println(“####Properties.getProperty usage####”);

                     System.out.println(prop.getProperty(“name”));

                     System.out.println();

 

                     System.out.println(“####Properties.stringPropertyNames usage####”);

                     for (String property : prop.stringPropertyNames()) {

                           String value = prop.getProperty(property);

                           System.out.println(property + “=” + value);

                     }

This code is extracted from http://examples.javacodegeeks.com/core-java/util/properties/properties-file-java-example/.

You can also download a single solution from http://skydrive.live.com. The sample file name is JavaPropertiesExample.zip. My MSN ID is chanmmn@hotmail.com.