Properties and ResourceBundle from Xml file

labels_fr.xml

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE properties SYSTEM "http://java.sun.com/dtd/properties.dtd">
<properties>
<comment>labels francais</comment>
<entry key="maCle1">la valeur de la cle 1</entry>
<entry key="maCle2">la valeur de la cle 2</entry>
<entry key="maCle3">la valeur de la cle 3</entry>
</properties>

TestClass.java

package test;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
import java.util.ResourceBundle;

public class TestClass {

	public static void main(String[] args) throws FileNotFoundException, IOException {
		
		// Properties avec ressource xml
		try( InputStream inputstream = PropertiesXml.class.getClass().getResourceAsStream("/labels_fr.xml"); ) {
			Properties props = new Properties();
			props.loadFromXML(inputstream);
			System.out.println("maCle1: " + props.getProperty("maCle1"));
		}
		
		
		// ResourceBundle avec ressource xml
		ResourceBundle bundle = ResourceBundle.getBundle("labels", new XMLResourceBundleControl());
	    System.out.println("maCle1: " + bundle.getString("maCle1"));
	    
	}

}

XMLResourceBundle.java

package test;

import java.io.IOException;
import java.io.InputStream;
import java.util.Collections;
import java.util.Enumeration;
import java.util.Properties;
import java.util.ResourceBundle;
import java.util.Set;

/**
 * XML Resource Bundle
 * @author slabbe
 */
public class XMLResourceBundle extends ResourceBundle {
	
	private Properties props;

	public XMLResourceBundle(InputStream stream) throws IOException {
		props = new Properties();
		props.loadFromXML(stream);
	}

	@Override
	protected Object handleGetObject(String key) {
		return props.getProperty(key);
	}

	@Override
	public Enumeration<String> getKeys() {
		Set<String> handleKeys = props.stringPropertyNames();
		return Collections.enumeration(handleKeys);
	}
	
}

XMLResourceBundleControl.java

package test;

import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import java.util.Collections;
import java.util.List;
import java.util.Locale;
import java.util.ResourceBundle;

/**
 * Xml resource bundle control
 * @author slabbe
 */
public class XMLResourceBundleControl extends ResourceBundle.Control {
	
	private static final String XML = "xml";
	private static final List<String> SINGLETON_LIST = Collections.singletonList(XML);

	@Override
	public ResourceBundle newBundle(String baseName, Locale locale, String format, ClassLoader loader, boolean reload)
			throws IllegalAccessException, InstantiationException, IOException {

		if ((baseName == null) || (locale == null) || (format == null) || (loader == null)) {
			throw new IllegalArgumentException("baseName, locale, format and loader cannot be null");
		}
		if (!format.equals(XML)) {
			throw new IllegalArgumentException("format must be xml");
		}

		final String bundleName = toBundleName(baseName, locale);
		final String resourceName = toResourceName(bundleName, format);
		final URL url = loader.getResource(resourceName);
		if (url == null) {
			return null;
		}
		
		final URLConnection urlconnection = url.openConnection();
		if (urlconnection == null) {
			return null;
		}
		
		if (reload) {
			urlconnection.setUseCaches(false);
		}
		
		try ( 	final InputStream stream = urlconnection.getInputStream();
				final BufferedInputStream bis = new BufferedInputStream(stream);
				) {
			final ResourceBundle bundle = new XMLResourceBundle(bis);
			return bundle;
		}
	}

	@Override
	public List<String> getFormats(String baseName) {
		return SINGLETON_LIST;
	}

}