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Proxy Vole is a Java library to auto detect the platform network proxy settings.
There is a newer version: 1.1.6
package com.github.markusbernhardt.proxy.util;

import com.github.markusbernhardt.proxy.util.Logger.LogLevel;

/*****************************************************************************
 * Defines some helper methods to find the correct platform.
 *
 * @author Markus Bernhardt, Copyright 2016
 * @author Bernd Rosstauscher, Copyright 2009
 ****************************************************************************/

public class PlatformUtil {

	public static final String OVERRIDE_HOME_DIR = "com.btr.proxy.user.home";

	public enum Platform {
		WIN, LINUX, MAC_OS, SOLARIS, OTHER
	}

	public enum Desktop {
		WIN, KDE, GNOME, MAC_OS, OTHER
	}

	public enum Browser {
		IE, FIREFOX
	}

	/*************************************************************************
	 * Gets the platform we are currently running on.
	 * 
	 * @return a platform code.
	 ************************************************************************/

	public static Platform getCurrentPlattform() {
		String osName = System.getProperty("os.name");
		Logger.log(PlatformUtil.class, LogLevel.TRACE, "Detecting platform. Name is: {}", osName);

		if (osName.toLowerCase().contains("windows")) {
			Logger.log(PlatformUtil.class, LogLevel.TRACE, "Detected Windows platform: {}", osName);
			return Platform.WIN;
		}
		if (osName.toLowerCase().contains("linux")) {
			Logger.log(PlatformUtil.class, LogLevel.TRACE, "Detected Linux platform: {}", osName);
			return Platform.LINUX;
		}
		if (osName.startsWith("Mac OS")) {
			Logger.log(PlatformUtil.class, LogLevel.TRACE, "Detected Mac OS platform: {}", osName);
			return Platform.MAC_OS;
		}
		if (osName.startsWith("SunOS")) {
			Logger.log(PlatformUtil.class, LogLevel.TRACE, "Detected Solaris platform: {}", osName);
			return Platform.SOLARIS;
		}

		return Platform.OTHER;
	}

	/*************************************************************************
	 * Gets the ID for the platform default browser.
	 * 
	 * @return a browser ID, null if no supported browser was detected.
	 ************************************************************************/

	public static Browser getDefaultBrowser() {
		// Use better logic to detect default browser?
		if (getCurrentPlattform() == Platform.WIN) {
			Logger.log(PlatformUtil.class, LogLevel.TRACE, "Detected Browser is InternetExplorer");
			return Browser.IE;
		} else {
			Logger.log(PlatformUtil.class, LogLevel.TRACE, "Detected Browser Firefox. Fallback?");
			return Browser.FIREFOX;
		}
	}

	/*************************************************************************
	 * Gets the desktop that we are running on.
	 * 
	 * @return the desktop identifier.
	 ************************************************************************/

	public static Desktop getCurrentDesktop() {
		Platform platf = getCurrentPlattform();

		if (platf == Platform.WIN) {
			Logger.log(PlatformUtil.class, LogLevel.TRACE, "Detected Windows desktop");
			return Desktop.WIN;
		}
		if (platf == Platform.MAC_OS) {
			Logger.log(PlatformUtil.class, LogLevel.TRACE, "Detected Mac OS desktop");
			return Desktop.MAC_OS;
		}

		if (platf == Platform.LINUX || platf == Platform.SOLARIS || platf == Platform.OTHER) {

			if (isKDE()) {
				Logger.log(PlatformUtil.class, LogLevel.TRACE, "Detected KDE desktop");
				return Desktop.KDE;
			}
			if (isGnome()) {
				Logger.log(PlatformUtil.class, LogLevel.TRACE, "Detected Gnome desktop");
				return Desktop.GNOME;
			}
		}
		Logger.log(PlatformUtil.class, LogLevel.TRACE, "Detected Unknown desktop");
		return Desktop.OTHER;
	}

	/*************************************************************************
	 * Checks if we are currently running under Gnome desktop.
	 * 
	 * @return true if it is a Gnome else false.
	 ************************************************************************/

	private static boolean isGnome() {
		return System.getenv("GNOME_DESKTOP_SESSION_ID") != null;
	}

	/*************************************************************************
	 * Checks if we are currently running under KDE desktop.
	 * 
	 * @return true if it is a KDE else false.
	 ************************************************************************/

	private static boolean isKDE() {
		return System.getenv("KDE_SESSION_VERSION") != null;
	}

	/*************************************************************************
	 * Gets the user home directory where normally all the settings are stored.
	 * 
	 * @return the path to the home directory.
	 ************************************************************************/

	public static String getUserHomeDir() {
		String result = System.getProperty("user.home");
		String override = System.getProperty(OVERRIDE_HOME_DIR);
		if (override != null && override.trim().length() > 0) {
			result = override;
		}
		return result;
	}

}