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Proxy Vole is a Java library to auto detect the platform network proxy settings.
There is a newer version: 1.0.5
package com.github.markusbernhardt.proxy.util;

import java.net.MalformedURLException;
import java.net.Proxy;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import com.github.markusbernhardt.proxy.selector.fixed.FixedProxySelector;
import com.github.markusbernhardt.proxy.selector.pac.PacProxySelector;
import com.github.markusbernhardt.proxy.selector.pac.PacScriptSource;
import com.github.markusbernhardt.proxy.selector.pac.UrlPacScriptSource;

/*****************************************************************************
 * Small helper class for some common utility methods.
 *
 * @author Markus Bernhardt, Copyright 2016
 * @author Bernd Rosstauscher, Copyright 2009
 ****************************************************************************/

public class ProxyUtil {

	public static final int DEFAULT_PROXY_PORT = 80;

	private static List noProxyList;

	/*************************************************************************
	 * Parse host and port out of a proxy variable.
	 * 
	 * @param proxyVar
	 *            the proxy string. example: http://192.168.10.9:8080/
	 * @return a FixedProxySelector using this settings, null on parse error.
	 ************************************************************************/

	public static FixedProxySelector parseProxySettings(String proxyVar) {
		if (proxyVar == null || proxyVar.trim().length() == 0) {
			return null;
		}

		try {
			// Protocol missing then assume http and provide it
			if (proxyVar.indexOf(":/") == -1) {
				proxyVar = "http://" + proxyVar;
			}

			URL url = new URL(proxyVar);
			String host = cleanIPv6(url.getHost());

			int port = url.getPort();
			if (port == -1) {
				port = DEFAULT_PROXY_PORT;
			}
			return new FixedProxySelector(host.trim(), port);
		} catch (MalformedURLException e) {
			Logger.log(ProxyUtil.class, Logger.LogLevel.WARNING, "Cannot parse Proxy Settings {0}", proxyVar);
			return null;
		}
	}

	/*************************************************************************
	 * Gets an unmodifiable proxy list that will have as it's only entry an
	 * DIRECT proxy.
	 * 
	 * @return a list with a DIRECT proxy in it.
	 ************************************************************************/

	public static synchronized List noProxyList() {
		if (noProxyList == null) {
			ArrayList list = new ArrayList(1);
			list.add(Proxy.NO_PROXY);
			noProxyList = Collections.unmodifiableList(list);
		}
		return noProxyList;
	}

	/*************************************************************************
	 * Build a PAC proxy selector for the given URL.
	 * 
	 * @param url
	 *            to fetch the PAC script from.
	 * @return a PacProxySelector or null if it is not possible to build a
	 *         working selector.
	 ************************************************************************/

	public static PacProxySelector buildPacSelectorForUrl(String url) {
		PacProxySelector result = null;
		PacScriptSource pacSource = new UrlPacScriptSource(url);
		if (pacSource.isScriptValid()) {
			result = new PacProxySelector(pacSource);
		}
		return result;
	}

	/*************************************************************************
	 * This method can be used to cleanup an IPv6 address. It will remove the
	 * surrounding square brackets if found. e.g. [2001:4860:0:2001::68] will be
	 * returned as 2001:4860:0:2001::68
	 * 
	 * @param hostOrIP
	 *            to cleanup
	 * @return the raw host or IP without any IPv6 brackets.
	 ************************************************************************/

	public static String cleanIPv6(String hostOrIP) {
		if (hostOrIP == null) {
			return null;
		}
		hostOrIP = hostOrIP.trim();
		if (hostOrIP.startsWith("[")) {
			hostOrIP = hostOrIP.substring(1);
		}
		if (hostOrIP.endsWith("]")) {
			hostOrIP = hostOrIP.substring(0, hostOrIP.length() - 1);
		}
		return hostOrIP;
	}

}