It is possible to detect the proxy using the ProxySelector class and assign the system proxy by assigning environment variables with the setProperty method of the System class:
System.setProperty("java.net.useSystemProxies", "true");
System.out.println("detecting proxies");
List l = null;
try {
l = ProxySelector.getDefault().select(new URI("http://foo/bar"));
}
catch (URISyntaxException e) {
e.printStackTrace();
}
if (l != null) {
for (Iterator iter = l.iterator(); iter.hasNext();) {
java.net.Proxy proxy = (java.net.Proxy) iter.next();
System.out.println("proxy type: " + proxy.type());
InetSocketAddress addr = (InetSocketAddress) proxy.address();
if (addr == null) {
System.out.println("No Proxy");
} else {
System.out.println("proxy hostname: " + addr.getHostName());
System.setProperty("http.proxyHost", addr.getHostName());
System.out.println("proxy port: " + addr.getPort());
System.setProperty("http.proxyPort", Integer.toString(addr.getPort()));
}
}
}