java program to find proxy settings of a System


Levels of difficulty: / perform operation:

java program

import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Properties;
import java.net.InetSocketAddress;
import java.net.Proxy;
import java.net.ProxySelector;
import java.net.URI;
public class Main {
	public static void main(String s[]) 
	   throws Exception {
		try {
			Properties systemSettings = System.getProperties();
			systemSettings.put("proxySet", "true");
			systemSettings.put("http.proxyHost", 
			         "proxy.mycompany1.local");
			systemSettings.put("http.proxyPort", "80");
			URL u = new URL("http://www.google.com");
			HttpURLConnection con = (HttpURLConnection)
			         u.openConnection();
			System.out.println(con.getResponseCode() +  " : " +con.getResponseMessage());
			System.out.println(con.getResponseCode() == HttpURLConnection.HTTP_OK);
		}
		catch (Exception e) {
			e.printStackTrace();
			System.out.println(false);
		}
		System.setProperty("java.net.useSystemProxies", 
		      "true");
		Proxy proxy = (Proxy) ProxySelector.getDefault().
		      select(new URI("http://www.yahoo.com/")).iterator().next();
		System.out.println("proxy hostname : " + proxy.type());
		InetSocketAddress addr = (InetSocketAddress)
		      proxy.address();
		if (addr == null) {
			System.out.println("No Proxy");
		} else {
			System.out.println("proxy hostname : " + addr.getHostName());
			System.out.println("proxy port : "+ addr.getPort());
		}
	}
}


Output

200 : OK
true
proxy hostname : HTTP
proxy hostname : proxy.mycompany1.local
proxy port : 80





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