Can't connect throut proxy to the Web.

Question

I can't connect through proxy to the Web by use URLConnection or HttpURLConnection.
I used:
Properties prop = System.getProperties();
prop.put("http.proxyHost","your-proxy-host");
prop.put("http.proxyPort","proxy-port");
get err:
Error Code: 407 (Proxy Authentication Required).
Error: Access is Denied.
1. How can I setup my app to work through a proxy server?
I think that is must the proxy server get username and password, because browser demand login too, when connect URL via proxy.
2. How can I send username and password to the proxy server?
PS: with browser (IE) I connect to the Web perfectly.
Thanks,
Hill

Answer 1

See if this works:
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.text.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;
import java.util.*;
public class randomYahooLink
{     private      URL randomYahooLinkURL;
     private      String pageSource;
     private     JEditorPane pageHolder = new JEditorPane();
     public randomYahooLink()
     {     System.out.println("Entering default constructor.");
          try
          {     randomYahooLinkURL = new URL "http://random.yahoo.com/bin/ryl");
          }     catch(MalformedURLException MUE)
          {     System.out.println("ERROR: Malformed URL!");
          System.out.println("-fin- default constructor");
     public randomYahooLink(String proxyHost, String proxyPort)
     {     System.out.println("Entering proxy constructor.");
          System.getProperties().put("proxyHost", proxyHost);
          System.getProperties().put("proxyPort", proxyPort);
          try
          {     randomYahooLinkURL = new URL("http://random.yahoo.com/bin/ryl");
          }     catch(MalformedURLException MUE)
          {     System.out.println("ERROR: Malformed URL!");
          System.out.println("-fin- proxy constructor");
          public void getPage()
     {     System.out.println("Entering getPage() function");
          try
          {     pageHolder.setPage(randomYahooLinkURL);
          } catch (IOException IO)
          {     System.out.println("ERROR: Could not retrieve link.");
          } catch (Exception e)
          {     System.out.println("ERROR: Some unknown error thing.");
          System.out.println("-fin- getPage()");
     public void displayResults()
     {     System.out.println("Entering displayResults() function.");
          try
          {     pageSource = pageHolder.getText();
               System.out.println("RETRIEVED " + pageSource.length() + " bytes of data");
          } catch (Exception e)
          {     System.out.println("ERROR: Could not display results.");
          System.out.println("-fin- displayResults()");
     public static void main(String args[])
     {     boolean done = false;
          long thisTime;
          randomYahooLink thisLink = new randomYahooLink("proxy","port");
          System.out.println("Program initialized.");
          while (!done)
          {     try
               {     thisLink.getPage();
                    thisTime = System.currentTimeMillis();
                    while (System.currentTimeMillis() < thisTime + 5000)
                    {     // do something
                    thisLink.displayResults();
               } catch (Exception e)
               {     System.out.println("ERROR in main program loop.");
          System.out.println("Completed program.");
}email me at [email protected] if you have trouble.