How to automlog into webside using username and password using java program

Question

I am trying to log in to a website using password and username. What libraries i can use. I searched online and came to know that i can use Apache's commons HttpClient library to do that. I am new to this please let me know what can i use.
For starting purpose i wrote this code:
public static void main(String[] args) throws URIException {
     try {
          HttpClient client = new HttpClient();
          GetMethod method = new GetMethod("http://www.google.com");
               int returnCode = client.executeMethod(method);
               System.err.println(method.getResponseBodyAsString());
          method.releaseConnection();
          } catch (HttpException e) {
               e.printStackTrace();
          } catch (IOException e) {
               e.printStackTrace();
but this is giving me an error. please see below,
java.net.UnknownHostException: www.google.com
     at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
     at java.net.PlainSocketImpl.connect(Unknown Source)
     at java.net.SocksSocketImpl.connect(Unknown Source)
     at java.net.Socket.connect(Unknown Source)
     at java.net.Socket.connect(Unknown Source)
     at java.net.Socket.<init>(Unknown Source)
     at java.net.Socket.<init>(Unknown Source)
     at org.apache.commons.httpclient.protocol.DefaultProtocolSocketFactory.createSocket(DefaultProtocolSocketFactory.java:80)
     at org.apache.commons.httpclient.protocol.DefaultProtocolSocketFactory.createSocket(DefaultProtocolSocketFactory.java:122)
     at org.apache.commons.httpclient.HttpConnection.open(HttpConnection.java:707)
     at org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:387)
     at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:171)
     at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:397)
     at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:323)
     at com.verizon.zoeott.ingest.PropertyFileReader.main(PropertyFileReader.java:48)
Another thing is that we use proxy to get internet connection. In internet explorer-->internet options-->LAN Settings-->using automatic configuration script to connect to the internet.
I don't know how to configure this into java program. please help.
Thanks,
amol
Edited by: 877846 on Jan 20, 2012 9:16 AM
Edited by: 877846 on Jan 20, 2012 9:21 AM

Answer 1

Also please let me know about how to connect internet through proxy server.As I said above, if you are using the Apache HTTP client, no we can't, as this is not an Apache forum. I also told you where to find that answer.
If on the other hand you don't want to use that client any more, setting the system properties http.proxyHost and http.proxyPort will do it for java.net.HttpURLConnection. See the Java Custom Networking tutorial for examples.