How to get a connection via a proxy?

Question

Hello all,
I'm writng an application that sends a request to the google search engine and then downloads the contents of the web page returned. Connecting from home via a dial up causes no problems but when i try the same code from college (which uses a proxy) i get an IOException. I think this is what is causing the problem. Another developer posted a message with a similar problem to myself and i used the code he was given as a possible solution but it hasn't solved the problem. I posted the code i'm using below. any suggestions would be welcome because i'm clueless as to what to do next.
import java.net.*;
import java.io.*;
import java.util.*;
public class GoogleConnector {
String hostname = "www.google.com";
int port = 80;
String s1, s2 = new String();
Set hs = new HashSet();
Properties systemProperties = System.getProperties();
// here is the method to get the URLs
public Set getList(String arg1) {
try {
systemProperties.put("proxySet","true");
systemProperties.put("proxyHost","192.168.5.251");
systemProperties.put("proxyPort","3129");
systemProperties.put("socksProxyPort","3129");
systemProperties.put("socksProxyHost","192.168.5.251");
System.setProperties(systemProperties);
Socket s = new Socket(hostname,port);
InputStream sin = s.getInputStream();
BufferedReader fromServer = new BufferedReader(new InputStreamReader(sin));
OutputStream sout = s.getOutputStream();
PrintWriter toServer = new PrintWriter(new OutputStreamWriter(sout));
Send request as specified in arg1 to the server
and write whole page as a string broken up by newline character
toServer.print("GET " + arg1 + " HTTP/1.1\n");
toServer.print("Host: " + hostname + "\n\n");
toServer.flush();
for (s1 = null; (s1 = fromServer.readLine()) != null; ) {
s2 += s1 + "\n";
// close all connections
toServer.close();
fromServer.close();
s.close();
I do some other processing here but it's not relevant to the connection problem.
catch (UnknownHostException ue) {
System.out.println("UnknownHostException");
catch (IOException ie) {
System.out.println("GoogleConnector: IOException");
return hs; //can ignore this return statement
} // end getList
} // end GoogleConnector

Answer 1

Here's a working code sample to connect using a proxy server:
http://www.esus.com/docs/GetQuestionPage.jsp?uid=666
and don't forget, you can use the google web api's:
http://www.esus.com/docs/GetQuestionPage.jsp?uid=1570
Cheers