How to create a web proxy?

Question

I want to create web proxy . I googled it and even found some tutorial but those were in PHP.
If somebody is having tutorial of web proxy creation in java then please post it here Or simply let me know what approach should i follow to create web proxy. [ i will be using Tomcat { if that matters for your answer } ]

Thanks

Edit
i guess i was not clear in stating what i require. Actually i am trying to develop a site like 'http://proxyug.com/' .

Answer 1

What traffic are you going to proxy? Presumably the answer to the previous question will obliterate the need for this one, but if you are proxying HTTP, is there any reason you can't use an off-the-shelf solution?

Answer 2

This is simply the method you'd use to create a proxy server. Not sure exactly why you refer to doing it 'in java' but based on the information below you'll just need to configure the appropriate settings for mod_proxy and would probably be better off asking this question on ServerFault:

From The Apache Tomcat 5.5 Servlet/JSP Container Proxy Support HOW-TO

Apache 1.3 supports an optional module (mod_proxy) that configures the web server to act as a proxy server. This can be used to forward requests for a particular web application to a Tomcat 5 instance, without having to configure a web connector such as mod_jk.

http://tomcat.apache.org/tomcat-5.5-doc/proxy-howto.html

Answer 3

JSocks is a SOCKS proxy server written in Java.

http://jsocks.sourceforge.net/