Sign Up Module

Sign Up process is not advisable through web application because when we POST our form, we submit the values in clear. The only time we can manipulate the POST-ed data is when we process the data by the classes, which are located at the web server.

So, the Sign Up process can be done with Java application. That is, an application capable of contacting a web server. And this is a network-comma-socket programming.

http://www.onjava.com/pub/a/onjava/2003/04/23/java_webserver.html?page=1
http://www.davidreilly.com/java/java_network_programming/
Socket Multithreaded Server and Client
Socket Programming in Java - SMTP Example
Java Web Server and JSP
http://www.subrahmanyam.com/articles/servlets/ServletIssues.html