I need some ideas

I do not know if this is the right place to ask for but i need some ideas and help.I need to work on a project to develop a Web Service, that receives data from 2 remote machines at different places , compare them and then return the result to first one.I am not a good java programmer so could anybody tell me please which part of the Java i must learn and what areother topics i must know.
thanks

Well I would say:
Java Server Pages + Struts
and maybe even
J2EEJSP/Struts are probably unnecessary for this project. Other J2EE (a superset of JSP/Struts) may be overkill as well, depending your needs. I'd recommend starting here:
The Java™ Tutorial - Lesson: All About Sockets
Sockets programming in Java: A tutorial
If, however, you're "not a good Java programmer", network programming may be a bit challenging, and you may want to start at a lower level of difficulty before diving in. To that end, I recommend the following resources:
The Java Tutorial - A practical guide for programmers
Essentials, Part 1, Lesson 1: Compiling & Running a Simple Program
New to Java Center
How To Think Like A Computer Scientist
Introduction to Computer Science using Java
The Java Developers Almanac 1.4
JavaRanch: a friendly place for Java greenhorns
jGuru
Bruce Eckel's Thinking in Java
Joshua Bloch's Effective Java
Bert Bates and Kathy Sierra's Head First Java

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