Need to create a program to test for open TCP ports

I have a need for a port testing tool that I can program to to read and send from one node to another in a network. I know there may be tools that could do this for me, but I want flexibility of changing the functionality as the need arises. My preferred language is Java because I would like to run on both windows and Linux.

Here is what I would like the tool to do:

listen on a specified range of ports for a known message and when we receive that message, close that port.

Similarly, I want the program to write a message to a specified set of ports.

After all ports are verified or after a specified timeout, the program should spit out a report (I can handle this part).

As a follow up question once I have the program working, I want to set it up to use secure protocol as an option.
Christopher ScheneSystem Engineer/Software EngineerAsked:
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CEHJCommented:
This is a good framework to get you started. I also have an https version


http://technojeeves.com/joomla/index.php/free/84-server-by-david-flanagan
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Christopher ScheneSystem Engineer/Software EngineerAuthor Commented:
Looks pretty good I'll try this. I'll ask for the http version in a separate question so you get another 500 points
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CEHJCommented:
No - don't worry about the points thanks
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Christopher ScheneSystem Engineer/Software EngineerAuthor Commented:
What is the purpose of these lines in the example code?  I have taken a java class, but most of my programming is in C, C#, Vb.net---I am not familiar with the Hash templates

threadGroup = new ThreadGroup(Server.class.getName());
      this.maxConnections = maxConnections;
      services = new HashMap<Integer, Listener>();
      connections = new HashSet<Connection>(maxConnections);

It looks like a good book...I think I'll buy it.
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Christopher ScheneSystem Engineer/Software EngineerAuthor Commented:
I purchased the book as well. Thanks!
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CEHJCommented:
What is the purpose of these lines in the example code?

There's quite a bit there - which part of that do you mean?

I purchased the book as well. Thanks!

That's a good investment!
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