Re: Running java on the server side?

=?ISO-8859-1?Q?Arne_Vajh=F8j?= <>
Tue, 13 May 2014 21:05:48 -0400
On 5/12/2014 4:35 AM, lipska the kat wrote:

On 10/05/14 19:48, wrote:

I am looking into eliminating Java applets from a hobby website of mine.

The web currently has 2 applets that accept some configuration data
and then do some calculations and display the results.

I am wondering if I can create Html accepts the configuration data,
sends it to the server where a java application can run to crunch the
results and create an html page. Then, the html page can be displayed.

That way I can use the existing number crunching code in Java and have
the interface all in Html and hopefully get rid of all the security
issues of trying to run a program in the client.

I have pretty limited web development skills. Heck, I thought applet
development would be most of the skill I would need for this hobby!

Also, and better ideas for making the web site easier to use? I don't
know that this is the best solution.

The web site is The applets are the poologic
calculator and the roi calculator.

Here's some outline code, there is no exception handling and there
are a million other ways of doing it but this covers the basics.

<form action="/pathToSomeServlet" method="post">
    <input type="text" name="field1">
    //more input fields

protected void doPost(HttpServletRequest request, ...){

     HttpSession session = request.getSession();
     String field1 = request.getParameter("field1");
     //get more parameters

     List<Foo> list = processParams(field1, field2, ...);
     List<Foo> list = processParams(HttpServletRequest request);

     session.setAttribute("results", list);
     String forwardTarget = "/someJsp.jsp");
     RequestDispatcher rd = null;
     rd = getServletContext().getRequestDispatcher(forwardTarget);
     rd.forward(request, response);


List<Foo> results = (List<Foo>)session.getAttribute("results");

for(Foo f: results){
    //render f


There are all sorts of frameworks out there, there are all sorts of
custom tags out there and there are a million naysayers and doom mongers
just waiting to pull any solution you come up with to bits.

My philosophy?

Keep It Simple
If it feels good ... do it

Simple is often good

But you could probably make it even simpler by:
- storing data in request instead of session
- use JSTL for display


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