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Subject: RE: help in using a custom API
Date: Tue, 25 Oct 2005 10:59:09 -0500
Message-ID: 
 <06CCD285B81FAA48AE6A8BE92E2BD87B081B7CB0@sghdqms02.Global.ad.sabre.com>
Thread-Topic: help in using a custom API
Thread-Index: AcXZGsoj0wrfa9QRR1GLzPLEZrBYDwAYA4Kw
From: "Davies, Joshua" <Joshua.Davies@travelocity.com>
To: "Tomcat Users List" <users@tomcat.apache.org>

I'd avoid calling a third-party API from a JSP at all.  Instead, I'd
recommend using an MVC-style approach
(http://www.javaworld.com/javaworld/jw-12-1999/jw-12-ssj-jspmvc.html),
like this:

public class ApiCallingServlet extends HttpServlet
{
	public void doGet( HttpServletRequest req, HttpServletResponse
resp )
		throws ServletException, IOException
	{
		try
		{
			ApiResults results =3D api.call( req.getParameter(
"apiParam1" ),
=09
req.getParameter( "apiParam2" ) );
		=09
			req.setAttribute( "meaningfulParameter1",
results.getMeaningfulParameter1( ) );
req.setAttribute( "meaningfulParameter2",
results.getMeaningfulParameter2( ) );

			ServletContext sc =3D getServletContext( );
			RequestDispatcher rd =3D sc.getRequestDispatcher(
"/jsp/api/ApiUser.jsp" );
			rd.forward( req, res );
		}
		catch ( ApiGeneratedException e )
		{
			throw new ServletException( e );
		}
	}
}=20

/jsp/api/ApiUser.jsp:
<html>
<head>
...
<p>The API gave meaningful result 1 of <%=3D request.getAttribute(
"meaningfulParameter1" ) %></p>
<p>The API gave meaningful result 2 of <%=3D request.getAttribute(
"meaningfulParameter2" ) %></p>
...
</html>=20

This way the example code can be pretty much copied directly into the
servlet's doGet or doPost method and modified from there.

-----Original Message-----
From: Jayel Villamin [mailto:jayel@deakin.edu.au]=20
Sent: Monday, October 24, 2005 11:15 PM
To: users@tomcat.apache.org
Subject: help in using a custom API

Hi. We have bought an IT customer management system to management the=20
helpdesk. It came with a JAVA API.

Here are is thin POS guide and some examples. The problem with the=20
examples is that is uses plain Java (Java run from the commandline).=20
But I need to use it from within a browser. Since my Java is at a=20
beginner's level, I have been reading some online books were my work=20
has accessed to (like O'rielly's JavaServer Pages, 3rd Edition). I=20
have put the API jar file in /shared/lib but I cannot find a way on=20
how to access it from a jsp page.

If anyone can point me to the right direction on how to use this API=20
from within a JSP. I would really appreciate it.

Thank you.

Jayel Villamin, Web Programmer, Information Technology Services Division
+ Deakin University Geelong Victoria 3217 Australia.
( 03 5227 8688 International: +61 3 5227 8688
( 03 5227 8866 International: +61 3 5227 8866
+ jayel@deakin.edu.au
: http://www.deakin.edu.au
Deakin University CRICOS Provider Code 00113B

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