How to by using an Init Servlet.
Some examples, since explaining would take too long :
Java startup servlet
---------------------------cut---------------------------
package org.init.whatever;
import javax.servlet.*;
import javax.servlet.http.*;
public class InitServlet extends HttpServlet {
public void init(ServletConfig config) throws ServletException {
super.init(config);
//DO WHATEVER YOU NEED TO DO HERE
//config.getServletContext().setAttribute("states","some object with
states in it");
}
public void destroy() {
}
/** Processes requests for both HTTP <code>GET</code> and
<code>POST</code> methods.
* @param request servlet request
* @param response servlet response
*/
protected void processRequest(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, java.io.IOException {
//do nothing
}
/** Handles the HTTP <code>GET</code> method.
* @param request servlet request
* @param response servlet response
*/
protected void doGet(HttpServletRequest request, HttpServletResponse
response)
throws ServletException, java.io.IOException {
processRequest(request, response);
}
/** Handles the HTTP <code>POST</code> method.
* @param request servlet request
* @param response servlet response
*/
protected void doPost(HttpServletRequest request, HttpServletResponse
response)
throws ServletException, java.io.IOException {
processRequest(request, response);
}
/** Returns a short description of the servlet.
*/
public String getServletInfo() {
return "Init ME";
}
}
----------------------------------------------------------------cut
again-----------------
in you web.xml:
---------------------------------cut cut --------------------
<servlet>
<servlet-name>Init Servlet</servlet-name>
<display-name>Init Servlet</display-name>
<description>Servlet to initialize whatever</description>
<servlet-class>org.init.whatever.InitServlet</servlet-class>
<init-param>
<param-name>param1</param-name>
<param-value>WEB-INF/maybe.some.file.if.you.need.such.a.thing.properties</param-value>
</init-param>
<load-on-startup>3</load-on-startup>
</servlet>
---------------------------------/cut cut --------------------
Is it clearer or as mud ?
Jf
Eddie Bush wrote:
> Michael,
>
> I'm currently building some functionality on top of Struts for a
> project. The way I found to do this the easiest was to keep my config
> in an XML file and use the commons digester in a Plugin. Plugin
> writing is very straight-forward, and there are a couple of standard
> examples (TilesPlugin/ValidatorPlugin) out there for you to look at.
> Personally, when I started in, I looked at the ValidatorPlugin. It's
> much shorter and covered everything I cared about.
>
> Day, Michael-IBM/TT wrote:
>
>> This is probably one of the stupidest questions, but I don't know how
>> to do something once during application startup.
>>
>> For instance, if I wanted a bean to hold a list of states, how would
>> I create that once during startup?
>>
> Note: If you needed to get persistent stuff out of a database, you
> could do your DB-access here to load your beans.
>
> HTH
>
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