asked on

reading parameter out of the servlet context

Hello,

I am doing this assignment.

make a servlet of JSP page that reads the company name from init parameters and stores it in the servlet context. Have another page use the same company name by reading it out of the servlet context(not from init parameters). Be sure nothing bad happens if someone tries to access the second page before the first.

Here is what I did so far.
I added the following in web.xml.

...
<servlet-name>InitPage</servlet-name>
<jsp-file>/InitPage.jsp</jsp-file>
       <init-param>
       <param-name>companyName</param_name>
       <param-value>ABC</param-value>
       </init-param>
<servlet-mapping>
<servlet-name>InitPage</servlet-name>
<url-pattern>/InitPage.jsp</url-pattern>
</servlet-mapping>

this is InitPage.jsp:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> HW#8 - #3</TITLE>

</HEAD>
<BODY>
<LI> Company Name: <%= companyName %>
<%!
      private String companyName;
      public void jspInit() {
            ServletConfig config = getServletConfig();
            companyName = config.getInitParameter("companyName"); }
%>
</BODY>
</HTML>

I guess this will read the company name from init parameters and stores it in the servlet context. Now, how do I make another page uses the same company name by reading it out of the servlet context?

thanks,

ASKER CERTIFIED SOLUTION

Mick Barry

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Mick Barry

I generally use a servlet to copy the init parameter into the application context (on startup).

dkim18

ASKER

I just got null for company name.

<BODY>
<H2>Init Parameter</H2>
<LI> Company Name: <%= application.getAttribute("ABC") %>
</BODY>
</HTML>

Mick Barry

you still need to copy the init param into the servlet context at startup.

application.setAttribute(config.getInitParameter("companyName"));

dkim18

ASKER

Did you mean like this in InitPage.jsp?

<%!
      private String companyName;
      public void jspInit() {
            ServletConfig config = getServletConfig();
            companyName = config.getInitParameter("companyName");
            application.setAttribute(config.getInitParameter("companyName"));
      }
%>

It didn't work by the way...

Mick Barry

I always use a servlet to do this sort of thing.

If you are accessing the company name from anoither jsp page, then you'll do to have whatever does the copy loaded at startup.