Solved

Checking for validity of an include

Posted on 2003-12-01
7
343 Views
Last Modified: 2013-11-18
If  ihave the below code and want to check if the include is valid and not null, can this be done?

for example, if I pass an invalid include name that is not the correct name, can I catch this and not throw an error?

//////////////////////////////

Code
/////////////////////////////

<% String incName = request.getParameter("incName"); %>

<%
  if( incName != null )
  {
      String varincludefile ="includes/" + incName; %>

     <jsp:include page="<%=varincludefile%>" flush="true" />
<%
  }
%>

///////////////////////////////////////////////

I want incName to be a valid include name. How do I check this?
0
Comment
Question by:894359
  • 3
  • 3
7 Comments
 
LVL 92

Expert Comment

by:objects
ID: 9854342
jsp:include's are processed at request time so you shopuld be able to do that.
What you want to do is check for the existence of the file, perhaps using getRealPath() to get the file path of the include and check it exists.
0
 
LVL 92

Expert Comment

by:objects
ID: 9854352
something like:

<%
  if( incName != null )
  {
      String varincludefile ="includes/" + incName; %>
      File inc = application.getRealPath(varincludefile);
      if (inc.exists())
      {
%>
          <jsp:include page="<%=varincludefile%>" flush="true" />
<%
      }
   }
%>
0
 
LVL 27

Expert Comment

by:rrz
ID: 9854951
>File inc = application.getRealPath(varincludefile);
more like  
File inc = new File(application.getRealPath(varincludefile));
0
Efficient way to get backups off site to Azure

This user guide provides instructions on how to deploy and configure both a StoneFly Scale Out NAS Enterprise Cloud Drive virtual machine and Veeam Cloud Connect in the Microsoft Azure Cloud.

 
LVL 92

Expert Comment

by:objects
ID: 9854969
woops :)
0
 
LVL 14

Accepted Solution

by:
kennethxu earned 500 total points
ID: 9855200
According to servlet/jsp specification, there is nothing going to happen if the including resource not exists.
I had verified this in tomcat. will check against weblogic and websphere and get back.

application.getRealPath will always return null when the webapp is deployed as web application archive file (war), so use with caution.
0
 
LVL 14

Expert Comment

by:kennethxu
ID: 9855222
My point is there is no need to check anything.
0
 
LVL 14

Expert Comment

by:kennethxu
ID: 9860443
result:
Tomcat 4, Weblogic 8, WebSphere 5 work as to spec.

Tomcat 3: exception (different exception in subversions)
WebSphere 4: 404 Not Found error message on page.

0

Featured Post

ScreenConnect 6.0 Free Trial

Explore all the enhancements in one game-changing release, ScreenConnect 6.0, based on partner feedback. New features include a redesigned UI, app configurations and chat acknowledgement to improve customer engagement!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Article by: Matthew
I am a very big proponent of technology compliance standards and strive to meet such criteria in all of my work. That includes my site, which is 100% XHTML 1.0 compliant as determined by the World Wide Web Consortium. https://www.matthewstevenkel…
There are two main kinds of selectors in CSS: One is base selector like h1, h2, body, table or any existing HTML tags.  For instance, the following rule sets all paragraphs (<p> elements) to red: (CODE) CSS also allows us to define our own custom …
The viewer will learn how to dynamically set the form action using jQuery.
The viewer will learn the benefit of using external CSS files and the relationship between class and ID selectors. Create your external css file by saving it as style.css then set up your style tags: (CODE) Reference the nav tag and set your prop…

770 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question