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Mark Wilson
Dynamic include of multiple files
1 Answer(s)      2 years and a month ago
Posted in : JSP-Servlet


I want to include a series of small files, based on a string. For instance, if the string was: String fileString="a b c d e"; I would split it into an array, fileArray, and do something like the following:

for (i=0; i < fileArray.length; i++) {
 include "./" + fileArray[i] + ".inc.jsp";
}

Since each included file (in this case) is going to be a call to a table-building routine, each will look something like this:

out.write(myTableFunction(SourceName, sourceElement, "fieldname", "cname",
new String [] { "errorField" },
new String [] { "Hdr1", "Hdr2", "Hdr3", "Hdr4" },
new String [] { "fld1", "fld2", "fld3", "fld4" },
new int[] { flag1, flag2, flag3, flag4 }
))

The idea is that the list of tables to be built will change pretty often, and by simply updating the list of filenames, I can change which tables are built, and in which order. I've attempted things like:

for (i=0; i < fileArray.length; i++) {
 String fn = "./" + fileArray[i] + ".inc.jsp";
 %><jsp: include '<%= fn %>' /><%
}

But that throws various errors, such as undefined variables (sourceElement). Is what I'm basically trying to do even theoretically possible? Does anyone have any examples of something similar working? (Sorry I can't post actual code, but the project is on a closed intranet.)


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September 4, 2012 at 8:52 PM


I think the include HAS to be an include directive, to make the included code work properly, recognize variables, etc:

<%@ include file="myfile.jsp" %>

This works perfectly. However, what I need is to be able to (1) make the file name be a variable value, and then (2) do that in a loop.

So, IF I could do something LIKE the following, I'd be as far as #1:

<%
String fn = "myfile.jsp"
%>
<%@ include file=fn %>

The error message says it's looking for quotes; putting quotes doesn't help, since there's no file "fn".

Any way to do this, or does the file name value HAVE to be a static piece of code?



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