On Tue, 29 Jul 2003, Davide Bruzzone wrote:
> Date: Tue, 29 Jul 2003 11:57:41 -0600
> From: Davide Bruzzone <[EMAIL PROTECTED]>
> Reply-To: Struts Users Mailing List <[EMAIL PROTECTED]>
> To: Struts Users Mailing List <[EMAIL PROTECTED]>
> Subject: Opening/reading a file from a Struts application...
>
> Greetings all...
>
> I'm trying to load and read a text file (on the server's filesystem)
> from within a Struts application. I'd like to be able to put the file in
> the WEB-INF, or the WEB-INF/classes directory, but am having trouble
> finding the file (i.e. I'm having trouble obtaining the path that I need
> in order to open the file), and reading it...
>
> Here's what my research has turned up:
>
> // Something like this will return an InputStream. This is fine for
> properties files
> // since you can load a properties file by passing an InputStream to the
> load method
> // on a Properties object
> Thread.currentThread().getContextClassLoader().getResourceAsStream("my.p
> roperties");
>
This only works on files visible to the class loader (i.e. files in
/WEB-INF/classes, or packaged in JARs inside /WEB-INF/lib). To read
general resources in your webapp, try ServletContext.getResourceAsStream()
instead. You pass it a context-relative path like
"/WEB-INF/my.properties".
> The problem with this is that the methods that I'm using to read the
> contents of files takes either a string that represents the file name,
> or a File object... The methods then calculate the file's length, read
> the file into an array of bytes, and return the contents of the array in
> various forms (i.e. An array of bytes, a string, etc.).
>
That's not going to be portable, because you cannot assume that webapp
resources actually live in the filesystem - you might be running straight
from a WAR file, or in a container that puts all the static resources in
BLOBs in a database, or ...
If you really need file i/o access to this stuff, you should create an
initialization parameter pointing at the directory containing the relevant
files, and then access then outside your webapp hierarchy.
> Does anyone have any suggestions about how best to go about doing this
> (I could change the methods that read the contents of files into
> strings, but I'm not sure exactly how to go about doing this).
>
> Any help would be greatly appreciated...
>
> Cheers...
>
> Dave
>
Craig
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