Re: open a file outside JSP

From:
Lew <lew@lewscanon.com>
Newsgroups:
comp.lang.java.programmer
Date:
Fri, 18 Jan 2008 20:56:43 -0500
Message-ID:
<xN2dnWn1a4hBxQzanZ2dnUVZ_gKdnZ2d@comcast.com>
nashaccount wrote:

I wonder if any of you have done some programming just to open a file
from a JSP. My JSP code is inside a .war file and the file that I
want to open is outside the war file.


Where "outside the war [sic] file" is the file you want to open?

It kills application portability to hard-code path references into your
source. You should put the location of the file you want to open in your
deployment descriptor or some such resource (property file, etc.).

You can open arbitrary files with getResource() or getResourceAsStream().

If the file is within your application (i.e., inside a resource directory
underneath the application context root) things are much easier - you can use
relative paths.

<http://java.sun.com/javase/6/docs/api/java/lang/Class.html#getResource(java.lang.String)>
<http://java.sun.com/javase/6/docs/api/java/lang/Class.html#getResourceAsStream(java.lang.String)>

<http://java.sun.com/javase/6/docs/api/java/lang/ClassLoader.html#getResource(java.lang.String)>
<http://java.sun.com/javase/6/docs/api/java/lang/ClassLoader.html#getResourceAsStream(java.lang.String)>

<http://java.sun.com/javaee/5/docs/api/javax/servlet/ServletContext.html#getResource(java.lang.String)>
<http://java.sun.com/javaee/5/docs/api/javax/servlet/ServletContext.html#getResourceAsStream(java.lang.String)>

Each of the three variants of these methods has a slightly different idea
about the classpath (the search path by which it finds the resource).

--
Lew

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