input files
Hi there,
I'm trying to read in an input file with a jsp file. The reading itself is done by a class that is imported by the jsp file.
Now this all works fine, but the problem is that he can't find the specific input file
Does anyone now where I have to place the input file on the server (using tomcat5.5) .
I tried to place it in the same directory where I strored the .class file that wants to read it. Unfortunenately it it's not working
I hope someone really can help me out.
thank you in advance
Message was edited by:
mol-mol
[595 byte] By [
mol-mola] at [2007-10-3 0:54:17]
The path of files differs depending on whether you access the the class directly (through a compiler or command line), or through Tomcat.
You may find the following links useful, I used the first one to solve this problem by printing out the user.home property, telling me what the current working directory was. Through this i realised my classes were operating out of different locations, depending on whether I instantiated the class through my compiler, or through Tomcat.
Another tip I would offer is to use the file.separator and path.separator, properties instead of hard coding, that way, if you move to a different operating system your app will still work!!
http://www.scit.wlv.ac.uk/appdocs/java/api/java/lang/System.html
http://tomcat.apache.org/tomcat-5.5-doc/catalina/docs/api/org/apache/catalina/util/ProcessEnvironment.html
The best option is to use the ServletContext's getResourceAsStream() method. And the context begins with a "/". So if you have placed your file in say the WEB-INF directory and your file name is 'inputFile.something', then
InputStream is = context.getResourceAsStream("/WEB-INF/inputFile.something");
returns an input stream object that you can wrap around say a BufferedReader to read the file.
If it was placed in a folder called 'myFiles' which is on the top level (the same level as your WEB-INF) directory, you would
InputStream is = context.getResourceAsStream("/myFiles/inputFile.something");
and if the myFiles directory was a step below, say under the WEB-INF directory, then use
InputStream is = context.getResourceAsStream("/WEB-INF/myFiles/inputFile.something");
The catch in all of the above is that you'll have to have access to the ServletContext object. This is readily available in a servlet using the getServletContext() method or in a jsp as the application object.
In other classes, you'll have to pass the context object along after having retrieved them from a Servlet or a jsp.
ram.
Hi Ram,
Is it possible to access these values directly from the class.
When using connection pooling I used
try
{
this.ctx = new InitialContext();
this.ds = ( DataSource ) ctx.lookup( "java:comp/env/jdbc/TestDB" );
}
To access a connection pool, can the same method be used here, making the class less dependant on jsp?
I am not sure that I understand you correctly.Are you suggesting that you use the jndi context to look up the files (just like how you used jndi to retrieve a handle to the connection pool)?ram.
Hi ram,/WEB-INF/filename, I think doesn't really fetch the file u actually want to access.Isn't it /Application/WEB-INF/filename?Correct me if I'm wrong.Cheers Mouli
Hi mol-mol,I think the problem is with the file path.Get "real path" of the file, and try to read it. I hope it'll work:-)Raj
> I am not sure that I understand you correctly.
>
> Are you suggesting that you use the jndi context to
> look up the files (just like how you used jndi to
> retrieve a handle to the connection pool)?
>
> ram.
No, just to look up Tomcats working directory.
BTW, I put read in files in thier own separate directory under the web-app (the root of your website) folder
> > I am not sure that I understand you correctly.
> >
> > Are you suggesting that you use the jndi context
> to
> > look up the files (just like how you used jndi to
> > retrieve a handle to the connection pool)?
> >
> > ram.
>
> No, just to look up Tomcats working directory.
Use jndi to look up the connection pool - remember that is an object (a collection of connections) bound to a registry accessible via jndi.
Looking up a file is different and there are different ways to achieve it. I would recommend the method in the ServletContext object. But sure there are other ways.
ram.
