RE: Writing and reading a file in a servlet.

["Bhamani, Nizar A TL56E" <Nizar.Bhamani@ace-ina.com>]

You can use JNDI to retrieve a file path. 

The 'fileName.path' can be stored in your web.xml as :
...........
    <env-entry>
      <env-entry-name>filename.path</env-entry-name>
      <env-entry-value>c:\\temp\\SomeSerializedObject.ser</env-entry-value>
      <env-entry-type>java.lang.String</env-entry-type>
    </env-entry>
..............


Here is the source to read a serialized object :

StringBuffer fileName = new StringBuffer();

try {
	javax.naming.Context initCtx = new InitialContext();
	Context envCtx = (Context) initCtx.lookup("java:comp/env");
	fileName.append((String) envCtx.lookup("fileName.path"));
    }
catch (Exception e)
    {
         e.printStackTrace();
         System.err.println("WARNING! filename.path JNDI not found");
    }

try
    {
         ObjectInputStream s = new ObjectInputStream(new
FileInputStream(fileName.toString()));

         defaultObject = s.readObject();
     }
catch (Exception e)
     {
         System.err.println("Couldn't find serialized file : " +
fileName.toString());
     }


Nizar Bhamani

-----Original Message-----
From: Lee Chalupa [mailto:lchalupa@seelink.org] 
Sent: Tuesday, June 17, 2003 2:19 PM
To: Ajug Members
Subject: Writing and reading a file in a servlet.


I need some direction:
 
In a servlet, I'm trying to serialize an object to a file.

I've been trying to use the same approach as I would if I was writing a 
java application.
I've been trying to provide a path to FileOutputStream to create this file.
It's not working.  It is having trouble finding the path.
 
I suspect I need to do something different within a servlet environment.  I 
know that ServletContext has the getResource method that will return a URL 
but I don't understand if there is a way to use this URL to write to the 
file.
 
How should I go about writing to and reading from a file within a Servlet 
environment?
 
Thanks
 
Lee