An example of how to use resource-ref tag is provided at the following location..


http://onjava.com/pub/a/onjava/excerpt/jsvltjspckbk_chap01/index.html?page=2

An example of how to use resource-env-ref tag in the DD is provided at the following location...

http://tomcat.apache.org/tomcat-5.5-doc/jndi-resources-howto.html

A servlet may need to know which MIME type a file extension corresponds to , and such a mapping needs to be specified as follows..

<mime-mapping>
       <extension>txt</extension>
        <mime-type>text/html</mime-type>
</mime-mapping>

In the service/doGet/doPost methods, use the following code to determine the mimetype of the file

String mimeType=this.getServletContext().getMimeType("pathOfTheFile.txt");
response.setContentType(mimeType);