Re: Making a directory visible to tomcat

[Rashmi Rubdi <ra...@gmail.com>]

On 5/29/07, Peter Dawn <pe...@gmail.com> wrote:
> guys,
>
> i am using tomcat 5.0. now i have created a file on my server at
> C:\data\packet.xml. when somebody accesses my web app remotely, i want
> the user to type in http://ipaddress:8080/packet.xml to be able to
> access this file.

One way to access the XML file at http://ipaddress:8080/packet.xml is
to write either a Filter or a Servlet, and specify /packet.xml as the
URL mapping for this Filter or Servlet in web.xml

And inside the Filter or Servlet, you would use Java I/O to access a
file that is outside the web application's context (in your case root
context).

For example:

---------------------------------------------------------------------------------
ShowPacketXMLFilter.java
---------------------------------------------------------------------------------
package somepackage;

import javax.servlet.*;
import java.io.*;

public class ShowPacketXMLFilter implements Filter {

    public void init(FilterConfig filterConfig) throws ServletException {

    }

    public void doFilter(ServletRequest servletRequest,
ServletResponse servletResponse, FilterChain filterChain) throws
IOException, ServletException {

        servletResponse.setContentType("application/xhtml+xml");

        PrintWriter out = servletResponse.getWriter();

        BufferedReader br = new BufferedReader(new
FileReader("C:/data/packet.xml"));

        String line;

        while ((line = br.readLine()) != null) {

            out.println(line);

        }
    }

    public void destroy() {

    }
}

--------------------------------------------------------------------------
web.xml
--------------------------------------------------------------------------

    <filter>
        <filter-name>ShowPacketXMLFilter</filter-name>
        <filter-class>somepackage.ShowPacketXMLFilter</filter-class>
        <description>
            This filter reads packet.xml from disk
            and displays it's content at /packet.xml
        </description>
    </filter>

    <filter-mapping>
        <filter-name>ShowPacketXMLFilter</filter-name>
        <url-pattern>/packet.xml</url-pattern>
    </filter-mapping>

> can somebody please tell me how i can make a directory outside the
> installation folder visible to tomcat.

With Java I/O API you will be able to access any file , even if it is
outside the web application's context.

I don't know if there's a way to access any file outside the web app's
context using Servlet API , others may know.

>
> thanks
>

-Rashmi

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