Re: [OT] Servlet Filtering & performance..

[Christopher Schultz]

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prt,

prt wrote:
> I have another problem,

You should post a separate message in this case.

> I save uploaded images(by users)  in folder place at "D:\storeg\data\uf\".
> So when the URL is "http://localhost/test/uf/xyz.jpg"; then is redirect to
> "D:\storeg\data\uf\xyz.jpg" 

I assume you mean "it is mapped to d:\..."... redirecting to a local
file path won't work unless you are running your browser from the
application server.

> And that so because i configure in server.xml this part between the host
> tag,
> <Context path="/uf" docBase="D:\storeg\data\uf" debug="0"
> crossContext="false"/>
> 
> Is there way that i can do that by using the filter, how can i redirect the
> request from the filter when is "/uf..." to
> "D:\storeg\data\uf..." with out loading the image and print it out from the
> filter ?

You have two options:

1. Map a directory into your URL space (not sure how to do that in
   Tomcat, but I'm sure that's been covered in the archives).

2. Write an image-serving servlet. Something like this:

<servlet-mapping>
   <url-pattern>/ug/*</url-pattern>
   <servlet-name>imageServlet</servlet-name>
</servlet-mapping>

Your servlet class, written in loose pseudocode:

doGet()
{
 String filename = request.getExtraPathInfo();

 // You should check for ".." and other evil-looking paths

 filename = "D:/storeg/data/ug/" + filename;

 File f = new File(filename);

 response.setContentType("whatever/is+appropriate");
 response.setContentLength(f.length());

 FileInputStream in = new FileInputStream(filename);
 OutputStream out = response.getOutputStream();

 byte[] buffer = new byte[1024];
 int count = 0;
 while(1024 == (count = in.read(buffer)))
    out.write(buffer);
 out.write(buffer, 0 count);
 in.close();
 out.close();
}

Hope that helps,

- -chris
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