Re: displaying an image from outside the webapps directory

[Lars Nielsen Lind]

Kimberly Begley skrev:
Hi,
I'm trying to make a jsp display a plot that is a jpeg in a directory
outside the catalina_home directory - I do not have the option of
putting it in the webapp directory (there's 1000's of them - my page
will just display one of them as selected by the user - along with
some other info) - how do I go about displaying it?
Thanks
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You can do that with a Servlet. Here are some sample code. Replace 
content of <> with your own data.



package <package name>;

import java.io.*;
import java.util.*;

import javax.servlet.*;
import javax.servlet.http.*;

public class OpenFile extends HttpServlet {
  
   private String documentHome = ".";
   private String page = "";
   private String version = "";
   private String remotehost = "";
   private String remoteaddress = "";
  
   protected File findFile(HttpServletRequest request) throws IOException {
       File file = new File(<filename>);
      
       return file;
   }
  
   protected void sendFile(File file, HttpServletResponse response) 
throws IOException {
       int c = 0;
       FileInputStream fis = null;
      
       try {
           ServletOutputStream sos = response.getOutputStream();
           fis = new FileInputStream(file);
          
           while ((c = fis.read()) != -1) {
               sos.write(c);
           }
          
           sos.flush();
       } finally {
           if (fis != null) {
               fis.close();
           }
       }
   }
  
   public void service(HttpServletRequest request, HttpServletResponse 
response) throws ServletException, IOException {
       ServletConfig config = getServletConfig();
       ServletContext application = config.getServletContext();
       File file = findFile(request);
      
       if (file == null) {
       } else {
          
           
response.setContentType(application.getMimeType("application/" + 
file.getName()));
           response.setContentLength((int)file.length());
           response.setHeader("Content-Disposition", "attachment; 
filename = " + file.getName());
           sendFile(file, response);               
       }
   }
  
}

Hope that this is useful.

regards,

Lars Lind

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