Re: Servlet to download a file returning errors

From:
Lew <noone@lewscanon.com>
Newsgroups:
comp.lang.java.help
Date:
Fri, 18 Jun 2010 07:41:37 -0400
Message-ID:
<hvfm0d$p06$1@news.albasani.net>
On 06/18/2010 03:42 AM, K Gaur wrote:

Hello All,

I wrote following servlet to download a file:
__________________________________________
package controller;

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

class DownloadServ extends HttpServlet{

public void doGet(HttpServletRequest request, HttpServletResponse
response) throws ServletException, IOException{

  response.setContentType("application/pdf");

   ServletContext ctx=getServletContext();
   InputStream is=ctx.getResourceAsStream("/
21stCenturyTiger_Christmas_wishes_2009.pdf");

  int read=0;
  byte[ ] bytes=new byte[1024];

  OutputStream os=response.getOutputStream();

  while((read=is.read(bytes)) != -1){
    os.write(bytes,0,read);
  }

  os.flush();
  os.close();
}
}
_________________________________________________________

But it is showing the following error in browser:

________________________________________________________
exception

javax.servlet.ServletException: Error instantiating servlet class
com.example.web.DownloadServ


Why does the error message say that the error is with
'com.example.web.DownloadServ' when you show the source for
'controller.DownloadServ'?

Why do you initialize variables 'read' and 'bytes' to values you simply throw
away?

--
Lew

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