Servlet Java Tutorial

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;
import java.net.*;
public class MyServlet extends HttpServlet {
   
  public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    
      String fileName = (String) request.getParameter("file");
      if (fileName == null || fileName.equals(""))
           throw new ServletException(
            "Invalid or non-existent file parameter in UrlServlet servlet.");
      
      if (fileName.indexOf(".pdf") == -1)
          fileName = fileName + ".pdf";
        
      URL pdfDir = null;
      URLConnection urlConn = null;
      ServletOutputStream stream = null;
      BufferedInputStream buf = null;
     try{
     
       pdfDir = new URL(getServletContext().getInitParameter("remote-pdf-dir") + fileName);
    
    } catch (MalformedURLException mue){
    
           throw new ServletException(mue.getMessage());
   }
   try{
          
     stream = response.getOutputStream();
      response.setContentType("application/pdf");
      response.addHeader(
        "Content-Disposition","attachment; filename="+fileName );
      
      urlConn = pdfDir.openConnection();
      response.setContentLength( (int) urlConn.getContentLength()  );
     
     buf = new BufferedInputStream(urlConn.getInputStream());
     int readBytes = 0;
     while((readBytes = buf.read()) != -1)
        stream.write(readBytes);
     } catch (IOException ioe){
     
        throw new ServletException(ioe.getMessage());
         
     } finally {
     
     if(stream != null)
         stream.close();
      if(buf != null)
          buf.close();
          }
    
    }
   
    public void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        
        doGet(request,response);
    } 
}


    PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN"
    "http://java.sun.com/j2ee/dtds/web-app_2_2.dtd">

    MyServletName
             MyServlet
             
    

    
    MyServletName
        /index.html