Dear All,
In my Application i am downloading a file. on button click using servlet.
after clicking the button servlet called and download dialog box opens with open / save and cancel button.
i want to trace these button events.
on open or save i want to update status 'true' in to database and on cancel button i want to update status false for agian download.
to download a file code is given below ..
Code for index page
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<form method="post" action="DownloadFile">
<table>
<tr>
<td colspan="2">
<input type="submit" value="Download">
</td>
</tr>
</table>
</form>
</body>
</html>
code of servlet i am calling on button click
/*
* DownloadFile.java
*
* Created on October 20, 2008, 5:46 PM
*/
import java.io.*;
import java.net.*;
import javax.servlet.*;
import javax.servlet.http.*;
/**
*
* @author 72737
* @version
*/
public class DownloadFile extends HttpServlet {
private String original_filename = "MYFILE.txt";
private String filename="D:\\ABC.txt";
/** Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
* @param request servlet request
* @param response servlet response
*/
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
File f = new File(filename);
int length = 0;
ServletOutputStream op = response.getOutputStream();
ServletContext context = getServletConfig().getServletContext();
String mimetype = context.getMimeType( filename );
//
// Set the response and go!
//
//
response.setContentType( (mimetype != null) ? mimetype : "application/octet-stream" );
response.setContentLength( (int)f.length() );
response.setHeader( "Content-Disposition", "attachment; filename=\"" + original_filename + "\"" );
//
// Stream to the requester.
//
byte[] bbuf = new byte[filename.length()];
DataInputStream in = new DataInputStream(new FileInputStream(f));
while ((in != null) && ((length = in.read(bbuf)) != -1))
{
op.write(bbuf,0,length);
}
in.close();
op.flush();
op.close();
}
// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
/** Handles the HTTP <code>GET</code> method.
* @param request servlet request
* @param response servlet response
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/** Handles the HTTP <code>POST</code> method.
* @param request servlet request
* @param response servlet response
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/** Returns a short description of the servlet.
*/
public String getServletInfo() {
return "Short description";
}
// </editor-fold>
}
Thanks
Unsolved 
