How to do for multi access for open excle file in browser?

I would like to know how to open multi file of excel on web. Now I can create a file and open it on web already but I can open it only one excel page. when I try to open it more than one, the content of excel file will be move to the new page.

** I have tried to test it, if I have two form to post data to two servlet for each form, I can open two excel file in browser. but I have only one servlet, and I want to open it more than one page. it's not work with one servlet. I don't know how to do. Please help me if you know how to do !!!!

I have used tag form to post data to xml file then it go to servlet.

>>
<Form name="form" action="srv-xlsdata" method="POST" target="_blank">


>> servlet File

public abstract class AbstractExcelView extends HttpServlet {

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

doPost(request, response);
}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
try {
HSSFWorkbook workbook = null;

long start = System.currentTimeMillis();
File newFile = null;

if (getTemplatePath(request) != null) {
String path = getServletContext().getRealPath(getTemplatePath(re quest));


POIFSFileSystem fs = new POIFSFileSystem(new FileInputStream(path));
workbook = new HSSFWorkbook(fs);

} else {
workbook = new HSSFWorkbook();
}

buildWorkbook(request, workbook);

String filename = getOutputFilename(request);
if (filename.toLowerCase().endsWith(".xls")) {

filename = filename.substring(0, filename.length() - 4);
}

OutputStream ostream = response.getOutputStream();

response.setContentType("application/vnd.ms-excel");

workbook.write(ostream);

ostream.close();

} catch (Exception e) {
throw new ServletException("Unable to build Excel Document", e);
}
}

Now I know how do I do...
I have to create new pattern for each servlet name.
It's work!!!!
So now I can open excel in browser more than 1 page.

What patterns did you use ???