How to open a ".doc" file with ms word directly with this servlet?

Question

Here is a servlet for opening a word or a excel or a powerpoint or a pdf file,but I don't want the "file download" dialog appear,eg:when i using this servlet to open a word file,i want open the ".doc" file with ms word directly,not in IE or save.
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
public class OpenWord extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request,response);
public void doPost(HttpServletRequest req,HttpServletResponse res) throws ServletException, IOException {
String strFileName = req.getParameter("filename");
int len = 0;
String strFileType1 = "application/msword";
String strFileType2 = "application/vnd.ms-excel";
String strFileType3 = "application/vnd.ms-powerpoint";
String strFileType4 = "application/pdf";
String strFileType = "";
if(strFileName != null) {
     len = strFileName.length();
     if(strFileName.substring(len-3,len).equalsIgnoreCase("doc")) {
          strFileType = strFileType1;
     } else if(strFileName.substring(len-3,len).equalsIgnoreCase("xls")) {
          strFileType = strFileType2;
     } else if(strFileName.substring(len-3,len).equalsIgnoreCase("ppt")) {
          strFileType = strFileType3;
     } else if(strFileName.substring(len-3,len).equalsIgnoreCase("pdf")) {
          strFileType = strFileType4;
     } else {
          strFileType = strFileType1;
if(strFileName != null) {
     ServletOutputStream out = res.getOutputStream();
     res.setContentType(strFileType); // MIME type for word doc
//if uncomment below sentence,the "file download" dialog will appear twice.
     //res.setHeader("Content-disposition","attachment;filename="+strFileName);
     BufferedInputStream bis = null;
     BufferedOutputStream bos = null;
     String path = "d:\\"; //put a word or a excel file here,eg a.doc
     try {
     File f = new File(path.concat(strFileName));
     FileInputStream fis = new FileInputStream(f);
     bis = new BufferedInputStream(fis);
     bos = new BufferedOutputStream(out);
     byte[] buff = new byte[2048];
     int bytesRead;
     while(-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
     bos.write(buff, 0, bytesRead);
     } catch(NullPointerException e) {
     System.out.println ( "NullPointerException." );
     throw e;
     } catch(FileNotFoundException e) {
     System.out.println ( "FileNotFoundException." );
     throw e;
     } catch(final IOException e) {
     System.out.println ( "IOException." );
     throw e;
     } finally {
     if (bis != null)
     bis.close();
     if (bos != null)
     bos.close();

Answer 1

Hello!
Does some one of you had open a MS word file (.doc) in Java search for a token like [aToken] replace it with another text and then feed it to a stream of save it?
I want to build a servlet to open a well formatted and rich on media (images) ms word document search for tokens and replace them with information form a web form.
Any Ideas?
Thank you in advanced.