Force download not working for MS Office files: download, force, jsp, file

Force download not working for MS Office files

I have created a JSP page to force the download of different types of files. PDF, TXT and ZIP files download perfectly, however DOC, XLS PPT and TIFF files do not - they download but then are not correctly interpreted by the application. A Word doc, for example, looks like:

ÐÏ à¡± á > þÿ ! # þÿÿÿ ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿì¥Á ð ¿ 0

For the XLS, DOC and PPT files, I get the same result if I set the MIME Type to APPLICATION/OCTET-STREAM, APPLICATION/STREAM, and APPLICATION/UNKNOWN. I've confirmed that there is nothing wrong with the files themselves. Interestingly, if I zip the file it downloads AND opens correctly!

Here's my code (The code comes largely from a number of answers on this site - thanks especially to cheekyci):

<%@ page import="java.util.*,java.io.*"%>
<%
String filePath = this.getServletContext().getRealPath("/") + "/doc/";
String fileName = request.getParameter("file");

//determine MIME type based on fileName extension
String extension = fileName.substring(fileName.indexOf(".")+1);
String mimeType;
if (extension.equals("xls")) {
mimeType="APPLICATION/VND.MS-EXCEL";
}
else if (extension.equals("doc")) {
mimeType="APPLICATION/MSWORD";
}
else if (extension.equals("ppt")) {
mimeType="APPLICATION/VND.MS-POWERPOINT";
}
else if (extension.equals("tiff")) {
mimeType="IMAGE/TIFF";
}
else {
mimeType="APPLICATION/STREAM";
}
File downloadFile = new File(filePath+fileName);
try {
if (downloadFile.exists()) {
//set response headers to force download
response.setContentType(mimeType);
response.setHeader("Content-Disposition","attachment; filename=\""+ fileName + "\"");

//stream out file
FileInputStream fInputStream =new FileInputStream(filePath+fileName);
ServletOutputStream fOutputStream = response.getOutputStream();
int i;
while ((i=fInputStream.read()) != -1) {
fOutputStream.write(i);
}
fInputStream.close();
fOutputStream.close();
}
else {
System.out.println("File not found @"+filePath+fileName);
}
} catch (Exception exp){
System.out.println("Exception: "+exp.getMessage());
}
%>

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Force download not working for MS Office files

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