Specify the filename to be used for a file sent by a ServletTag(s): Servlet/JSP
Say that your servlet called ""/servlet/GetFile" send back a file to a client request. That file needs to be saved by the client. If you do nothing, the browser will suggest "GetFile" as the filename.
To specify the correct filename
String filename = "abc.dat" ;
File textFile = new File(filename);
response.setHeader("Content-length",Integer.toString(textFile.length()));
response.setHeader("Content-type","application/octetstream");
response.setHeader("Content-disposition","inline; filename=" + filename );
// open the file and write it in the OutputStream