Force "Save file" dialog on the JSP page

If you want to force pop up "Save File" dialog to ask user save file from server.

We need to set the several parameter toresponse.

the first is content type.

response.setContentType("application/pdf"); // the type is the file type you want to user to save.

Another is content disposition.

This is very important when you want to force the save dialog. not matter if the browser has assicate some file type to open in the browser.

response.setHeader("Content-Disposition", "attachment;filename=\"somename\"");

Notice: attachment is very important here since it's force prompt the save file dialog.