protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String filename = "D:\\Document\\music\\Monica.mp3";
String contentType = this.getServletContext().getMimeType(filename);
String contentDisposition = "attachment;filename=Monica.mp3";
FileInputStream input = new FileInputStream(filename);
response.setHeader("Content-Type", contentType);
response.setHeader("Content-Disposition", contentDisposition);
ServletOutputStream output = response.getOutputStream();
IOUtils.copy(input,output);
input.close();
}