Get Web App root from Spring Controller

Question

I am trying to write an uploaded multipart file to the filesystem. I have a directory called audio which sits in the root of my web application (not inside WEB-INF, but beside it, to it's publicly accessible like css and javascript).

I want to write the uploaded file to that directory but I can't seem to get the path I need. I thought getting a ServletContext() then using realPath() may work, but I don't have a reference to ServletContext through a Spring controller. Thanks for any hep

@RequestMapping(value="/uploadSample")
public ModelAndView upload(HttpServletRequest request, HttpServletResponse response, @RequestParam("file") MultipartFile f) {

    if (f == null) {
        return new ModelAndView("upload", "msg", "The file is null.");
    }
    try {
        // I need to set AUDIO_PATH to <webAppRoot>/audio
        FileOutputStream file = new FileOutputStream(AUDIO_PATH + "/" + f.getOriginalFilename());
        file.write(f.getBytes());
        file.close();
    }
    catch (FileNotFoundException ex) {
        Logger.getLogger(SampleUploadController.class.getName()).log(Level.SEVERE, null, ex);
    }
    catch (IOException ex) {
            Logger.getLogger(SampleUploadController.class.getName()).log(Level.SEVERE, null, ex);
    }



   return new ModelAndView("upload", "msg", "File ( " + f.getOriginalFilename() + ") successfully uploaded.");
}

}

Answer 1

I thought getting a ServletContext() then using realPath() may work, but I don't have a reference to ServletContext

Yes you do. See HttpServletRequest.getSession().getServletContext()

Answer 2

To get reference to ServletContext, your class can implement ServletContextAware

EDIT: ServletContext is also accessible in the web application container under the bean name servletContext, so you can inject it like any other bean in Spring.