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/**
     * get mine type of file
     *
     * @param path
     * @return mine type for upload file
     */
    public static String getMimeType(String path, String useThisIfNull) {
        String type = useThisIfNull;
        String extension = null;
        int i = path.lastIndexOf('.');
        if (i > 0) {
            extension = path.substring(i+1);
        }
        if (extension != null || extension == "") {
            MimeTypeMap mime = MimeTypeMap.getSingleton();
            type = mime.getMimeTypeFromExtension(extension);
        }
        return type;
    }