code: public static long getEntryId(String entryFileName) {
          int ind1 = entryFileName.indexOf("_") + 1;
          if (ind1 > 0) {
              int ind2 = entryFileName.indexOf("_", ind1);
              if (ind2 > ind1) {
                  String str = entryFileName.substring(ind1, ind2);
                  try {
                      return Long.parseLong(str);
                  } catch (Exception e) {
                  }
              }
          }
          
          return 0;
      }
docs: Gets the entry ID based on the specified entry file name.