public static void read(File file) throws IOException, InvalidFormatException {
    Workbook workbook = WorkbookFactory.create(file);
    Sheet sheet = workbook.getSheetAt(0);
    //セルの中身を読み取る処理
    workbook.close();
}

$ cmp -b sample-after.xlsx sample4-before.xlsx
sample-after.xlsx sample4-before.xlsx differ: byte 7, line 1 is  12 ^J   6 ^F

static Workbook create(java.io.File file, java.lang.String password, boolean readOnly)

@param readOnly If the Workbook should be opened in read-only mode to avoid writing back
      changes when the document is closed.

Workbook workbook = WorkbookFactory.create(file, null, true);