excel多文件压缩导出问题 导出多个不认识文件

excel多文件压缩导出问题 目前只导出了一个 但打开压缩包是这些东西 这是什么原因

public void exportTransactionExcel(HttpServletResponse res,Long id)throws Exception{
        OutputStream out = res.getOutputStream();
        ZipOutputStream zipOutputStream = new ZipOutputStream(out);
        try {
            res.setContentType("application/octet-stream; charset=utf-8");
            res.setHeader("Content-Disposition", "attachment; filename=" + Encodes.urlEncode("xxx.zip"));
            List<List<String>> data = new ArrayList<List<String>>();
            ExportExcelUtils eeu = new ExportExcelUtils();
            File file=new File("C:/Users/MXG/Desktop/xxx.xlsx");
            FileInputStream fis=new FileInputStream(file);
            //Workbook workbook = new XSSFWorkbook(OPCPackage.open(fis));
            XLSTransformer transformer = new XLSTransformer();
            Map<Object, Object> beans=new HashMap<>();
           // Workbook workbook = transformer.transformXLS(new FileInputStream(file), beans);
            Query  query =em.createQuery("From Transaction where 1=1"+((id!=null&&id>0)?" and id="+id:"") );
            List<Transaction> transactionList =query.getResultList();
            int j=0;
            for (Transaction transaction : transactionList) {
                Workbook workbook = new XSSFWorkbook(OPCPackage.open(fis));
                 // HSSFSheet mySheet = workbook.createSheet();
                  Sheet mySheet = workbook.getSheetAt(0);
                  //创建第一行，标题行
                  int rowNomber=-1;
                  Row row= mySheet.getRow(2);
                  Cell cell=row.getCell(3);
                  cell.setCellValue("123456");

                //重点开始,创建压缩文件
                ZipEntry z = new ZipEntry(transaction.getServiceName()+j+++ ".xlsx");
                zipOutputStream.putNextEntry(z);
              //写入一个压缩文件
                workbook.write(zipOutputStream);
            }
            zipOutputStream.flush();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            //注意关闭顺序，否则可能文件错误
            if (zipOutputStream != null) {
                zipOutputStream.close();
            }
            if (out != null) {
                out.close();
            }
        }
    }

excel本来就是一个压缩文件