下载成zip压缩包

private static final String EXCEL_TEMPLATE_PATH = "/WEB-INF/SeikyuuTemplate.xls";

private byte[] templateByteArray;

 public void downloadZip(HttpServletResponse response,
   HttpServletRequest request, String seikyuu_ym) {

  List seikyuuymList = this.getSeikyuuymTorihikiList(seikyuu_ym);

  String dateOut = getDate();
  String zipName = "請求書一括" + dateOut + ".zip";

  response.reset();

  try {
   String filePath = getTemplateFilePath(request);
   byte[] cachedByteArray = getTemplateByteArray(filePath);

   zipName = new String(zipName.getBytes("MS932"), "8859_1");
   response.setHeader("Content-Disposition", "attachment; filename="
     + zipName);

   ServletOutputStream outputStream = response.getOutputStream();
   BufferedOutputStream bros = new BufferedOutputStream(outputStream);
   ZipOutputStream objZos = new ZipOutputStream(bros);
   objZos.setEncoding("MS932");

   int i = 0;
   for (Iterator iter = seikyuuymList.iterator(); iter.hasNext();) {
    i++;

    SeikyuuBean objSeikyuu = (SeikyuuBean) iter.next();
    Integer seikyuu_id = objSeikyuu.getSeikyuu_id();
    Integer torihiki_nm_id = objSeikyuu.getTorihiki_nm_id();

    // get seikyuu msg
    SeikyuuBean seikyuuTorihiki = this
      .getSeikyuuTorihikiMsg(seikyuu_id);

    // get seikyuu detail list
    List seikyuuDetaillist = this.getSeikyuuCustomList(
      torihiki_nm_id, seikyuu_ym);

    ByteArrayOutputStream objBos = new ByteArrayOutputStream();

    ByteArrayInputStream templateIn = new ByteArrayInputStream(
      cachedByteArray);

    HSSFWorkbook workbook = new HSSFWorkbook(templateIn);

    this.getExcelGenerator().excelGenerator(workbook,
      seikyuuDetaillist, seikyuuTorihiki);

    workbook.write(objBos);

    String xlsName = seikyuuTorihiki.getTorihiki_nm_kanji() + "_"
      + dateOut + "_" + i + ".xls";
    xlsName = getResetFileName(xlsName);
    ZipEntry objZe = new ZipEntry(xlsName);

    objZe.setMethod(ZipOutputStream.DEFLATED);
    objZos.putNextEntry(objZe);

    byte[] aryByt = objBos.toByteArray();

    objZos.write(aryByt, 0, aryByt.length);

    objBos.close();
   }

   objZos.closeEntry();
   objZos.close();
   bros.close();
   outputStream.close();
  } catch (IOException ioe) {
   log.error("ExcelFile書き出し中にIOExeptionが発生しました。", ioe);
   throw new RuntimeException("失敗しました。", ioe);
  }
 }

 String getTemplateFilePath(HttpServletRequest request) {
  return request.getSession().getServletContext().getRealPath(
    EXCEL_TEMPLATE_PATH);
 }

 synchronized byte[] getTemplateByteArray(String filePath) {
  if (templateByteArray == null) {
   FileInputStream fin = null;
   BufferedInputStream bin = null;
   try {
    fin = new FileInputStream(filePath);
    bin = new BufferedInputStream(fin);
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    int b = -1;
    while ((b = bin.read()) > -1) {
     baos.write(b);
    }
    baos.close();
    templateByteArray = baos.toByteArray();
    log.debug("templateByteArray.length = "
      + templateByteArray.length);
   } catch (FileNotFoundException e) {
    throw new RuntimeException("TemplateFileが存在しません。"
      + e.getMessage(), e);
   } catch (IOException e) {
    throw new RuntimeException("TemplateFileの読み込みに失敗しました。"
      + e.getMessage(), e);
   } finally {
    if (bin != null) {
     try {
      bin.close();
     } catch (IOException e) {
      throw new RuntimeException(
        "TemplateFileの読み込み時にStreamのCloseに失敗しました。"
          + e.getMessage(), e);
     }
    }
   }
  }
  return templateByteArray;
 }