0
public String generateReport() {
try
{
final FacesContext facesContext = FacesContext.getCurrentInstance();
final HttpServletResponse response = (HttpServletResponse) facesContext.getExternalContext().getResponse();
response.reset();
response.setHeader("Content-Disposition", "attachment; filename=\"" + "myReport.zip\";");
final BufferedOutputStream bos = new BufferedOutputStream(response.getOutputStream());
final ZipOutputStream zos = new ZipOutputStream(bos);
for (final PeriodScale periodScale : Scale.getPeriodScales(this.startDate, this.endDate))
{
final JasperPrint jasperPrint = JasperFillManager.fillReport(
this.reportsPath() + File.separator + "periodicScale.jasper",
this.parameters(this.reportsPath(), periodScale.getScale(),
periodScale.getStartDate(), periodScale.getEndDate()),
new JREmptyDataSource());
final byte[] bytes = JasperExportManager.exportReportToPdf(jasperPrint);
response.setContentLength(bytes.length);
final ZipEntry ze = new ZipEntry("periodicScale"+ periodScale.getStartDate() + ".pdf"); // periodicScale13032015.pdf for example
zos.putNextEntry(ze);
zos.write(bytes, 0, bytes.length);
zos.closeEntry();
}
zos.close();
facesContext.responseComplete();
}
catch (final Exception e)
{
e.printStackTrace();
}
return "";
}
這是我在被用戶調用來打印JasperReport的managedBean中的操作方法,但是當我嘗試在zip文件中放入多個報表時,它不起作用。如何把兩個jasperReports放在一個zip文件中下載?
getPeriodScales返回兩個對象,JasperFillManager.fillReport正常運行,因爲當我爲一個報告生成數據時,報告打印出來,當我嘗試流兩個報告時,只在WinRar中打開一個報告,而我得到一個「未加密檔案末尾「,在7zip中均出現,但第二個已損壞。
我在做什麼錯了或是否有一種方法來流多個報告而不壓縮它?