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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 "";
}
这是我在被用户调用来打印JasperReport的managedBean中的操作方法,但是当我尝试在zip文件中放入多个报表时,它不起作用。如何把两个jasperReports放在一个zip文件中下载?
getPeriodScales返回两个对象,JasperFillManager.fillReport正常运行,因为当我为一个报告生成数据时,报告打印出来,当我尝试流两个报告时,只在WinRar中打开一个报告,而我得到一个“未加密档案末尾“,在7zip中均出现,但第二个已损坏。
我在做什么错了或是否有一种方法来流多个报告而不压缩它?