如何将两个jasperReports放在一个zip文件中下载?

时间:2015-03-13 12:14:36

标签: jsf-2 jasper-reports outputstream zipoutputstream

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managedBean中的action方法,用户调用它来打印JasperReport,但是当我尝试在zip文件中放入多个报表时,它无法正常工作。

getPeriodScales正在返回两个对象,并且JasperFillManager.fillReport正在正确运行,因为当我为一个报告生成数据时打印报告,当我尝试流式传输两个报告并在WinRar中打开时只出现一个,我得到一个&#34 ;存档的未删除结束",在7zip中都出现,但第二个已损坏。

我做错了什么或有没有办法在不压缩的情况下流式传输多个报告?

1 个答案:

答案 0 :(得分:0)

我弄清楚是什么,我设置的响应内容长度为bytes.length,但应该是bytes.length * Scale.getPeriodScales(this.startDate, this.endDate).size()