java - 从 servlet 将 Jasperreports 导出到 pptx

Question

如何将 jasperReport 导出到 pptx???

我尝试了这个但不起作用...

servlet 返回一个 pptx 文件，但该文件无法打开

        JasperPrint jasperPrint = JasperFillManager.fillReport(reporte, parametros, new JREmptyDataSource());
        String fileName = "informeDemo.pptx";
        JRPptxExporter exporter = new JRPptxExporter();
        exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
        exporter.setParameter(JRExporterParameter.OUTPUT_FILE_NAME, fileName);
        exporter.exportReport();

        File f = new File(fileName);

        response.setContentType("application/vnd.openxmlformats-officedocument.presentationml.presentation"); //Tipo de fichero.
        response.setHeader("Content-Disposition", "attachment;filename=\"" + fileName + "\""); //Configurar cabecera http

        InputStream in = new FileInputStream(f);
        out = response.getOutputStream();

        int bit = 256;
        while ((bit) >= 0) {
            bit = in.read();
            out.write(bit);
        }

        out.flush();
        out.close();
        in.close();

Answer 1

这里按照以下方式进行:

                JasperPrint jasperPrint = JasperFillManager.fillReport(reporte, parametros, new JREmptyDataSource());
                String fileName = "informeDemo.pptx";
                JRPptxExporter exporter = new JRPptxExporter();
                exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
                exporter.setParameter(JRExporterParameter.OUTPUT_FILE_NAME, fileName);
                ByteOutputStream bos=new ByteOutputStream();  // note bos will contain jasperPrint as byte data
                exporter.setParameter(JRExporterParameter.OUTPUT_STREAM,bos);
                exporter.exportReport();

                response.setContentType("application/vnd.openxmlformats-officedocument.presentationml.presentation"); //Tipo de fichero.
                response.setHeader("Content-Disposition", "attachment;filename=\"" + fileName + "\""); //Configurar cabecera http
                response.setCharacterEncoding("UTF-8");
                response.getOutputStream().write(bos.getBytes()); //note bos is written to response's output stream.
                bos.flush();
                bos.close();
                response.flushBuffer();

希望这对您有帮助。