jsp页面嵌入ireport报表
以下方法生成报表数据(reportContent)，也就是html中table代码，我们可以在servlet中调用以下方法生成报表数据，存到request域中，转发到jsp页面，显示报表数据。另外这个方法将jasperPrint对象存到了session中，这样导出Excel、Pdf时可以拿到这个对象，调用导出相关方法进行操作。
private String generateReport(Map<String, Object> parameters, File reportFile, Connection connection, JRDataSource dataSource) {try {StringBuffer reportContent = new StringBuffer();JasperReport jasperReport = (JasperReport) JRLoader.loadObject(reportFile.getPath());JasperPrint jasperPrint = null;if (connection != null) {jasperPrint = JasperFillManager.fillReport(jasperReport, parameters, connection);} else {jasperPrint = JasperFillManager.fillReport(jasperReport, parameters, dataSource);}request.getSession().setAttribute("jasperPrint", jasperPrint);JRHtmlExporter exporter = new JRHtmlExporter();exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);exporter.setParameter(JRExporterParameter.OUTPUT_STRING_BUFFER, reportContent);exporter.setParameter(JRXlsExporterParameter.IS_IGNORE_CELL_BORDER, Boolean.TRUE);exporter.setParameter(JRHtmlExporterParameter.IS_USING_IMAGES_TO_ALIGN, Boolean.FALSE);exporter.setParameter(JRHtmlExporterParameter.CHARACTER_ENCODING, "utf-8");exporter.setParameter(JRHtmlExporterParameter.HTML_HEADER, "");exporter.setParameter(JRHtmlExporterParameter.BETWEEN_PAGES_HTML, "");exporter.setParameter(JRHtmlExporterParameter.HTML_FOOTER, "");exporter.exportReport();return reportContent;} catch(Exception e) {throw new RuntimeException(e);} finally {if (connection != null) {DBManager.relaseConnection(connection, null, null);}}}