JasperReport学习笔记7-导出成其它格式(pdf,xls,html)

JasperReport还可以导出为其它格式，如PDF，XLS，RTF，HTML，CSV
下面是导出为PDF和XLS文件

Class.forName("com.mysql.jdbc.Driver");
 Connection connection = DriverManager.getConnection("jdbc:mysql://localhost/jasperreportdb","root","root");
try {
//据据jasper文件生成JasperPrint对象
 JasperPrint jasperPrint = JasperFillManager.fillReport("WebRoot//JasperFile//report9.jasper", new HashMap(),connection);
//生成我们的导出类JRPdfExporter 来自JRExporter
 JRPdfExporter jrpdfExporter = new JRPdfExporter();
//设JasperPrint参数
 jrpdfExporter.setParameter(JRExporterParameter.JASPER_PRINT,jasperPrint);
//设置输入的PDF文件放在什么地方
 jrpdfExporter.setParameter(JRExporterParameter.OUTPUT_FILE_NAME, "WebRoot//JasperFile//exporter.pdf");
//输出
 jrpdfExporter.exportReport();

//Excel JExcelApiExporter 来自JRExporter
 JExcelApiExporter xlsExporter = new JExcelApiExporter();
 xlsExporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
 xlsExporter.setParameter(JRExporterParameter.OUTPUT_FILE_NAME,"WebRoot//JasperFile//exporter.xls");
 xlsExporter.exportReport();
 } catch (JRException e) {
 e.printStackTrace();
 }

在WEB上面生成HTML的报表

publicclass HtmlReportServlet extends HttpServlet {

privatestaticfinallong serialVersionUID = 1L;

publicvoid doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
try {
//连结数据库
 Class.forName("com.mysql.jdbc.Driver");
 Connection connection = DriverManager.getConnection("jdbc:mysql://localhost/jasperreportdb","root","root");
//获得Jasper输入流
 InputStream inputStream = getServletConfig().getServletContext().getResourceAsStream("JasperFile//report9.jasper");
//获得JasperPrint对象
 JasperPrint jasperPrint = JasperFillManager.fillReport(inputStream, new HashMap(),connection);
 connection.close();
//设置格式
 response.setContentType("text/html");
//获得输出流 ,这里不能这样response.getOutputStream()
 PrintWriter printWriter = response.getWriter();
//创建JRHtmlExporter对象
 JRHtmlExporter htmlExporter = new JRHtmlExporter();
//把jasperPrint到Session里面(net.sf.jasperreports.j2ee.jasper_print)
 request.getSession().setAttribute(ImageServlet.DEFAULT_JASPER_PRINT_SESSION_ATTRIBUTE, jasperPrint);
//设值jasperPrint
 htmlExporter.setParameter(JRExporterParameter.JASPER_PRINT,jasperPrint);
//设置输出
 htmlExporter.setParameter(JRExporterParameter.OUTPUT_WRITER,printWriter);
//设置图片生成的Servlet(生成图片就用这个ImageServlet,并且要在XML文件里面配置 image?image=这个是Servlet的url-pattern)
 htmlExporter.setParameter(JRHtmlExporterParameter.IMAGES_URI,"image?image=");
//导出
 htmlExporter.exportReport();
 printWriter.close();
 } catch (SQLException e) {
 e.printStackTrace();
 } catch (ClassNotFoundException e) {
 e.printStackTrace();
 } catch (JRException e) {
 e.printStackTrace();
 }
 }

publicvoid doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doGet(request, response);
 }

}

注意：这个因为用到了JasperReport里面的一个Servlet要在web.xml文件里配置好

<servlet>
<servlet-name>HtmlReportServlet</servlet-name>
<servlet-class>com.langhua.JasperReport.Servlet.HtmlReportServlet</servlet-class>
</servlet>
<servlet>
<servlet-name>ImageServlet</servlet-name>
<servlet-class>net.sf.jasperreports.j2ee.servlets.ImageServlet</servlet-class>
</servlet>
<!--url-pattern视你的情况而定，如果图片出不来，你就看他的连结是什么 -->
<servlet-mapping>
<servlet-name>ImageServlet</servlet-name>
<url-pattern>/servlet/image</url-pattern>
</servlet-mapping>