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

public class HtmlReportServlet extends HttpServlet {

	private static final long serialVersionUID = 1L;

	public void 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();
		}
	}

	public void 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>