jasper ireport生成图片的例子

需要在你的web.xml中配置image生成器

Java代码  

1. <servlet>  
2.     <servlet-name>ImageServlet</servlet-name>  
3.     <servlet-class>  
4.         net.sf.jasperreports.j2ee.servlets.ImageServlet  
5.     </servlet-class>  
6. </servlet>  
7. <servlet-mapping>  
8.     <servlet-name>ImageServlet</servlet-name>  
9.     <url-pattern>/image</url-pattern>  
10. </servlet-mapping>  

然后你的Export中设置如下：

Java代码  

1. public void export(HttpServletRequest request,  
2.         HttpServletResponse response, String reportFilePath, Map params,  
3.         JRDataSource dataSource) {  
4.     try {  
5.         PrintWriter out = response.getWriter();  
6.         try {  
7.             response.setContentType("text/html;charset=UTF-8");  
8.             JasperPrint jasperPrint = new JasperPrintWithDataSource(  
9.                     reportFilePath, params, dataSource).getJasperPrint();  
10.             // 使用JRHtmlExproter导出Html格式  
11.             JRHtmlExporter exporter = new JRHtmlExporter();  
12.             request.getSession().setAttribute(  
13.                     ImageServlet.DEFAULT_JASPER_PRINT_SESSION_ATTRIBUTE,  
14.                     jasperPrint);  
15.             exporter.setParameter(JRExporterParameter.JASPER_PRINT,  
16.                     jasperPrint);  
17.             exporter.setParameter(JRExporterParameter.OUTPUT_WRITER, out);  
18.             exporter.setParameter(JRHtmlExporterParameter.IMAGES_URI,  
19.                     [color=red]"./image?image="[/color]);  
20.             exporter.setParameter(JRExporterParameter.CHARACTER_ENCODING,  
21.                     "UTF-8");  
22.             exporter.setParameter(  
23.                     JRHtmlExporterParameter.BETWEEN_PAGES_HTML, "");  
24.             exporter  
25.                     .setParameter(  
26.                             JRHtmlExporterParameter.IS_REMOVE_EMPTY_SPACE_BETWEEN_ROWS,  
27.                             Boolean.TRUE);  
28.   
29.             // 导出  
30.             exporter.exportReport();  
31.         } catch (Exception e) {  
32.             e.printStackTrace();  
33.         } finally {  
34.             if (out != null) {  
35.                 try {  
36.                     out.close();  
37.                 } catch (Exception e) {  
38.                 }  
39.             }  
40.         }  
41.     } catch (IOException ioe) {  
42.         ioe.printStackTrace();  
43.     }  
44. }