Jasper报告不显示图像

问题描述：

首先，对我的英语不好，感到抱歉。而我的问题：我尝试在html页面上显示报告预览。为此，设置参数：Jasper报告不显示图像

request.getSession().setAttribute(ImageServlet.DEFAULT_JASPER_PRINT_SESSION_ATTRIBUTE, jasperPrint); 
exporter.setParameter(JRExporterParameter.OUTPUT_FILE_NAME, outFilePath); 
exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint); 
exporter.setParameter(JRHtmlExporterParameter.IS_OUTPUT_IMAGES_TO_DIR, Boolean.TRUE); 
exporter.setParameter(JRHtmlExporterParameter.IMAGES_URI, "/preview/image?image="); 
exporter.exportReport();

可以看出，我们将报告导出到指定目录下的html文件中。在网上，我增加了以下内容：

<servlet> 
    <servlet-name>ImageServlet</servlet-name> 
    <servlet-class>net.sf.jasperreports.j2ee.servlets.ImageServlet</servlet-class> 
</servlet> 
<servlet-mapping> 
    <servlet-name>ImageServlet</servlet-name> 
    <url-pattern>/preview/image</url-pattern> 
</servlet-mapping>

对于显示HTML，我们有FTL控制器：

@RequestMapping(value = "/events/preview", method = RequestMethod.POST) 
public void reportPreviewEvents(String requestInJson, 
           @RequestParam("pageSize") Integer pageSize, 
           @RequestParam("pageNo") Integer pageNo, 
           HttpServletResponse response, 
           HttpServletRequest request, 
           Model model) { 
    try { 
     Map<String, Object> toModel = auditHandler.handleExportEvents(requestInJson, JasperExporter.Type.HTML, pageSize, pageNo, request); 
     model.addAllAttributes(toModel); 
     String filePath = (String) toModel.get("filePath"); 
     reportContent = org.apache.commons.io.IOUtils.toString(new FileInputStream(filePath), Charset.forName("UTF-8")); 
     response.setCharacterEncoding("UTF-8"); 
     response.getWriter().write(reportContent);

但是当我打开它（IP：端口/上下文/报告/事件/预览/），我无法在html中看到图像。在此先感谢！

此外：我发现http://community.jaspersoft.com/questions/531045/image-not-displayed-html-view。最后的评论。我用5.0.4版本 – MacTire

发现错误。它需要上下文的图像uri，如：exporter.setParameter（JRHtmlExporterParameter.IMAGES_URI，ContextLoader.getCurrentWebApplicationContext（）。getServletContext（）。getContextPath（）+“/ preview/image？image =”）; – MacTire

只需从request.getSession（）。getServletContext（）。getRealPath（“/”）获取相关路径 – Harsha

答

这是可以生成一个HTML报告，并点为新的JasperReports库（我用6.1.0）图像的servlet的方式，因为很多老的功能已被弃用：

StringBuffer sbuffer = new StringBuffer();   
HtmlExporter exporterHTML = new HtmlExporter(); 
SimpleExporterInput exporterInput = new SimpleExporterInput(jasperPrint); 
exporterHTML.setExporterInput(exporterInput); 

SimpleHtmlExporterOutput exporterOutput = new SimpleHtmlExporterOutput(sbuffer); 
//pointing to the image servlet 
HtmlResourceHandler imageHandler = new WebHtmlResourceHandler(request.getContextPath() + "/servlets/image?" + ImageServlet.IMAGE_NAME_REQUEST_PARAMETER 
     + "={0}" + "&uuid=" + UUID.randomUUID().toString()); 
exporterOutput.setImageHandler(imageHandler); 

//setting some sonfigs for the report 
SimpleHtmlExporterConfiguration htmlConfig = new SimpleHtmlExporterConfiguration(); 
SimpleHtmlReportConfiguration htmlReportConfiguration = new SimpleHtmlReportConfiguration(); 
htmlConfig.setHtmlFooter(""); 
htmlConfig.setHtmlHeader(""); 
htmlConfig.setBetweenPagesHtml(""); 
htmlReportConfiguration.setPageIndex(pageIndex); 

exporterHTML.setConfiguration(htmlConfig); 
exporterHTML.setExporterOutput(exporterOutput); 
exporterHTML.setConfiguration(htmlReportConfiguration); 

exporterHTML.exportReport();

希望有人认为它有帮助。

Jasper报告不显示图像

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