JRHtmlExporter 现已弃用。如何定义图片保存路径？

The JRHtml导出器类现在已弃用（JasperReports 6.x).

我将这个类的用法替换为Html导出器。但我找不到等效的函数来替换exporter.setParameter (JRHtmlExporterParameter.IMAGES_URI, imageURI);。我需要设置用于存储生成报告的图像的路径（html file).

我的旧代码：

JRHtmlExporter exporter = new JRHtmlExporter();

exporter.setParameter(JRExporterParameter.JASPER_PRINT, filedReport);
exporter.setParameter(JRExporterParameter.OUTPUT_FILE_NAME, outputFileName);
exporter.setParameter(JRHtmlExporterParameter.BETWEEN_PAGES_HTML, "");
exporter.setParameter(JRHtmlExporterParameter.IS_REMOVE_EMPTY_SPACE_BETWEEN_ROWS, Boolean.TRUE);            
exporter.setParameter(JRHtmlExporterParameter.IS_USING_IMAGES_TO_ALIGN, Boolean.TRUE);

String imageURI = "q?srvAction=ReportImage&img="+returnFileName.substring(3).replace("/", "%2F")+"_files"+"%2F";
exporter.setParameter(JRHtmlExporterParameter.IMAGES_URI,imageURI);

实际的代码是什么JasperReports 6.x用于定义图像路径？

正如我们从 javadoc 中看到的JRHtmlExporterParameter.IMAGES_URI http://jasperreports.sourceforge.net/api/net/sf/jasperreports/engine/export/JRHtmlExporterParameter.html#IMAGES_URI参数确实已被弃用，并且HtmlExporterOutput.getImageHandler() http://jasperreports.sourceforge.net/api/net/sf/jasperreports/export/HtmlExporterOutput.html#getImageHandler()应该使用方法来代替它。

定义图片存储路径

我们可以使用的实现Html 资源处理程序 http://jasperreports.sourceforge.net/api/net/sf/jasperreports/engine/export/HtmlResourceHandler.html接口，例如WebHtml资源处理程序 http://jasperreports.sourceforge.net/api/net/sf/jasperreports/web/util/WebHtmlResourceHandler.html.

使用示例：

JRExporter exporter = new HtmlExporter();

exporter.setExporterInput(new SimpleExporterInput(jasperPrint));
SimpleHtmlExporterOutput output = new SimpleHtmlExporterOutput(out);
output.setImageHandler(new WebHtmlResourceHandler("/reports/image?image={0}"));
exporter.setExporterOutput(output);

exporter.exportReport();

定义导出期间保存图像的位置

在...的帮助下文件 Html 资源处理程序 http://jasperreports.sourceforge.net/api/net/sf/jasperreports/engine/export/FileHtmlResourceHandler.html处理程序我们可以设置生成图像的路径html

使用示例：

JRExporter exporter = new HtmlExporter();
// output file for generated html report
File file = new File(String.format("./out/%1$s_%2$s.html", report.getTemplateName(), new SimpleDateFormat("yyyyMMddHHmmss").format(new Date())));

ExporterConfiguration configuration = new SimpleHtmlExporterConfiguration();
exporter.setConfiguration(configuration);

exporter.setExporterInput(new SimpleExporterInput(jasperPrint));
SimpleHtmlExporterOutput exporterOutput = new SimpleHtmlExporterOutput(file);
// the folder for storing images. It will be subfolder with name starting like generated html and ended with postfix "_images"
File resourcesDir = new File(file.getParent(), file.getName() + "_images");
// argument ({0}) will be replaced with the real image name
String pathPattern = resourcesDir.getName() + "/{0}";

exporterOutput.setImageHandler(new FileHtmlResourceHandler(resourcesDir, pathPattern));
exporter.setExporterOutput(exporterOutput);
exporter.exportReport();

生成的文件和文件夹将是这样的：

 ..                                         [Folder]
    image-test_20170504232649.html          [File]
    image-test_20170504232649.html_images   [Folder]
        img_0_0_0.png                       [File]

Notes:

使用样本Html 资源处理程序可以被找寻到here http://jasperreports.sourceforge.net/sample.reference/webapp/index.html#webapp