本文介绍了Apache FOP 1.1 QR码与zxing的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
好吧我在使用条形码4j-2.1和zxing-0.1.2在FOP 1.1中生成QR码时遇到问题。我目前正在通过将< prefer-renderer> true< / prefer-renderer> 添加到fop配置文件中，使FOP 1.0实现正常工作。
OK I am having an issue producing QR Codes in FOP 1.1 using barcode4j-2.1 and zxing-0.1.2. I currently have a FOP 1.0 implementation working correctly, by adding <prefer-renderer>true</prefer-renderer> to the fop configuration file.
barcode4j条形码正常工作，无论是否设置了渲染器，在barcode4j-2.1中修复。
barcode4j barcodes are working regardless if prefer renderer is set or not, fixed in barcode4j-2.1.
我有所有必要的依赖：
- fop-zxing-0.1.2-jar-with-dependencies.jar
- barcode4j-fop -ext-complete.jar
- saxon9he.jar - 用于xslt 2.0
...
这里是条形码片段：
<fo:block>
<fo:instream-foreign-object>
<qr:qr-code xmlns:qr="http://hobbut.ru/fop/qr-code/"
width="5cm"
message="TEST DATA"
correction="m"
encoding="UTF-8">
</qr:qr-code>
</fo:instream-foreign-object>
</fo:block>
当尝试转换prefer-renderer似乎没有效果时，我收到错误：
When trying to convert prefer-renderer seems to have no effect, I am receiving the error:
SEVERE: Image not available. URI: (instream-object). Reason: org.apache.xmlgraphics.image.loader.ImageException: The file format is not supported. No ImagePreloader found for null (No context info available)
org.apache.xmlgraphics.image.loader.ImageException: The file format is not supported. No ImagePreloader found for null
at org.apache.xmlgraphics.image.loader.ImageManager.preloadImage(ImageManager.java:180)
at org.apache.fop.render.intermediate.AbstractIFPainter.drawImageUsingDocument(AbstractIFPainter.java:296)
at org.apache.fop.render.pdf.PDFPainter.drawImage(PDFPainter.java:203)
at org.apache.fop.render.intermediate.IFRenderer.renderForeignObject(IFRenderer.java:1290)
at org.apache.fop.render.AbstractRenderer.renderInlineViewport(AbstractRenderer.java:820)
at org.apache.fop.render.AbstractPathOrientedRenderer.renderInlineViewport(AbstractPathOrientedRenderer.java:785)
at org.apache.fop.render.intermediate.IFRenderer.renderInlineViewport(IFRenderer.java:866)
at org.apache.fop.render.AbstractRenderer.renderInlineArea(AbstractRenderer.java:678)
at org.apache.fop.render.intermediate.IFRenderer.renderInlineArea(IFRenderer.java:913)
at org.apache.fop.render.AbstractRenderer.renderLineArea(AbstractRenderer.java:643)
at org.apache.fop.render.AbstractRenderer.renderBlocks(AbstractRenderer.java:561)
at org.apache.fop.render.AbstractRenderer.renderBlock(AbstractRenderer.java:598)
at org.apache.fop.render.intermediate.IFRenderer.renderBlock(IFRenderer.java:980)
at org.apache.fop.render.AbstractRenderer.renderBlocks(AbstractRenderer.java:546)
at org.apache.fop.render.AbstractRenderer.renderFlow(AbstractRenderer.java:451)
at org.apache.fop.render.AbstractPathOrientedRenderer.renderFlow(AbstractPathOrientedRenderer.java:738)
at org.apache.fop.render.AbstractRenderer.renderMainReference(AbstractRenderer.java:428)
at org.apache.fop.render.AbstractRenderer.renderBodyRegion(AbstractRenderer.java:352)
at org.apache.fop.render.AbstractRenderer.renderRegionViewport(AbstractRenderer.java:299)
at org.apache.fop.render.intermediate.IFRenderer.renderRegionViewport(IFRenderer.java:748)
at org.apache.fop.render.AbstractRenderer.renderPageAreas(AbstractRenderer.java:273)
at org.apache.fop.render.AbstractRenderer.renderPage(AbstractRenderer.java:238)
at org.apache.fop.render.intermediate.IFRenderer.renderPage(IFRenderer.java:597)
at org.apache.fop.area.RenderPagesModel.renderPage(RenderPagesModel.java:193)
at org.apache.fop.area.RenderPagesModel.checkPreparedPages(RenderPagesModel.java:174)
at org.apache.fop.area.RenderPagesModel.addPage(RenderPagesModel.java:146)
at org.apache.fop.layoutmgr.AbstractPageSequenceLayoutManager.finishPage(AbstractPageSequenceLayoutManager.java:312)
at org.apache.fop.layoutmgr.PageSequenceLayoutManager.finishPage(PageSequenceLayoutManager.java:191)
at org.apache.fop.layoutmgr.PageSequenceLayoutManager.activateLayout(PageSequenceLayoutManager.java:115)
at org.apache.fop.area.AreaTreeHandler.endPageSequence(AreaTreeHandler.java:267)
at org.apache.fop.fo.pagination.PageSequence.endOfNode(PageSequence.java:128)
at org.apache.fop.fo.FOTreeBuilder$MainFOHandler.endElement(FOTreeBuilder.java:347)
at org.apache.fop.fo.FOTreeBuilder.endElement(FOTreeBuilder.java:181)
at net.sf.saxon.event.ContentHandlerProxy.endElement(ContentHandlerProxy.java:395)
at net.sf.saxon.event.NamespaceReducer.endElement(NamespaceReducer.java:208)
at net.sf.saxon.event.ComplexContentOutputter.endElement(ComplexContentOutputter.java:459)
at net.sf.saxon.expr.instruct.ElementCreator.processLeavingTail(ElementCreator.java:304)
at net.sf.saxon.expr.instruct.ElementCreator.processLeavingTail(ElementCreator.java:254)
at net.sf.saxon.expr.instruct.Block.processLeavingTail(Block.java:615)
at net.sf.saxon.expr.instruct.Instruction.process(Instruction.java:131)
at net.sf.saxon.expr.instruct.ElementCreator.processLeavingTail(ElementCreator.java:301)
at net.sf.saxon.expr.instruct.ElementCreator.processLeavingTail(ElementCreator.java:254)
at net.sf.saxon.expr.instruct.Template.applyLeavingTail(Template.java:212)
at net.sf.saxon.trans.Mode.applyTemplates(Mode.java:1034)
at net.sf.saxon.Controller.transformDocument(Controller.java:1959)
at net.sf.saxon.Controller.transform(Controller.java:1805)
at cwc.fop.util.templates.FOPConvert.translate(FOPConvert.java:116)
at cwc.fop.util.conversion.XML2PDF.translate(XML2PDF.java:151)
at cwc.fop.util.conversion.XML2PDF.translate(XML2PDF.java:114)
at cwc.fop.util.conversion.XML2PDF.translate(XML2PDF.java:65)
at cwc.fop.server.work.WorkerRunnable.run(WorkerRunnable.java:144)
at cwc.util.threading.WorkQueue$PoolWorker.run(WorkQueue.java:59)
提前感谢您的任何帮助
推荐答案
你'重新使用xmlns：qr =http://hobbut.ru/fop/qr-code/与Ba无关rcode4J。看起来你计划使用其他一些FOP插件而不是Barcode4J，但你最终将Barcode4J放在了类路径而不是正确的插件中。 BTW，Barcode4J在其CVS存储库的HEAD分支中集成了ZXing用于QR码生成。
You're using xmlns:qr="http://hobbut.ru/fop/qr-code/" which has nothing to do with Barcode4J. Seems like you planned to use some other FOP plug-in than Barcode4J but you ultimately placed Barcode4J in the classpath instead of the right plug-in. BTW, Barcode4J has an integration of ZXing for QR Code production in the HEAD branch of its CVS repository.
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