FO到PDF/a转换与Apache FOP Java库

Question

我试图将.fo文件转换为PDF/a与Apache FOP 2.1与文档中给出的exemple代码。我设法给helloworld.fo文件转换成PDF，但是，当我试图把它转换成PDF/A文件，我得到这个错误：

org.apache.fop.pdf.PDFConformanceException: For PDF/A-1a, all fonts, even the base 14 fonts, have to be embedded! Offending font: /Helvetica

这就是为什么我在fop.xconf文件试图嵌入字体：

<fonts> 

    <font kerning="yes" embed-url="C:/Users/thinkpad/workspace/FopConverter/Fonts/arial.ttf" name="Arial"> 
     <font-triplet name="Arial" style="normal" weight="700"/> 
    </font> 
    <font kerning="yes" embed-url="C:/Users/thinkpad/workspace/FopConverter/Fonts/arialbd.ttf" name="Arial Bold"> 
     <font-triplet name="Arial" style="normal" weight="bold"/> 
    </font> 
    <font kerning="yes" embed-url="C:/Users/thinkpad/workspace/FopConverter/Fonts/ariali.ttf" name="Arial Italique"> 
     <font-triplet name="Arial" style="italic" weight="700"/> 
    </font> 
    <font kerning="yes" embed-url="C:/Users/thinkpad/workspace/FopConverter/Fonts/arialbi.ttf" name="Helvetica Bold Italique"> 
     <font-triplet name="Arial" style="italic" weight="bold"/> 
    </font> 

    <directory>C:\Users\thinkpad\workspace\FopConverter\Fonts</directory> 
    <directory>C:\Users\thinkpad\workspace\FopConverter\Fonts\ghostFonts</directory> 

    <substitutions> 
    <substitution> 
     <from font-family="Helvetica" font-weight="700..900"/> 
     <to font-family="Arial"/> 
    </substitution> 
    </substitutions> 
    <auto-detect/> 
    </fonts> 

但即使这样做之后，我仍然有同样的错误：org.apache.fop.pdf.PDFConformanceException: For PDF/A-1a, all fonts, even the base 14 fonts, have to be embedded! Offending font: /Helvetica

我也试图通过在加入font-family="Helvetica" font-weight="normal" font-style="normal"修改，因为一些forum topic说这样做，但它没有改变任何东西。

请帮我解决我的嵌入字体错误。感谢您阅读此主题。

[编辑]： 这里是整个错误消息：

FOP ExampleFO2PDF 

Preparing... 
Input: XSL-FO (.\xml\fo\helloworld.fo) 
Output: PDF (.\out\ResultFO2PDF.pdf) 

Transforming... 
août 07, 2017 11:26:49 AM org.apache.fop.events.LoggingEventListener processEvent 
INFOS: Rendered page #1. 
org.apache.fop.pdf.PDFConformanceException: For PDF/A-1b, all fonts, even the base 14 fonts, have to be embedded! Offending font: /Helvetica 
    at org.apache.fop.pdf.PDFFont.validate(PDFFont.java:170) 
    at org.apache.fop.pdf.PDFFont.output(PDFFont.java:179) 
    at org.apache.fop.pdf.PDFDocument.outputIndirectObject(PDFDocument.java:1053) 
    at org.apache.fop.pdf.PDFDocument.streamIndirectObject(PDFDocument.java:1018) 
    at org.apache.fop.pdf.PDFDocument.output(PDFDocument.java:994) 
    at org.apache.fop.pdf.PDFDocument.outputTrailer(PDFDocument.java:1097) 
    at org.apache.fop.render.pdf.PDFDocumentHandler.endDocument(PDFDocumentHandler.java:191) 
    at org.apache.fop.render.intermediate.util.IFDocumentHandlerProxy.endDocument(IFDocumentHandlerProxy.java:187) 
    at org.apache.fop.render.intermediate.IFRenderer.stopRenderer(IFRenderer.java:295) 
    at org.apache.fop.area.RenderPagesModel.endDocument(RenderPagesModel.java:265) 
    at org.apache.fop.area.AreaTreeHandler.endDocument(AreaTreeHandler.java:342) 
    at org.apache.fop.fo.FOTreeBuilder.endDocument(FOTreeBuilder.java:170) 
    at org.apache.xalan.transformer.TransformerIdentityImpl.endDocument(TransformerIdentityImpl.java:963) 
    at org.apache.xerces.parsers.AbstractSAXParser.endDocument(Unknown Source) 
    at org.apache.xerces.impl.XMLDocumentScannerImpl.endEntity(Unknown Source) 
    at org.apache.xerces.impl.XMLEntityManager.endEntity(Unknown Source) 
    at org.apache.xerces.impl.XMLEntityScanner.load(Unknown Source) 
    at org.apache.xerces.impl.XMLEntityScanner.skipSpaces(Unknown Source) 
    at org.apache.xerces.impl.XMLDocumentScannerImpl$TrailingMiscDispatcher.dispatch(Unknown Source) 
    at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source) 
    at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source) 
    at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source) 
    at org.apache.xerces.parsers.XMLParser.parse(Unknown Source) 
    at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source) 
    at org.apache.xalan.transformer.TransformerIdentityImpl.transform(TransformerIdentityImpl.java:485) 
    at ConverterFO2PDFa.convertFO2PDF(ConverterFO2PDFa.java:104) 
    at ConverterFO2PDFa.main(ConverterFO2PDFa.java:154) 

Answer 1

我能够创建一个PDF /使用相同的例子文件一些变化后A输出：

1. 在输入的FO文件中，我明确地添加了font-family="Helvetica"（或您最喜欢的字体系列），它影响了所有文本

   如果没有此设置，即使FOP默认使用Helvetica，但没有设置font-family，它显然无法找到它的配置。

2. 的配置文件在

   ，我绘制了Helvetica字体家族现有的字体，例如Arial字体

   <font kerning="yes" embed-url="/Library/Fonts/arial.ttf"> 
       <font-triplet name="Helvetica" style="normal" weight="normal"/> 
   </font> 
   

3. 在Java代码，我配置FOP使用我的配置文件和用户代理以启用辅助功能

   import org.apache.avalon.framework.configuration.Configuration; 
   import org.apache.avalon.framework.configuration.DefaultConfigurationBuilder; 
   import org.apache.fop.apps.FopFactoryBuilder; 
   
   ... 
   DefaultConfigurationBuilder cfgBuilder = new DefaultConfigurationBuilder(); 
   Configuration cfg = cfgBuilder.buildFromFile(new File("/Users/lfurini/fop.xconf")); 
   FopFactoryBuilder fopFactoryBuilder = new FopFactoryBuilder(new File(".").toURI()).setConfiguration(cfg); 
   FopFactory fopFactory = fopFactoryBuilder.build(); 
   
   FOUserAgent foUserAgent = fopFactory.newFOUserAgent(); 
   // configure foUserAgent as desired 
   foUserAgent.setAccessibility(true); 
   foUserAgent.getRendererOptions().put("pdf-a-mode", "PDF/A-1b"); 
   ...