使用Apache FOP Java库将FO转换为PDF / a

Question

我正在尝试使用文档中给出的示例代码将.fo文件转换为PDF
/ a 。我设法将文件转换为PDF，但是当我尝试将其转换为PDF /文件时，出现此错误：Apache FOP 2.1helloworld.fo

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

这就是为什么我尝试在fop.xconf文件中嵌入字体的原因： ``

  <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>

但是即使这样做，我仍然有相同的错误： org.apache.fop.pdf.PDFConformanceException: For PDF/A-1a, all fonts, even the base 14 fonts, have to be embedded! Offending font: /Helvetica

我还试图修改helloworld.fo加入font-family="Helvetica" font-weight="normal" font- style="normal"的<fo:root">，因为一些论坛主题说，这样做，但它并没有改变任何东西。

请帮助我解决嵌入字体错误。感谢您阅读本主题。

[编辑]：这是整个错误消息：

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

进行一些更改后，我能够使用相同的示例文件创建PDF / A输出：

1. 在 输入FO文件中 ，我font-family="Helvetica"在影响所有文本的位置显式添加了（或您最喜欢的字体系列）

如果没有此设置，即使FOP在未font-family设置no时默认使用Helvetica ，显然也无法为其找到配置。

1. 在 配置文件中 ，我将Helvetica字体系列映射到了现有字体，例如Arial

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

1. 在 Java代码中 ，我将FOP配置为使用配置文件，并通过用户代理启用了可访问性

        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");
    ...