java - 使用 fop 2.3 版本时找不到 FOP 图像

Question

我已将 FOP 版本从 fop 1.1 升级到 fop 2.3 版本，但得到

org.apache.fop.events.LoggingEventListener processEvent Image not found.

以下是为升级而修改的代码片段。使用fop 2.3掌握查看代码

代码:

  TransformerFactory factory = TransformerFactory.newInstance();
  Transformer transformer = factory.newTransformer();

  FOUserAgent foUserAgent = fopFactory.newFOUserAgent();

  //foUserAgent.setURIResolver( this.getURIResolver() );
  transformer.setURIResolver(this.getURIResolver());

  Fop fop = null;
  Source src = new StreamSource(new ByteArrayInputStream(foDoc));

  if (this.getContentType().equals("application/pdf"))
  {
    fop = fopFactory.newFop(MimeConstants.MIME_PDF, foUserAgent, os);
  }
  else if (this.getContentType().equals("application/postscript"))
  {
    fop = fopFactory.newFop(MimeConstants.MIME_POSTSCRIPT, foUserAgent, os);
  }

查看 fop 2.3 的代码

protected static final FopFactory fopFactory = FopFactory.newInstance(new File(".").toURI(), resolver);

XSLT 代码

<fo:external-graphic src = "stylesheets/Anthem_Join_In.bmp"/>

Answer 1

解析器的 API 已更改，并且记录很少。这段代码在 JSF webApp 中适用于我(fop 2.3)。

final ServletContext sc = (ServletContext) FacesContext.getCurrentInstance().getExternalContext().getContext();

// Create ServletContext resource Resolver
ResourceResolver resolver = new ResourceResolver() {
    @Override
    public Resource getResource(URI uri) throws IOException {
        return new Resource(sc.getResourceAsStream(uri.toASCIIString()));
    }

    @Override
    public OutputStream getOutputStream(URI uri) throws IOException {
        URL url = sc.getResource(uri.toASCIIString());
        return url.openConnection().getOutputStream();
    }
};

// Buid the factory
FopFactoryBuilder builder = new FopFactoryBuilder(new URI(sc.getContextPath()), resolver);
FopFactory FOP_FACTORY = builder.build();

我的项目中之前的其余代码保持不变。我没有使用 Transformer.setURIResolver(...)

xml fop 代码如下所示:

<fo:external-graphic width="auto" content-width="164pt" height="auto" src="url(/resources/img/main-logo.png)"/>