加载XSLT文件时解析相对路径 [英] Resolving relative paths when loading XSLT files

问题描述

我需要使用Apache FOP进行XSL转换，我的代码如下：

I need to do an XSL transformation using Apache FOP and I had code like this:

//Setup FOP
Fop fop = fopFactory.newFop(MimeConstants.MIME_PDF, out);
//Setup Transformer
Source xsltSrc = new StreamSource(new File(xslPath));
Transformer transformer = tFactory.newTransformer(xsltSrc);

//Make sure the XSL transformation's result is piped through to FOP
Result res = new SAXResult(fop.getDefaultHandler());
//Setup input
Source src = new StreamSource(new File(xmlPath));
//Start the transformation and rendering process
transformer.transform(src, res);

其中 xslPath 是我的XSLT的路径文件存储。

where xslPath is the path where my XSLT file is stored.

我已经确认它只有一个XSLT文件时可以工作，但是在我的项目中，我将事物分成了几个XSLT文件并加入了它们< xsl：import /> 代码。使用这种配置，我得到一个NullPointerException，因为它不能理解存储在XSLT中的所有信息，因为它分布在不同的文件中。

I have confirmed that it works when I have only one XSLT file, but in my project I have divided things into several XSLT files and joined them with the <xsl:import /> tag. With this configuration, I get a NullPointerException because it doesn't understand all the information stored in XSLT because it's distributed over different files.

我想知道是否有任何方法可以加载 Source xsltSrc 变量中的所有这些文件，以便所有XSL信息都可用。

I wonder if there's any way to load all these files in the Source xsltSrc variable so all the XSL information is available.

UPDATE

我根据Mads Hansen给出的答案更改了代码，但它仍然无效。我必须在类路径中包含XSLT slt文件，因此我使用ClassLoader加载XSLT文件。我在执行 url.toExternalForm（）时检查了URL是否具有正确的路径。这是我的新代码：

I've changed the code based on the answer given by Mads Hansen, but it still doesn't work. I have to include the XSLT slt files in the classpath, so I load the XSLT file with ClassLoader. I've checked that the URL has the correct path when executing url.toExternalForm(). This is my new piece of code:

ClassLoader cl = this.getClass().getClassLoader();
String systemID = "resources/xslt/myfile.xslt";
InputStream in = cl.getResourceAsStream(systemID);
URL url = cl.getResource(systemID);
Source source = new StreamSource(in);
source.setSystemId(url.toExternalForm());
transformer = tFactory.newTransformer(source);

它找到并加载 myfile.xslt 但是它仍然无法解析其他XSLT文件的相对路径。

It finds and loads myfile.xslt but it still doesn't resolve the relative paths to the other XSLT files.

我做错了什么？

推荐答案

我刚刚得到它，一个迟到的答案（在FOP 1.0测试）------

I just got it, a late answer(tested on FOP 1.0) ------

你需要的只是为你的工厂设置一个uri解析器，因为以下对我有效：

All you need is to set an uri resolver for your factory, as following works for me:

TransformerFactory transFact = TransformerFactory.newInstance();
StreamSource xsltSource = new StreamSource(xsl);

// XXX for 'xsl:import' to load other xsls from class path
transFact.setURIResolver(new ClasspathResourceURIResolver());
Templates cachedXSLT = transFact.newTemplates(xsltSource);
Transformer transformer = cachedXSLT.newTransformer();


class ClasspathResourceURIResolver implements URIResolver {
  @Override
  public Source resolve(String href, String base) throws TransformerException {
    return new StreamSource(XXX.getClassLoader().getResourceAsStream(href));
  }
}

和我的导入xsl（所以'imported.xsl '应该在类路径中）：

and my importing xsl(so the 'imported.xsl' should be in the classpath):

<xsl:import href="META-INF/companybusinesscredit/imported.xsl"/>

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