我认为你的问题在于XSLT。请更改：
<xsl:variable name="lookup" select="('documentFile')/> .
为了
<xsl:variable name="lookup" select="document('lookup')/>
这将导致变压器使您文档的
DOM在变量
lookup中可访问。键
lookup来自
docs.put("lookup", documentFile);
通过URIResolver动态传递多个XML源到XSL转换。
完整工作示例：
有三个XML文件：repo.xml，books.xml和articles.xml。 repo.xml包含有关书籍和文章的状态信息。文件articles.xml和books.xml包含每个项目的标题信息。目标是打印所有书籍和文章的状态信息以及标题信息。所有文件中的条目都通过id键连接。
在GitHub上找到完整示例或复制/粘贴下面的列表。
repo.xml
<repository>
<book>
<id>1</id>
<status>available</status>
</book>
<book>
<id>2</id>
<status>lost</status>
</book>
<article>
<id>1</id>
<status>in transit</status>
</article>
</repository>
books.xml
<books>
<book id="1">
<title>Book One</title>
</book>
<book id="2">
<title>Book Two</title>
</book>
<book id="3">
<title>Book Three</title>
</book>
</books>
articles.xml
<articles>
<article id="1">
<title>Article One</title>
</article>
<article id="2">
<title>Article Two</title>
</article>
<article id="3">
<title>Article Three</title>
</article>
</articles>
join.xsl
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" encoding="UTF-8" indent="yes" />
<xsl:template match="/">
<titleStatusJoin>
<xsl:for-each select="//book">
<xsl:variable name="myId" select="id" />
<book>
<status>
<xsl:value-of select="status" />
</status>
<title>
<xsl:for-each select="document('bookFile')//book">
<xsl:variable name="bookId" select="@id" />
<xsl:choose>
<xsl:when test="$myId = $bookId">
<xsl:value-of select="title" />
</xsl:when>
</xsl:choose>
</xsl:for-each>
</title>
</book>
</xsl:for-each>
<xsl:for-each select="//article">
<xsl:variable name="myId" select="id" />
<article>
<status>
<xsl:value-of select="status" />
</status>
<title>
<xsl:for-each select="document('articleFile')//article">
<xsl:variable name="bookId" select="@id" />
<xsl:choose>
<xsl:when test="$myId = $bookId">
<xsl:value-of select="title" />
</xsl:when>
</xsl:choose>
</xsl:for-each>
</title>
</article>
</xsl:for-each>
</titleStatusJoin>
</xsl:template>
</xsl:stylesheet>
请使用以下Java代码...
@Test
public void useMultipleXmlSourcesInOneXsl3() {
InputStream xml = Thread.currentThread().getContextClassLoader().getResourceAsStream("stack54335576/repo.xml");
InputStream xsl = Thread.currentThread().getContextClassLoader().getResourceAsStream("stack54335576/join3.xsl");
InputStream booksXml = Thread.currentThread().getContextClassLoader()
.getResourceAsStream("stack54335576/books.xml");
InputStream articlesXml = Thread.currentThread().getContextClassLoader()
.getResourceAsStream("stack54335576/articles.xml");
Document booksDom = readXml(booksXml);
Document articlesDom = readXml(articlesXml);
Map<String, Document> parameters = new HashMap<>();
parameters.put("bookFile", booksDom);
parameters.put("articleFile", articlesDom);
xslt(xml, xsl, parameters);
}
public final void xslt(InputStream xml, InputStream xsl, Map<String, Document> parameters) {
try {
TransformerFactory factory = TransformerFactory.newInstance();
Transformer transformer = factory.newTransformer(new StreamSource(xsl));
transformer.setURIResolver((href, base) -> new DOMSource(parameters.get(href)));
transformer.transform(new StreamSource(xml), new StreamResult(System.out));
} catch (Exception e) {
throw new RuntimeException(e);
}
}
private Document readXml(InputStream xmlin) {
try {
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
dbf.setNamespaceAware(true);
DocumentBuilder db = dbf.newDocumentBuilder();
return db.parse(xmlin);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
…生成此输出
<?xml version="1.0" encoding="UTF-8"?>
<titleStatusJoin>
<book>
<status>available</status>
<title>Book One</title>
</book>
<book>
<status>lost</status>
<title>Book Two</title>
</book>
<article>
<status>in transit</status>
<title>Article One</title>
</article>
</titleStatusJoin>
java.xml.tansform，你会使用哪个XSLT处理器？你是否知道自从1.0版本以来，XSLT就拥有了强大的“document”函数，它允许直接从XSLT中加载/访问其他XML文档，甚至可以一次性加载多个文档？ - Martin Honnen