使用 Java 执行调用 Java 函数的 XSLT

Question

我是 XSLT 的新手。以前，我习惯于使用命令行来执行 XSLT。就像这样：

@echo off
set XALAN_JAR=%OPENCCG_HOME%\lib\xalan.jar
java -classpath .;%XALAN_JAR% org.apache.xalan.xslt.Process -IN recommend_person.xml -XSL planner.xsl -OUT people_graph.xml

这很有效，我能够在 planner.xsl 文件中调用 Java 函数。但是现在我想在 Java 程序中做同样的事情，我写了这样的程序：

/**
 * Created by Zhao on 2016/8/19.
 */
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.stream.*;
import java.io.FileOutputStream;

public class xslTest {
    // 1. Instantiate a TransformerFactory.
    private TransformerFactory tFactory;

    // 2. Use the TransformerFactory to process the stylesheet Source and
    //    generate a Transformer.
    private Transformer transformer;

    private FileOutputStream outStream;
    // setup the input, output and xsl
    private StreamSource xsl;
    private StreamSource input;
    private StreamResult output;

    public void xslTest(String inputFile, String outputFile, String XSLFile) {

        try {
            tFactory = TransformerFactory.newInstance();

            xsl = new StreamSource(XSLFile);
            input = new StreamSource(inputFile);

            outStream = new FileOutputStream(outputFile);
            output = new StreamResult(outStream);

            transformer = tFactory.newTransformer(xsl);

            transformer.transform(input, output);

        }catch (Exception e) {
            e.printStackTrace();
        }
        System.out.printf(
                "Transform from %s to %s using %s performed",
                inputFile, outputFile, XSLFile
        );
    }
    public static void main (String[] args) {
        xslTest test = new xslTest();

        String inputFile = "C:/xslt/recommend_person.xml";
        String outputFile = "C:/xslt/output.xml";
        String XSLFile = "C:/xslt/planner.xsl";

        test.xslTest(inputFile, outputFile, XSLFile);
    }
}

我的 IDE 告诉我有很多错误，例如：

file:///C:/xslt/planner.xsl; Line #16; Column #60; javax.xml.transform.TransformerException: java.lang.ClassNotFoundException: NodeIdGen
file:///C:/xslt/planner.xsl; Line #20; Column #55; Unknown error in XPath.
file:///C:/xslt/planner.xsl; Line #23; Column #65; Variable idgen is directly or indirectly referencing itself!
Transform from C:/xslt/recommend_person.xml to C:/xslt/output.xml using C:/xslt/planner.xsl performed
file:///C:/xslt/planner.xsl; Line #16; Column #60; javax.xml.transform.TransformerException: java.lang.ClassNotFoundException: NodeIdGen
file:///C:/xslt/planner.xsl; Line #23; Column #65; Unknown error in XPath.
file:///C:/xslt/planner.xsl; Line #26; Column #82; Variable idgen is directly or indirectly referencing itself!
file:///C:/xslt/planner.xsl; Line #16; Column #60; javax.xml.transform.TransformerException: java.lang.ClassNotFoundException: NodeIdGen
file:///C:/xslt/planner.xsl; Line #26; Column #82; Unknown error in XPath.
file:///C:/xslt/planner.xsl; Line #29; Column #129; Variable idgen is directly or indirectly referencing itself!
file:///C:/xslt/planner.xsl; Line #16; Column #60; javax.xml.transform.TransformerException: java.lang.ClassNotFoundException: NodeIdGen
file:///C:/xslt/planner.xsl; Line #29; Column #129; Unknown error in XPath.
file:///C:/xslt/planner.xsl; Line #33; Column #68; Variable idgen is directly or indirectly referencing itself!
file:///C:/xslt/planner.xsl; Line #16; Column #60; javax.xml.transform.TransformerException: java.lang.ClassNotFoundException: NodeIdGen
file:///C:/xslt/planner.xsl; Line #33; Column #68; Unknown error in XPath.
file:///C:/xslt/planner.xsl; Line #36; Column #72; Variable idgen is directly or indirectly referencing itself!
file:///C:/xslt/planner.xsl; Line #16; Column #60; javax.xml.transform.TransformerException: java.lang.ClassNotFoundException: NodeIdGen
file:///C:/xslt/planner.xsl; Line #36; Column #72; Unknown error in XPath.
file:///C:/xslt/planner.xsl; Line #39; Column #71; Variable idgen is directly or indirectly referencing itself!
file:///C:/xslt/planner.xsl; Line #16; Column #60; javax.xml.transform.TransformerException: java.lang.ClassNotFoundException: NodeIdGen
file:///C:/xslt/planner.xsl; Line #39; Column #71; Unknown error in XPath.
file:///C:/xslt/planner.xsl; Line #51; Column #67; Variable idgen is directly or indirectly referencing itself!
file:///C:/xslt/planner.xsl; Line #16; Column #60; javax.xml.transform.TransformerException: java.lang.ClassNotFoundException: NodeIdGen
file:///C:/xslt/planner.xsl; Line #51; Column #67; Unknown error in XPath.
file:///C:/xslt/planner.xsl; Line #57; Column #60; Variable idgen is directly or indirectly referencing itself!
file:///C:/xslt/planner.xsl; Line #16; Column #60; javax.xml.transform.TransformerException: java.lang.ClassNotFoundException: NodeIdGen
file:///C:/xslt/planner.xsl; Line #57; Column #60; Unknown error in XPath.
file:///C:/xslt/planner.xsl; Line #60; Column #72; Variable idgen is directly or indirectly referencing itself!
file:///C:/xslt/planner.xsl; Line #16; Column #60; javax.xml.transform.TransformerException: java.lang.ClassNotFoundException: NodeIdGen
file:///C:/xslt/planner.xsl; Line #60; Column #72; Unknown error in XPath.
file:///C:/xslt/planner.xsl; Line #65; Column #48; Variable idgen is directly or indirectly referencing itself!
file:///C:/xslt/planner.xsl; Line #16; Column #60; javax.xml.transform.TransformerException: java.lang.ClassNotFoundException: NodeIdGen
file:///C:/xslt/planner.xsl; Line #65; Column #48; Unknown error in XPath.

NodeIdGen 是我在 XSL 文件中使用的 Java class。当我使用命令行进行转换时效果很好。

Answer 1

谢谢大家。问题解决了！这与 XSLT 无关。只是一个 classpath 问题：您需要将 XSL 文件中使用的 class 文件添加到您的项目 classpath.

使用 Java 执行调用 Java 函数的 XSLT

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