从 JAR 文件加载 XSLT 文件会加载 JAR 文件本身而不是 XSLT

Question

我在 JAR 文件内的类路径上有一个 XSLT 文件。我尝试使用InputStream 加载XSLT 文件。调试后，InputStream 包含 JAR 文件而不是 XSLT 文件。

String xslPath = "/com/japi/application/templates/foo.xslt";
InputStream is = getClass().getResourceAsStream(xslPath);
...
Source xslt = new StreamSource(is);
trans = factory.newTransformer(xsltSource); //Fatal error. Error parsing XSLT {0}

我已经仔细检查了 XSLT 文件的路径是否正确，并且 JAR 文件中包含一个物理文件。有什么想法吗？

Answer 1

创建自定义解析器以从类路径解析 将其设置为Transfromer 为了测试我在 Eclipse 项目的类路径中设置了一个 jar 文件

所有代码都在下面 ----- 运行示例 ------------- `

public class RunTransform {

    public static void main(String[] args) {

        //  SimpleTransform.transform("xsl/SentAdapter.xsl", "C:/Amin/AllWorkspaces/ProtoTypes/XsltDemo/xml/acc.xml");

        SimpleTransform.transform("xslt/ibanvalidation/accuity-ibanvalidationresponse.xsl", "C:/Amin/AllWorkspaces/ProtoTypes/XsltDemo/xml/acc.xml");
    }

}

-----------Sample transfomring example ----------------

package com;

import java.io.File;
import java.io.FileOutputStream;


import javax.xml.transform.Templates;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.URIResolver;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;


public class SimpleTransform {

    public static void transform(String xslName,String xmlName) {
        try {  
            ResourceResolver resloader = new ResourceResolver();
              TransformerFactory tFactory = TransformerFactory.newInstance();
              tFactory.setURIResolver(resloader);

              StreamSource xsltSRC = new StreamSource(resloader.resolve(xslName));

              Transformer transformer = tFactory.newTransformer(xsltSRC);

              StreamSource xmlSSRC = new StreamSource(xmlName);
              System.out.println("Streamm sources created .....");

              System.out.println("XSLT SET ....");
              transformer.transform(xmlSSRC, new StreamResult(new FileOutputStream(new File("C:/Amin/AllWorkspaces/ProtoTypes/XsltDemo/xml/result.xml"))));
              System.out.println("Finished transofrmation ..........");
              System.out.println("************* The result is out in respoinse *************");


             } catch (Throwable t) {
                      t.printStackTrace();
             }

    }

}

`

---

-----------自定义解析器的代码--------------- `

package com;

import javax.xml.transform.URIResolver;
import javax.xml.transform.Source;
import javax.xml.transform.TransformerException;
import javax.xml.transform.stream.StreamSource;
import java.io.InputStream;
import java.net.URL;
import java.util.Enumeration;
import java.util.Iterator;

public class ResourceResolver implements URIResolver {

    /* (non-Javadoc)
     * @see javax.xml.transform.URIResolver#resolve(java.lang.String, java.lang.String)
     */
    public Source resolve(String href, String base) throws TransformerException {

        try {

            InputStream is = ClassLoader.getSystemResourceAsStream(href);
            return new StreamSource(is, href);
        } // try
        catch (Exception ex) {
            throw new TransformerException(ex);
        } // catch
    } // resolve

    /**
     * @param href
     * @return
     * @throws TransformerException
     */
    public InputStream resolve(String href) throws TransformerException {
        try {

            InputStream is = ClassLoader.getSystemResourceAsStream(href);
            return is;
        } // try
        catch (Exception ex) {
            throw new TransformerException(ex);
        } // catch
    }
} // ResourceResolver

`

Answer 2

试试这个

String pathWithinJar = "com/example/xslt/dummy.xslt";
InputStream is = java.lang.ClassLoader.getSystemResourceAsStream(pathWithinJar);

然后您可以使用 IOUtils (apache) 或 here 的建议之一将 InputStream 转换为字符串，或者只使用接受输入流的 javax.xml...StreamSource 构造函数。

public static void transform(InputStream xslFileStream, File xmlSource, File xmlResult)
      throws TransformerException, IOException {

    // unknown if the factory is thread safe, always create new instance
    TransformerFactory factory = TransformerFactory.newInstance();
    StreamSource xslStreamSource = new StreamSource(xslFileStream);
    Transformer transformer = factory.newTransformer(xslStreamSource);

    StreamSource sourceDocument = new StreamSource(xmlSource);
    StreamResult resultDocument = new StreamResult(xmlResult);
    transformer.transform(sourceDocument, resultDocument);

    resultDocument.getOutputStream().flush();
    resultDocument.getOutputStream().close();
  }

Answer 3

InputStream 包含 jar 文件 xslt 文件

是什么让你这么说？您是否尝试将InputStream 的内容打印为文本？在创建 InputStream in 和使用它之间，您是否正在用它做其他事情（...部分）？

如果提供给getResourceAsStream 的路径指向一个XSLT，并且如果is 在调用后不是null，则is 应该包含代表XSLT 资源的InputStream。在这里粘贴整个堆栈跟踪怎么样？