在 ServiceMix 中实现 XSLT答案

【问题标题】：Implementing XSLT within ServiceMix在 ServiceMix 中实现 XSLT
【发布时间】：2018-09-29 07:33:27
【问题描述】：

我正在尝试编写一个 xslt，它接受一个 html 页面并对其进行转换，以便它只包含 id 为“content”的 div 标记的内容。我正在使用 Apache ServiceMix 开发一个执行此操作但完全迷失的服务单元！

到目前为止，我已经创建了一个单元（至少我认为它这样做）获取一个文件，应用转换并将其保存到输出文件夹：

<?xml version="1.0" encoding="UTF-8"?>
<blueprint
    xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="

http://www.osgi.org/xmlns/blueprint/v1.0.0

      http://www.osgi.org/xmlns/blueprint/v1.0.0/blueprint.xsd">

    <camelContext xmlns="http://camel.apache.org/schema/blueprint">
      <route>
        <from uri="file:camel/input"/>
        <log message="Moving ${file:name} to the output directory"/>
        <to uri="xslt:file:///transform.xsl"/>
        <to uri="file:camel/output"/>
      </route>
    </camelContext>

</blueprint>

和一个转换 .xsl 文件：

<xsl:stylesheet version="1.0"
 xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
 xmlns:xhtml="http://www.w3.org/1999/xhtml"
 xmlns="http://www.w3.org/1999/xhtml"
 exclude-result-prefixes="xhtml">
    <xsl:template match="/">
        <html>
            <head><title>HTML Transformation</title></head>
            <body>
                <xsl:copy-of select="//xhtml:DIV[@id='content']"/>
            </body>
        </html>
    </xsl:template>
</xsl:stylesheet>

但它一直抛出这个错误：

21:23:50,395 | INFO  | le://camel/input | route3                           | 91 - org.apache.camel.camel-core - 2.8.5 | Moving INPUTFILE.html to the output directory
21:23:50,850 | ERROR | le://camel/input | DefaultErrorHandler              | 91 - org.apache.camel.camel-core - 2.8.5 | Failed delivery for exchangeId: ID-servicemix-48257-1358413760241-2-2137. Exhausted after delivery attempt: 1 caught: javax.xml.transform.TransformerException: java.io.IOException: Server returned HTTP response code: 403 for URL: http://www.w3c.org/TR/1999/REC-html401-19991224/loose.dtd
javax.xml.transform.TransformerException: java.io.IOException: Server returned HTTP response code: 403 for URL: http://www.w3c.org/TR/1999/REC-html401-19991224/loose.dtd
    at org.apache.xalan.transformer.TransformerImpl.fatalError(TransformerImpl.java:782)[:]
    at org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:756)[:]
    at org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:1273)[:]
    at org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:1251)[:]
    at org.apache.camel.builder.xml.XsltBuilder.process(XsltBuilder.java:123)[91:org.apache.camel.camel-core:2.8.5]
    at org.apache.camel.impl.ProcessorEndpoint.onExchange(ProcessorEndpoint.java:102)[91:org.apache.camel.camel-core:2.8.5]
    at org.apache.camel.impl.ProcessorEndpoint$1.process(ProcessorEndpoint.java:72)[91:org.apache.camel.camel-core:2.8.5]
    at org.apache.camel.impl.converter.AsyncProcessorTypeConverter$ProcessorToAsyncProcessorBridge.process(AsyncProcessorTypeConverter.java:48)[91:org.apache.camel.camel-core:2.8.5]
    at org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:78)[91:org.apache.camel.camel-core:2.8.5]
    at org.apache.camel.processor.SendProcessor$2.doInAsyncProducer(SendProcessor.java:114)[91:org.apache.camel.camel-core:2.8.5]
    at org.apache.camel.impl.ProducerCache.doInAsyncProducer(ProducerCache.java:284)[91:org.apache.camel.camel-core:2.8.5]
    at org.apache.camel.processor.SendProcessor.process(SendProcessor.java:109)[91:org.apache.camel.camel-core:2.8.5]
    at org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:78)[91:org.apache.camel.camel-core:2.8.5]
    at org.apache.camel.processor.DelegateAsyncProcessor.processNext(DelegateAsyncProcessor.java:98)[91:org.apache.camel.camel-core:2.8.5]
    at org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:89)[91:org.apache.camel.camel-core:2.8.5]
    at org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:69)[91:org.apache.camel.camel-core:2.8.5]
    at org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:78)[91:org.apache.camel.camel-core:2.8.5]
    at org.apache.camel.processor.DelegateAsyncProcessor.processNext(DelegateAsyncProcessor.java:98)[91:org.apache.camel.camel-core:2.8.5]
    at org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:89)[91:org.apache.camel.camel-core:2.8.5]
    at org.apache.camel.processor.interceptor.TraceInterceptor.process(TraceInterceptor.java:90)[91:org.apache.camel.camel-core:2.8.5]
    at org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:78)[91:org.apache.camel.camel-core:2.8.5]
    at org.apache.camel.processor.RedeliveryErrorHandler.processErrorHandler(RedeliveryErrorHandler.java:318)[91:org.apache.camel.camel-core:2.8.5]
    at org.apache.camel.processor.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:209)[91:org.apache.camel.camel-core:2.8.5]
    at org.apache.camel.processor.DefaultChannel.process(DefaultChannel.java:306)[91:org.apache.camel.camel-core:2.8.5]
    at org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:78)[91:org.apache.camel.camel-core:2.8.5]
    at org.apache.camel.processor.Pipeline.process(Pipeline.java:116)[91:org.apache.camel.camel-core:2.8.5]
    at org.apache.camel.processor.Pipeline.process(Pipeline.java:79)[91:org.apache.camel.camel-core:2.8.5]
    at org.apache.camel.processor.UnitOfWorkProcessor.processAsync(UnitOfWorkProcessor.java:139)[91:org.apache.camel.camel-core:2.8.5]
    at org.apache.camel.processor.UnitOfWorkProcessor.process(UnitOfWorkProcessor.java:106)[91:org.apache.camel.camel-core:2.8.5]
    at org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:78)[91:org.apache.camel.camel-core:2.8.5]
    at org.apache.camel.processor.DelegateAsyncProcessor.processNext(DelegateAsyncProcessor.java:98)[91:org.apache.camel.camel-core:2.8.5]
    at org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:89)[91:org.apache.camel.camel-core:2.8.5]
    at org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:69)[91:org.apache.camel.camel-core:2.8.5]
    at org.apache.camel.component.file.GenericFileConsumer.processExchange(GenericFileConsumer.java:353)[91:org.apache.camel.camel-core:2.8.5]
    at org.apache.camel.component.file.GenericFileConsumer.processBatch(GenericFileConsumer.java:176)[91:org.apache.camel.camel-core:2.8.5]
    at org.apache.camel.component.file.GenericFileConsumer.poll(GenericFileConsumer.java:137)[91:org.apache.camel.camel-core:2.8.5]
    at org.apache.camel.impl.ScheduledPollConsumer.doRun(ScheduledPollConsumer.java:139)[91:org.apache.camel.camel-core:2.8.5]
    at org.apache.camel.impl.ScheduledPollConsumer.run(ScheduledPollConsumer.java:91)[91:org.apache.camel.camel-core:2.8.5]
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:439)[:1.6.0_38]
    at java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:317)[:1.6.0_38]
    at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:150)[:1.6.0_38]
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(ScheduledThreadPoolExecutor.java:98)[:1.6.0_38]
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.runPeriodic(ScheduledThreadPoolExecutor.java:180)[:1.6.0_38]
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:204)[:1.6.0_38]
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)[:1.6.0_38]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)[:1.6.0_38]
    at java.lang.Thread.run(Thread.java:662)[:1.6.0_38]
Caused by: java.io.IOException: Server returned HTTP response code: 403 for URL: http://www.w3c.org/TR/1999/REC-html401-19991224/loose.dtd
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1459)[:1.6.0_38]
    at org.apache.xerces.impl.XMLEntityManager.setupCurrentEntity(Unknown Source)[:]
    at org.apache.xerces.impl.XMLEntityManager.startEntity(Unknown Source)[:]
    at org.apache.xerces.impl.XMLEntityManager.startDTDEntity(Unknown Source)[:]
    at org.apache.xerces.impl.XMLDTDScannerImpl.setInputSource(Unknown Source)[:]
    at org.apache.xerces.impl.XMLDocumentScannerImpl$DTDDispatcher.dispatch(Unknown Source)[:]
    at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)[:]
    at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)[:]
    at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)[:]
    at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)[:]
    at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)[:]
    at org.apache.xml.dtm.ref.DTMManagerDefault.getDTM(DTMManagerDefault.java:439)[:]
    at org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:699)[:]
    ... 45 more

我不知道这是什么意思:( 有人可以帮忙吗？

谢谢大家

【问题讨论】：

要加载到解析器中以在其上运行 XSLT 的页面的 URL 是什么？您用来运行 XSLT 的代码是什么？操作似乎失败了，因为您的解析器找不到您要加载的页面的 DTD 文件，而且 DTD 确实似乎无法访问。
啊，太好了，谢谢@JLRishe！我正在访问的网页中的 !DOCTYPE 标签是一团糟，所以我只是将其替换为 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> 并且它起作用了！（虽然我仍然遇到错误，但我很确定它们不相关）
太棒了。现在我知道这是问题所在，我在答案部分添加了更彻底的回应。 :-)

标签： html xml xslt apache-servicemix

【解决方案1】：

正如 cmets 中所讨论的，这里的问题是您正在访问的 HTML 页面中的 DTD 引用了一个不可访问的文件，这导致解析器在尝试访问该文件时失败。

如果 HTML 是您可以修改的，一个可能的解决方案是修改 DTD（看起来 HTML4 松散的 DTD 可以通过以下 URL 访问：http://www.w3.org/TR/html4/loose.dtd）。您正在使用的解析器可能有一个忽略 DTD 的选项，但这可能不是最佳选择，因为文档可能使用纯 HTML 实体，例如 &nbsp;。

【讨论】：