TransformerConfigurationException：无法为 Transformer 设置功能答案

【问题标题】：TransformerConfigurationException: Cannot set the feature for TransformerTransformerConfigurationException：无法为 Transformer 设置功能
【发布时间】：2018-05-08 13:30:40
【问题描述】：

我在为 TransformerFactory 设置功能时遇到错误。

javax.xml.transform.TransformerConfigurationException: Cannot set the feature 'http://apache.org/xml/features/disallow-doctype-decl' on this TransformerFactory.
        at org.apache.xalan.processor.TransformerFactoryImpl.setFeature(TransformerFactoryImpl.java:416)

代码 sn-p 是::

public static TransformerFactory mytFactory;

mytFactory = TransformerFactory.newInstance();
mytFactory.setFeature(“http://apache.org/xml/features/disallow-doctype-decl“, true);

请帮我解决这个问题。

【问题讨论】：

标签： security java-8 saxparser xalan javax

【解决方案1】：

我也未能调用 TransformerFactoryImpl 的方法“setFeature”。我找到了其他使用 XMLReader 设置功能的方法，如下所示：

XMLReader reader = XMLReaderFactory.createXMLReader();
reader.setFeature("http://apache.org/xml/features/disallow-doctype-decl", true);

Source xmlSource = new SAXSource(reader, new InputSource(new FileInputStream(xmlFile)));
Transformer transformer = TransformerFactory.newInstance().newTransformer();
StreamResult result = new StreamResult(new StringWriter());
transformer.transform(xmlSource, result);

设置完成后，如果输入中有 DOCTYPE 标签，就会出现以下异常：

javax.xml.transform.TransformerException: org.xml.sax.SAXParseException; lineNumber: 2; columnNumber: 10; DOCTYPE is disallowed when the feature "http://apache.org/xml/features/disallow-doctype-decl" set to true.
    at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:749)
    at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:351)
    at ch.ofwi.pa.webservice.provideraccounting.impl.handler.SchemaValidationHandler.main(SchemaValidationHandler.java:227)
Caused by: org.xml.sax.SAXParseException; lineNumber: 2; columnNumber: 10; DOCTYPE is disallowed when the feature "http://apache.org/xml/features/disallow-doctype-decl" set to true.
    at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1239)
    at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transformIdentity(TransformerImpl.java:668)
    at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:737)

希望对你有帮助。

【讨论】：