使用 dom4j DOMDocument 提供 validator.validate(DOMSource) 在 java 1.6 中失败(不允许 xsi:noNamespaceSchemaLocation 出现在根元素中),在 1.5 中有效
我发现以下问题非常棘手(好吧,这是轻描淡写) - 任何见解将不胜感激。目前看来最好的想法是放弃 dom4j,转而使用例如XOM(http://stackoverflow.com/questions/831865/what-java-xml-library-do-you-recommend-to-replace-dom4j)。
我一直在内存中验证从 dom4j 'new DOMDocument()' 创建的 XML - 但这不适用于 Java 6。
以下对 dom4j (1.6.1) DOMDocument 派生的 DOMSource 的 validate(source) 的调用适用于 Java 1.5.x,但适用于 Java 1.6.x:
public void validate() throws Exception {
SchemaFactory schemaFactory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
schemaFactory.setErrorHandler(null);
Schema schemaXSD = schemaFactory.newSchema(new URL(getSchemaURLString()));
Validator validator = schemaXSD.newValidator();
DOMSource source = new DOMSource(getDocument());
validator.validate(source);
}
getSchemaURLString() 还用于向根节点添加 xsi:noNamespaceSchemaLocation 属性,即:
xsi:noNamespaceSchemaLocation="http://localhost:8080/integration/xsd/fqlResponseSchema-2.0.xsd"
例外情况如下:
Exception: org.xml.sax.SAXParseException: cvc-complex-type.3.2.2: Attribute 'xsi:noNamespaceSchemaLocation' is not allowed to appear in element 'specialfields'.;
complex-type.3.2.2: Attribute 'xsi:noNamespaceSchemaLocation' is not allowed to appear in element 'specialfields'.
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:195)
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.error(ErrorHandlerWrapper.java:131)
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:384)
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:318)
at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator$XSIErrorReporter.reportError(XMLSchemaValidator.java:417)
at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.reportSchemaError(XMLSchemaValidator.java:3182)
at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.processAttributes(XMLSchemaValidator.java:2659)
at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.handleStartElement(XMLSchemaValidator.java:2066)
at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.startElement(XMLSchemaValidator.java:705)
at com.sun.org.apache.xerces.internal.jaxp.validation.DOMValidatorHelper.beginNode(DOMValidatorHelper.java:273)
at com.sun.org.apache.xerces.internal.jaxp.validation.DOMValidatorHelper.validate(DOMValidatorHelper.java:240)
at com.sun.org.apache.xerces.internal.jaxp.validation.DOMValidatorHelper.validate(DOMValidatorHelper.java:186)
at com.sun.org.apache.xerces.internal.jaxp.validation.ValidatorImpl.validate(ValidatorImpl.java:104)
at javax.xml.validation.Validator.validate(Validator.java:127)
以下是禁用对 validator.validate(source) 的调用后生成的 XML 的开头:
<?xml version="1.0" encoding="utf-8"?>
<meetings xsi:noNamespaceSchemaLocation="http://localhost:8080/integration/xsd/fqlResponseSchema-2.0.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
.............
</meetings>
以及 XSD:
<?xml version="1.0" encoding="utf-8" ?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified">
<xs:element name="meetings">
<xs:complexType>
<xs:choice>
<xs:sequence>
<xs:element minOccurs="0" maxOccurs="1" ref="summary" />
<xs:element minOccurs="0" maxOccurs="unbounded" ref="meeting" />
</xs:sequence>
<xs:element ref="error" />
</xs:choice>
</xs:complexType>
</xs:element>
<xs:element name="summary">
................
因此,我的根元素被拒绝,因为它包含 xsi:noNamespaceSchemaLocation 属性。并且架构本身没有将其指定为我的根元素的有效属性?
此时,在我看来,我需要放弃 dom4j 来完成此任务,并切换到其他解决方案之一,例如此处概述的:
但无论如何,我想知道我做错了什么!
提前致谢。