为什么JAXB不想验证
我希望使用xsd,希望JAXB解组失败。 但事实并非如此。 为什么?
JAXB正在读取模式(如果模式XML错误,JAXB会提供异常),但它会在读取时接受JAXB忽略模式。
SchemaFactory sf = SchemaFactory.newInstance(javax.xml.XMLConstants.W3C_XML_SCHEMA_NS_URI);
Schema schema = sf.newSchema(getClass().getResource( "/schema1.xsd"));
JAXBContext context = JAXBContext.newInstance(Customer.class);
Unmarshaller unmarshaller = context.createUnmarshaller();
unmarshaller.setSchema( schema );
Customer c = JAXB.unmarshal(file, Customer.class);
书面的XML开始是这样的:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<ns2:customer xmlns:ns2="http://bla.com/">
即使附加的ValidationEventCollector也没有提供任何信息:
unmarshaller.setEventHandler(new JAXBEventCollector());
JAXBEventCollector是:
class JAXBEventCollector extends ValidationEventCollector
{
@Override
public boolean handleEvent(ValidationEvent event)
{
System.out.println(event.getLocator());
return true;
}
}
你的代码应该工作。 有几件事需要注意:
下面是一段代码,当无效的XML被解组时,肯定会引发错误。 此代码可与MOXy和Metro(RI)JAXB实现一起正常工作。
public static void main(String[] args) throws Exception {
SchemaFactory sf = SchemaFactory.newInstance(javax.xml.XMLConstants.W3C_XML_SCHEMA_NS_URI);
File xsd = new File("customer.xsd");
Schema schema = sf.newSchema(xsd);
JAXBContext context = JAXBContext.newInstance(Customer.class);
Unmarshaller unmarshaller = context.createUnmarshaller();
unmarshaller.setSchema( schema );
FileInputStream xml = new FileInputStream("invalid.xml");
unmarshaller.unmarshal(xml);
}
对于Metro,错误如下所示:
Exception in thread "main" javax.xml.bind.UnmarshalException
- with linked exception:
[org.xml.sax.SAXParseException: cvc-complex-type.2.4.a: Invalid content was found starting with element 'phone-numbers'. One of '{phoneNumbers}' is expected.]
at javax.xml.bind.helpers.AbstractUnmarshallerImpl.createUnmarshalException(AbstractUnmarshallerImpl.java:315)
at com.sun.xml.bind.v2.runtime.unmarshaller.UnmarshallerImpl.createUnmarshalException(UnmarshallerImpl.java:514)
at com.sun.xml.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal0(UnmarshallerImpl.java:215)
at com.sun.xml.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal(UnmarshallerImpl.java:184)
at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(AbstractUnmarshallerImpl.java:137)
at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(AbstractUnmarshallerImpl.java:184)
at example.gettingstarted.Demo2.main(Demo2.java:23)
使用MOXy时,错误如下所示:
Exception in thread "main" javax.xml.bind.UnmarshalException
- with linked exception:
[Exception [EclipseLink-25004] (Eclipse Persistence Services - 2.0.3.qualifier): org.eclipse.persistence.exceptions.XMLMarshalException
Exception Description: An error occurred unmarshalling the document
Internal Exception: org.xml.sax.SAXParseException: cvc-complex-type.2.4.a: Invalid content was found starting with element 'phone-numbers'. One of '{phoneNumbers}' is expected.]
at org.eclipse.persistence.jaxb.JAXBUnmarshaller.unmarshal(JAXBUnmarshaller.java:114)
at example.gettingstarted.Demo2.main(Demo2.java:23)
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