java - 针对 XML 架构(XSD 文件)的通用 XML 文件 validator

Question

我想使用 JAXB 创建一个通用的 xmlFileValidator，它接受一个 XML 文件和一个架构文件，如果文件有效，则返回根类的对象，否则抛出 SAXException 或 JAXBException。

public class XmlValidateEventHandler implements ValidationEventHandler {
public static <E> void validator(File xsdFile, File xmlFile, E obj) throws SAXException, JAXBException
{
    JAXBContext jaxbcontextobj = JaxbUtil.create_context_obj(new ObjectFactory());
    SchemaFactory sf = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
    Schema schema = sf.newSchema(xsdFile);
    Unmarshaller unmarshaller = JaxbUtil.create_unmarshl_obj(jaxbcontextobj);

    unmarshaller.setSchema(schema);
    unmarshaller.setEventHandler(new XmlValidateEventHandler());        
    javax.xml.bind.JAXBElement<Document>  doc = (javax.xml.bind.JAXBElement<Document>) unmarshaller.unmarshal(xmlFile);
    Document d = doc.getValue();
    obj=(E)d;
}

@Override
public boolean handleEvent(ValidationEvent event) {

    Logger logger = utility.JaxbUtil.getLogger();
    if(event.getSeverity() == ValidationEvent.ERROR || event.getSeverity() == ValidationEvent.FATAL_ERROR)
    {                           
        //Logger logger = Logger.getLogger(XmlValidateEventHandler.class);              
        logger.error("SEVERITY:  " + event.getSeverity());          
        logger.error("MESSAGE:  " + event.getMessage());            
        logger.error("LINKED EXCEPTION:  " + event.getLinkedException());           
        logger.error("LINE NUMBER:  " + event.getLocator().getLineNumber());
        logger.error("COLUMN NUMBER:  " + event.getLocator().getColumnNumber());
        logger.error("***** Give XML is invalid aginst given XSD *****");
        return false;
    }   
}

}

以下行给出警告 ->

Type safety: Unchecked cast from Object to JAXBElement

javax.xml.bind.JAXBElement<Document>  doc=(javax.xml.bind.JAXBElement<Document>) unmarshaller.unmarshal(xmlFile);

而且我也无法映射未编码的对象并将其设置为在参数中传递的E obj。我知道它可以返回，但我被要求将其设置为该参数。请帮忙。提前致谢

Answer 1

我更改为以下并且有效:

    public static <E> E validator(File xsdFile, File xmlFile, E obj) throws SAXException, JAXBException
{   
    JAXBContext jaxbcontextobj = JaxbUtil.setContextObj(new ObjectFactory());
    SchemaFactory sf = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
    Schema schema = sf.newSchema(xsdFile);
    Unmarshaller unmarshaller = JaxbUtil.setUnmarshlObj(jaxbcontextobj);

    unmarshaller.setSchema(schema);
    unmarshaller.setEventHandler(new XmlValidateEventHandler());        
    javax.xml.bind.JAXBElement<E>  doc = (javax.xml.bind.JAXBElement<E>) unmarshaller.unmarshal(xmlFile);
    E d = (E) doc.getValue();
    return d;
}

但现在仍然有开放的结局:1. 我仍然无法将对象映射到第三个参数 -> E obj2.我正在使用 JAXB 生成的类中的 ObjectFactory :

import XmlClasses.ObjectFactory;

这仍然使它不完全通用，如何采用通用的 ObjectFactory ??