Dom4j知识集锦

Alex — Thu, 17 Feb 2011 06:54:41 +0000

如何禁止加载XSD和DTD

SAXReader reader = new SAXReader( true );
reader.setFeature( Constants.XERCES_FEATURE_PREFIX + Constants.LOAD_EXTERNAL_DTD_FEATURE, false );

DTD验证，无法联网时报错

通过指定本地的DTD文档来解决：

SAXReader reader = new SAXReader( true );
reader.setEntityResolver( new EntityResolver() {

    public InputSource resolveEntity( String publicId, String systemId )
    {
        if ( publicId.equals( "-//Hibernate/Hibernate Mapping DTD 3.0//EN" ) )
        {
            InputStream in = getClass().getResourceAsStream( "/hibernate-mapping-3.0.dtd" );
            return new InputSource( in );
        }
        return null;
    }
} );

使用JAXP来进行XSD验证

InputStream is = Thread.currentThread().getContextClassLoader().getResourceAsStream( XSD_FILE_PATH );
javax.xml.validation.SchemaFactory factory = SchemaFactory.newInstance( XMLConstants.W3C_XML_SCHEMA_NS_URI );
new StreamSource( is ) ).newValidator();
validator.validate( new StreamSource( new StringReader( xml ) ) );

Dom4j如何格式化XML输出

StringWriter sw = new StringWriter();
XMLWriter writer = new XMLWriter( sw, OutputFormat.createPrettyPrint() );
try
{
    writer.write( doc );
}
catch ( IOException e )
{
    // impossible
}

如何使用XPath解析带名字空间的XML

SAXReader reader = new SAXReader();
Map nameSpaceMap = new HashMap();
nameSpaceMap.put( "beans", "http://www.springframework.org/schema/beans" );
reader.getDocumentFactory().setXPathNamespaceURIs( nameSpaceMap );
Document doc = reader.read( new ClassPathResource( APP_CTX_FILE_NAME ).getInputStream() );
Element e = (Element) doc.getRootElement().selectSingleNode("beans:bean[@id='canaryConfig']/beans:property[@name='baseDir']" );
bd = e.attributeValue( "value" );

Dom4j访问者模式中，删除节点导致NullPointerException

报错：java.lang.NullPointerException at org.dom4j.tree.AbstractElement.accept(AbstractElement.java:208)
解决：在访问者中记录需要删除的节点，访问结束后一起删除。

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Dom4j知识集锦