java类库详细讲解

				
				
				
				Getting the Value of an Entity Reference in a DOM Document
				(Java Developers Almanac Example)
				
				
				
				
				
				
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				The Java Developers Almanac 1.4
				
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				    org.w3c.dom
				         [30 examples]
				        
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				        Getting Nodes
				             [5 examples]
				            
				
				  
				    e530.  
				    Getting the Value of an Entity Reference in a DOM Document
				
				The value of an entity reference is kept in the child nodes of the
				EntityReference node. This example demonstrates an entity reference
				with three children.
				
				
				Note: By default, a parser expands entity references while
				constructing the DOM tree. See e516 Preventing Expansion of Entity References While Parsing an XML File
				to prevent expansion.
				
				
				
				    // Obtain a document; the following method is implemented in
				    // e516 Preventing Expansion of Entity References While Parsing an XML File
				    Document doc = parseXmlFileNoExpandER("infilename.xml", false);
				    
				    // Get the entity reference (see input file)
				    Element root = doc.getDocumentElement();
				    EntityReference eref = (EntityReference)root.getFirstChild();
				    
				    // The first child of the entity reference is comment
				    Comment comment = (Comment)eref.getFirstChild();               // comment
				    
				    // The second child of the entity reference is an element
				    Element elem = (Element)eref.getFirstChild().getNextSibling(); // <i>
				    
				    // The third child of the entity reference is a text
				    Text text = (Text)eref.getLastChild();                         // text
				
				This is the sample input for the example:
				
				
				    <?xml version="1.0" encoding="UTF-8"?>
				    <!DOCTYPE root [
				        <!ENTITY entity "<!--comment--><i/>text">
				    ]>
				    <root>&entity;</root>
				
				
				
				
				             Related Examples
				        
				
				
				
				
				e1071. 
				    Getting the Root Element in a DOM Document
				
				
				
				e527. 
				    Getting a Node Relative to Another Node in a DOM Document
				
				
				
				e528. 
				    Getting the Notations in a DOM Document
				
				
				
				e529. 
				    Getting the Declared Entities in a DOM Document
				
				
				
				
				
				
				
				
				        See also: 
				
				    Adding and Removing Nodes
				  
				
				
				    Element Attributes
				  
				
				
				    Elements
				  
				
				
				    Text Nodes
				  
				
				
				    XPath
				  
				
				
				
				
				
				
				
				
				
				© 2002 Addison-Wesley.