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文中代码部分引用自 DOM4J 文档。

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    // 从文件读取 XML ，输入文件名，返回 XML 文档

    publicDocumentread(StringfileName)throwsMalformedURLException,DocumentException{

       SAXReaderreader=newSAXReader();

       Documentdocument=reader.read(newFile(fileName));

       returndocument;

    }

　   public Element getRootElement(Document doc){

       returndoc.getRootElement();

    }

    // 枚举所有子节点

    for ( Iterator i = root.elementIterator(); i.hasNext(); ) {

       Elementelement=(Element)i.next();

       // do something

    }

    // 枚举名称为 foo 的节点

    for ( Iterator i = root.elementIterator( foo ); i.hasNext();) {

       Elementfoo=(Element)i.next();

       // do something

    }

    // 枚举属性

    for ( Iterator i = root.attributeIterator(); i.hasNext(); ) {

       Attributeattribute=(Attribute)i.next();

       // do something

												
														
																    
														}

										

    publicvoidtreeWalk(){

       treeWalk(getRootElement());

    }

    publicvoidtreeWalk(Elementelement){

       for(inti=0,size=element.nodeCount();i<size;i++)    {

           Nodenode=element.node(i);

           if(nodeinstanceofElement){

              treeWalk((Element)node);

           }else{// do something....

           }

       }

}

　        publicclassMyVisitorextendsVisitorSupport{

           publicvoidvisit(Elementelement){

               System.out.println(element.getName());

           }

           public void visit(Attribute attr){

               System.out.println(attr.getName());

           }

												        
												}
										

												        
												调用：
												  root.accept(new MyVisitor())

										

   publicvoidbar(Documentdocument){

        Listlist=document.selectNodes(//foo/bar);

        Nodenode=document.selectSingleNode(//foo/bar/author);

        Stringname=node.valueOf(@name);

     }

    publicvoidfindLinks(Documentdocument)throwsDocumentException{

        Listlist=document.selectNodes(//a/@href);

        for(Iteratoriter=list.iterator();iter.hasNext();){

            Attributeattribute=(Attribute)iter.next();

            Stringurl=attribute.getValue();

        }

     }

												    
												// XML
												转字符串
												
												
										

　 Document document = ...;

    Stringtext=document.asXML();

// 字符串转 XML

    Stringtext=<person> <name>James</name> </person>;

    Documentdocument=DocumentHelper.parseText(text);

   publicDocumentstyleDocument(

       Documentdocument,

       Stringstylesheet

    )throwsException{

    // load the transformer using JAXP

    TransformerFactoryfactory=TransformerFactory.newInstance();

    Transformertransformer=factory.newTransformer(

       newStreamSource(stylesheet)

    );

    // now lets style the given document

    DocumentSourcesource=newDocumentSource(document);

    DocumentResultresult=newDocumentResult();

    transformer.transform(source,result);

    // return the transformed document

    DocumenttransformedDoc=result.getDocument();

    returntransformedDoc;

}

    publicDocumentcreateDocument(){

       Documentdocument=DocumentHelper.createDocument();

       Elementroot=document.addElement(root);

       Elementauthor1=

           root

              .addElement(author)

              .addAttribute(name,James)

              .addAttribute(location,UK)

              .addText(James Strachan);

       Elementauthor2=

           root

              .addElement(author)

              .addAttribute(name,Bob)

              .addAttribute(location,US)

              .addText(Bob McWhirter);

       returndocument;

    }

    FileWriter out = new FileWriter( foo.xml );

    document.write(out);

    publicvoidwrite(Documentdocument)throwsIOException{

       // 指定文件

       XMLWriterwriter=newXMLWriter(

           newFileWriter(output.xml)

       );

       writer.write(document);

       writer.close();

       // 美化格式

       OutputFormatformat=OutputFormat.createPrettyPrint();

       writer=newXMLWriter(System.out,format);

       writer.write(document);

       // 缩减格式

       format=OutputFormat.createCompactFormat();

       writer=newXMLWriter(System.out,format);

       writer.write(document);

    }