同時讀取兩個XML文件，如果需要把一個XML 文件中的某個特定元素的內容插入到另外一個XML文件中時，要用importNode()方法，具體使用例子如下：

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import java.io.ByteArrayInputStream; import java.io.File; import java.io.IOException; import java.util.HashMap; import java.util.Map;import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory;import org.apache.commons.lang.StringUtils; import org.apache.tools.ant.Task; import org.w3c.dom.Document; import org.w3c.dom.Element; import org.w3c.dom.Node; import org.w3c.dom.NodeList; import org.xml.sax.EntityResolver; import org.xml.sax.InputSource; import org.xml.sax.SAXException;/*@author:duanqf*/ public class MergeBeanRefContext {private static Element sourceRoot;private static Element destRoot;private static Document sourceDoc;private static Document destDoc;public static void merge(String sourceXmlPath, String destXmlPath, Task task) {DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();try {factory.setIgnoringElementContentWhitespace(true);DocumentBuilder db = factory.newDocumentBuilder();db.setEntityResolver(new EntityResolver() {public InputSource resolveEntity(String publicId,String systemId) throws SAXException, IOException {if (publicId!=null && publicId.equals("-//SPRING//DTD BEAN//EN")) {return new InputSource(new ByteArrayInputStream("<?xml version='1.0' encoding='GBK'?>".getBytes())); }return null;}});sourceDoc = db.parse(new File(sourceXmlPath));sourceRoot = sourceDoc.getDocumentElement();destDoc = db.parse(new File(destXmlPath));destRoot = destDoc.getDocumentElement();execute(sourceDoc, destDoc, sourceRoot, destRoot, destXmlPath, task);} catch (Exception e) {e.printStackTrace();}}private static void execute(Document sourceDoc, Document destDoc,Element sourceRoot, Element destRoot, String destXmlPath, Task task) {Node constructorListNode = ParseXmlTools.selectSingleNode("/beans/bean[@id='qfContext']/constructor-arg/list",destRoot);NodeList destList = ParseXmlTools.selectNodes("value",constructorListNode);NodeList sourceList = ParseXmlTools.selectNodes("/beans/bean[@id='qfContext']/constructor-arg/list/value",sourceRoot);Map destPatternsMap = new HashMap();for (int j = 0; j < destList.getLength(); j++) {Node value = destList.item(j);if (value != null) {String valueStr = value.getTextContent();if (StringUtils.isNotBlank(valueStr)) {valueStr = valueStr.trim();destPatternsMap.put(valueStr, value);}}}for (int j = 0; j < sourceList.getLength(); j++) {Node value = sourceList.item(j);if (value != null) {String valueStr = value.getTextContent();if (destPatternsMap.get(valueStr) == null) {Node temp = destDoc.importNode(value, true);constructorListNode.appendChild(temp);// task.log("Add qfContext bean constructor-arg value:"// + valueStr);}}}//ParseXmlTools.saveXml(destXmlPath, destDoc);}

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總結

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