从xml DOM中删除节点，xmldom删除节点,package cn.o

从xml DOM中删除节点，xmldom删除节点,package cn.o

package cn.outofmemory.snippets.core;import java.io.File;import java.io.FileInputStream;import java.io.StringWriter;import java.io.Writer;import javax.xml.parsers.DocumentBuilder;import javax.xml.parsers.DocumentBuilderFactory;import javax.xml.transform.OutputKeys;import javax.xml.transform.Transformer;import javax.xml.transform.TransformerFactory;import javax.xml.transform.dom.DOMSource;import javax.xml.transform.stream.StreamResult;import org.w3c.dom.Document;import org.w3c.dom.Node;import org.w3c.dom.NodeList;public class RemoveNodesFromDOMDocumentRecursively {    public static void main(String[] args) throws Exception {        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();        dbf.setValidating(false);        DocumentBuilder db = dbf.newDocumentBuilder();        Document doc = db.parse(new FileInputStream(new File("in.xml")));        // remove all elements named 'item'        removeRecursively(doc, Node.ELEMENT_NODE, "item");        // remove all comment nodes        removeRecursively(doc, Node.COMMENT_NODE, null);        // Normalize the DOM tree, puts all text nodes in the        // full depth of the sub-tree underneath this node        doc.normalize();        prettyPrint(doc);    }    public static void removeRecursively(Node node, short nodeType, String name) {        if (node.getNodeType()==nodeType && (name == null || node.getNodeName().equals(name))) {            node.getParentNode().removeChild(node);        }        else {            // check the children recursively            NodeList list = node.getChildNodes();            for (int i = 0; i < list.getLength(); i++) {                removeRecursively(list.item(i), nodeType, name);            }        }    }    public static final void prettyPrint(Document xml) throws Exception {        Transformer tf = TransformerFactory.newInstance().newTransformer();        tf.setOutputProperty(OutputKeys.ENCODING, "UTF-8");        tf.setOutputProperty(OutputKeys.INDENT, "yes");        Writer out = new StringWriter();        tf.transform(new DOMSource(xml), new StreamResult(out));        System.out.println(out.toString());    }}

Xml文档如下

<?xml version="1.0" encoding="UTF-8"?><rss version="2.0">    <channel>        <title>Java Tutorials and Examples</title>        <item>            <title><![CDATA[Java Tutorials]]></title>            <link>http://www.javacodegeeks.com/</link>        </item>        <item>            <title><![CDATA[Java Examples]]></title>            <link>http://examples.javacodegeeks.com/</link>        </item>    </channel></rss>

输出：

<?xml version="1.0" encoding="UTF-8" standalone="no"?><rss version="2.0">    <channel>        <title>Java Tutorials and Examples</title>    </channel></rss>