[Java] XML 解析 与 Dom4j 的使用

DOM4JTest.java

package com.bjsxt.dom4j;import java.io.File;import java.io.FileWriter;import java.io.IOException;import java.util.Iterator;import java.util.List;import org.dom4j.Attribute;import org.dom4j.Document;import org.dom4j.DocumentException;import org.dom4j.DocumentHelper;import org.dom4j.Element;import org.dom4j.Node;import org.dom4j.io.OutputFormat;import org.dom4j.io.SAXReader;import org.dom4j.io.XMLWriter;public class DOM4JTest {    public static void main(String[] args) throws Exception {        SAXReader reader = new SAXReader();        Document document = reader.read(new File("User.hbm.xml"));        Element rootElement = document.getRootElement();        p(rootElement.getName());        // 枚举所有子节点        for (Iterator i = rootElement.elementIterator(); i.hasNext();) {            Element element = (Element) i.next();            // do something            p(element.getName());            // 枚举属性            for (Iterator j = element.attributeIterator(); j.hasNext();) {                Attribute attribute = (Attribute) j.next();                // do something                p(attribute.getName() + "-" + attribute.getValue());            }        }        // xpath = xml+path        List<Node> list = document.selectNodes("//hibernate-mapping/class/property");        //Node node = document.selectSingleNode("//hibernate-mapping/class/property"); 只拿第一个        //String name = node.valueOf( @name );        for (Node n : list) {            p(n.getName());            p(n.valueOf("@name"));        }        createDocument();            }    public static void p(Object o) {        System.out.println(o);    }    public static Document createDocument() throws Exception {           Document document = DocumentHelper.createDocument();           Element root = document.addElement("hibernate-mapping");           Element classElement = root.addElement("class")                   .addAttribute("name", "com.bjsxt.User")                   .addAttribute("table", "t_user");           classElement.addElement("property").addAttribute("name", "username");           /*           FileWriter out = new FileWriter("User1.hbm.xml");           document.write(out);           out.flush();           out.close();           */           // 美化格式           OutputFormat format = OutputFormat.createPrettyPrint();           XMLWriter writer = new XMLWriter(                   new FileWriter( "User2.hbm.xml" ), format               );               writer.write( document );               writer.close();                      return document;        }     }

User.hbm.xml

<hibernate-mapping><class name="com.bjsxt.User" table="t_user"><property name="username"></property><property name="password"></property></class></hibernate-mapping>

User2.hbm.xml

<?xml version="1.0" encoding="UTF-8"?><hibernate-mapping>  <class name="com.bjsxt.User" table="t_user">    <property name="username"/>  </class></hibernate-mapping>

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