DOM4J的使用示例

示例1：

package com.shengsiyuan.dom4j;

import java.io.FileOutputStream;
import java.io.FileWriter;

import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.XMLWriter;

public class Test1
{
    public static void main(String[] args) throws Exception
    {
        // 创建文档并设置文档的根元素节点 ：第一种方式
        // Document document = DocumentHelper.createDocument();
        //
        // Element root = DocumentHelper.createElement("student");
        //
        // document.setRootElement(root);

        // 创建文档并设置文档的根元素节点 ：第二种方式
        Element root = DocumentHelper.createElement("student");
        Document document = DocumentHelper.createDocument(root);

        root.addAttribute("name", "zhangsan");

        Element helloElement = root.addElement("hello");
        Element worldElement = root.addElement("world");

        helloElement.setText("hello");
        worldElement.setText("world");

        helloElement.addAttribute("age", "20");

        XMLWriter xmlWriter = new XMLWriter();
        xmlWriter.write(document);
        
        OutputFormat format = new OutputFormat("    ", true);
        
        XMLWriter xmlWriter2 = new XMLWriter(new FileOutputStream("student2.xml"), format);
        xmlWriter2.write(document);
        
        XMLWriter xmlWriter3 = new XMLWriter(new FileWriter("student3.xml"), format);
        
        xmlWriter3.write(document);
        xmlWriter3.close();

    }
}

示例2：

package com.shengsiyuan.dom4j;

import java.io.File;
import java.util.Iterator;
import java.util.List;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.DOMReader;
import org.dom4j.io.SAXReader;

public class Test2
{
    public static void main(String[] args) throws Exception
    {
        SAXReader saxReader = new SAXReader();
        
        Document doc = saxReader.read(new File("student2.xml"));
        
        Element root = doc.getRootElement();
        
        System.out.println("root element: " + root.getName());
        
        List childList = root.elements();
        
        System.out.println(childList.size());
        
        List childList2 = root.elements("hello");
        
        System.out.println(childList2.size());
        
        Element first = root.element("hello");
        
        System.out.println(first.attributeValue("age"));
        
        for(Iterator iter = root.elementIterator(); iter.hasNext();)
        {
            Element e = (Element)iter.next();
            
            System.out.println(e.attributeValue("age"));
        }
        
        System.out.println("---------------------------");
        
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        DocumentBuilder db = dbf.newDocumentBuilder();
        org.w3c.dom.Document document = db.parse(new File("student2.xml"));
        
        DOMReader domReader = new DOMReader();
        
        //将JAXP的Document转换为dom4j的Document
        Document d = domReader.read(document);
        
        Element rootElement = d.getRootElement();
        
        System.out.println(rootElement.getName());
    }
}

示例3：

package com.shengsiyuan.dom4j;

import java.io.FileWriter;

import org.jdom.Attribute;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.output.Format;
import org.jdom.output.XMLOutputter;

public class Test3
{
    public static void main(String[] args) throws Exception
    {
        Document document = new Document();

        Element root = new Element("联系人列表").setAttribute(new Attribute("公司",
                "A集团"));

        document.addContent(root);
        
        Element contactPerson = new Element("联系人");
        
        root.addContent(contactPerson);

        contactPerson
                .addContent(new Element("姓名").setText("张三"))
                .addContent(new Element("公司").setText("A公司"))
                .addContent(new Element("电话").setText("021-55556666"))
                .addContent(
                        new Element("地址")
                                .addContent(new Element("街道").setText("5街"))
                                .addContent(new Element("城市").setText("上海"))
                                .addContent(new Element("省份").setText("上海市")));

        XMLOutputter output = new XMLOutputter(Format.getPrettyFormat()
                .setIndent("    ").setEncoding("gbk"));

        output.output(document, new FileWriter("contact.xml"));

    }
}