//contact.xml
<?xml version="1.0" encoding="utf-8"?>
<contactList>
    <contact id="001">
        <name>張三</name>
        <age>20</age>
        <phone>134222223333</phone>
        <email>[email protected]</email>
        <qq>432221111</qq
 
>
    </contact>
    <contact id="003">
        <name>lisi</name>
        <age>20</age>
        <phone>134222225555</phone>
        <email>[email protected]</email>
        <qq>432222222</qq>
    </contact>
</contactList>
 

import java.io.File;
import java.util.Iterator;
import java.util.List;
import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

public class Tests {
    public static void main(String[] args) throws DocumentException {
        SAXReader reader = new SAXReader();// 建立一個xml解析器物件
 

        Document doc = reader.read(new File("./src/contact.xml"));// 讀取xml文件，返回Document物件
        Element rootElement = doc.getRootElement();// 獲取xml文件的根標籤
        System.out.println("<" + rootElement.getName() + ">");
        List<Element> list = rootElement.elements(); // 獲取所有子標籤
        Iterator<Element> iterator = list.iterator();// 迭代器
        while (iterator.hasNext()) {
            Element element = iterator.next();
            System.out.print("  <" + element.getName());
            Attribute attribute = element.attribute("id");
            System.out.println(" " + attribute.getName() + "=\"" + attribute.getValue() + "\">");
            huoqu(element);
            System.out.println("    </" + element.getName() + ">");
        }
        System.out.println("</" + rootElement.getName() + ">");
    }

    private static void huoqu(Element elements) {
        List<Element> list2 = elements.elements();
        Iterator<Element> iterator = list2.iterator();
        while (iterator.hasNext()) {
            Element element = iterator.next();
            System.out
                    .println("      <" + element.getName() + ">" + element.getText() + "</" + element.getName() + ">");
        }
    }
}

//Console
<contactList>
    <contact id="001">
        <name>張三</name>
        <age>20</age>
        <phone>134222223333</phone>
        <email>[email protected]</email>
        <qq>432221111</qq>
    </contact>
    <contact id="003">
        <name>lisi</name>
        <age>20</age>
        <phone>134222225555</phone>
        <email>[email protected]</email>
        <qq>432222222</qq>
    </contact>
</contactList>