product.xml:

<?xml version="1.0" encoding="UTF-8"?> 
<root>
    <product>
        <index id="1">交換機</index>
        <index id="2">傳送網</index>
        <index id="3">WLAN</index>
        <index id="4">路由器</index>
    </product>
    
    <
 
scene>
        <index id="1">規劃</index>
        <index id="2">實施</index>
        <index id="3">維護</index>
    </scene>
</root>

代碼：

package com.cy.test;

import java.io.File;
import java.net.URLDecoder;
import java.util.HashMap;
import java.util.Iterator;
 
import java.util.List;
import java.util.Map;
import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

public class ReadXmlFile {
    public static void main(String[] args) throws Exception{
        String path = URLDecoder.decode(ReadXmlFile.class
 
.getClassLoader().getResource("").getPath(), "UTF-8") + "product.xml";
        
        SAXReader reader = new SAXReader();
        Document  document = reader.read(new File(path)); 
        
        //獲取文檔的根節點
        Element root = document.getRootElement(); 
        
        //獲取product的節點
        Element element = root.element("product");
        List<Element> proList = element.elements();
        for(Element e: proList){
            String value = e.getTextTrim();
            Attribute attr = e.attribute("id");
            String key = attr.getValue();
            System.out.println("key：" + key + "--value:" +value);
        }
        
        //獲取scene節點
        Element sElement = root.element("scene");
        List<Element> sList = sElement.elements();
        for(Element e : sList){
            String value = e.getTextTrim();
            String key = e.attributeValue("id");
            System.out.println("key:" + key + "----value:" + value);
        }
        
        
        //將xml轉化為map
        Map<Integer, String> prodcutMap = xml2Map(path);
        for (Map.Entry<Integer, String> entry : prodcutMap.entrySet()) {
            System.out.println("鍵= " + entry.getKey() + " and 值= " + entry.getValue());
        }
    }
    
    //將xml轉化為map
    public static Map<Integer, String> xml2Map(String path) throws Exception{
        Map<Integer, String> productMap = new HashMap<Integer, String>();
        Document  document = new SAXReader().read(path);
        Element root = document.getRootElement();                             //獲取根節點
        Iterator<Element> it = root.element("product").elementIterator();   //獲取根節點下的子節點product下面的所有節點
        while(it.hasNext()){
            Element e = (Element) it.next();
            Integer key = Integer.parseInt(e.attributeValue("id"));
            String value = e.getTextTrim();
            productMap.put(key, value);
        }
        
        return productMap;
    }
}

//可以將上面xml2Map改裝，傳入節點名字，nodeName，然後輸出map

console：

dom4j使用的小例子