用dom4j解析xml文件并执行增删改查操作

转自：https://www.aliyun.com/jiaocheng/1339446.html

xml文件:
<?xml version="1.0" encoding="GBK"?>

<phoneinfo> 
  <brand name="小米" id="1"> 
    <type name="MI5"/>  
    <type name="NOTE"/>  
    <type name="MI5S"/> 
  </brand>  
  <brand name="华为" id="2"> 
    <type name="荣耀8"/>  
    <type name="荣耀8plus"/> 
  </brand>  
  <brand name="苹果" id="3">
    <type name="iphone7"/>
    <type1 name="iphone6"/>
  </brand>
</phoneinfo>


用dom4j解析xml文件
package com.hfxt;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.util.Iterator;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;

//dom4j解析xml并且执行(增、删、改、查)操作
public class dom4jXmlDemo {

    private Document document;
    
    public static void main(String[] args){
        dom4jXmlDemo domXml = new dom4jXmlDemo();
        domXml.getDom();
        domXml.addPhoneInfo();
        domXml.updatePhoneInfo();
        //domXml.deletePhoneInfo();
        domXml.showPhoneInfo();

    }
    
    //获取DOM树
    public void getDom(){
        SAXReader reader = new SAXReader();
        try {
            document = reader.read(new File("phoneinfo.xml"));
        } catch (DocumentException e) {
            e.printStackTrace();
        }
    }
    
    //增加手机信息
    public void addPhoneInfo(){
        //获取根节点元素
        Element element = document.getRootElement();
        //添加brand节点
        Element brand = element.addElement("brand");
        //为brand添加属性并且赋值
        brand.addAttribute("name","苹果");
        //添加type节点
        Element type = brand.addElement("type");
        Element type1 = brand.addElement("type1");
        //为type节点添加name属性并且赋值
        type.addAttribute("name","iphone7");
        type1.addAttribute("name","iphone6");
        saveXml("phoneinfo.xml");
    }
    
    //删除手机信息
    public void deletePhoneInfo(){
        //获取根节点
        Element element = document.getRootElement();
        Iterator brand = element.elementIterator();
        //遍历获取每个节点信息
        while(brand.hasNext()){
            Element eleBrand = (Element)brand.next();
            //删除name为苹果的brand
            if(eleBrand.attributeValue("name").equals("苹果")){
                eleBrand.getParent().remove(eleBrand);
            }
        }
        //保存信息
        saveXml("phoneinfo.xml");
    }

    //修改手机信息
    public void updatePhoneInfo(){
        //获取手机信息
        Element element = document.getRootElement();
        Iterator brand = element.elementIterator();
        int id = 0;
        while(brand.hasNext()){
            Element eleBrand = (Element)brand.next();
            id++;
            eleBrand.addAttribute("id",id+"");
        }
        saveXml("phoneinfo.xml");
    }
    
    //显示手机信息
    public void showPhoneInfo(){
        //获取根节点
        Element element = document.getRootElement();
        Iterator brand = element.elementIterator();
        while(brand.hasNext()){
            Element eleBrand = (Element)brand.next();
            //根据name属性获取对应的值的名字
            System.out.println(eleBrand.attributeValue("name"));
            //获取type节点
            Iterator type = eleBrand.elementIterator();
            //遍历所有type节点
            while(type.hasNext()){
                Element eleType = (Element)type.next();
                System.out.println("	"+eleType.attributeValue("name"));
            }
        }
    }

    //保存信息到xml
    public void saveXml(String path){
        //格式化
        OutputFormat format = OutputFormat.createPrettyPrint();
        //指定字符编码格式
        format.setEncoding("GBK");
        XMLWriter writer = null;
        //将文件按照指定格式输出到指定路径中
        try {
            writer = new XMLWriter(new OutputStreamWriter(new FileOutputStream(path)),format);
            writer.write(document);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }finally{
            try {
                //关闭服务
                writer.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

}

• 用dom4j解析xml文件并执行增删改查操作
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