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("\t"+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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