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
  1 xml文件:
  2 <?xml version="1.0" encoding="GBK"?>
  3 
  4 <phoneinfo> 
  5   <brand name="小米" id="1"> 
  6     <type name="MI5"/>  
  7     <type name="NOTE"/>  
  8     <type name="MI5S"/> 
  9   </brand>  
 10   <brand name="华为" id="2"> 
 11     <type name="荣耀8"/>  
 12     <type name="荣耀8plus"/> 
 13   </brand>  
 14   <brand name="苹果" id="3">
 15     <type name="iphone7"/>
 16     <type1 name="iphone6"/>
 17   </brand>
 18 </phoneinfo>
 19 
 20 
 21 用dom4j解析xml文件
 22 package com.hfxt;
 23 
 24 import java.io.File;
 25 import java.io.FileNotFoundException;
 26 import java.io.FileOutputStream;
 27 import java.io.IOException;
 28 import java.io.OutputStreamWriter;
 29 import java.util.Iterator;
 30 import org.dom4j.Document;
 31 import org.dom4j.DocumentException;
 32 import org.dom4j.Element;
 33 import org.dom4j.io.OutputFormat;
 34 import org.dom4j.io.SAXReader;
 35 import org.dom4j.io.XMLWriter;
 36 
 37 //dom4j解析xml并且执行(增、删、改、查)操作
 38 public class dom4jXmlDemo {
 39 
 40     private Document document;
 41     
 42     public static void main(String[] args){
 43         dom4jXmlDemo domXml = new dom4jXmlDemo();
 44         domXml.getDom();
 45         domXml.addPhoneInfo();
 46         domXml.updatePhoneInfo();
 47         //domXml.deletePhoneInfo();
 48         domXml.showPhoneInfo();
 49 
 50     }
 51     
 52     //获取DOM树
 53     public void getDom(){
 54         SAXReader reader = new SAXReader();
 55         try {
 56             document = reader.read(new File("phoneinfo.xml"));
 57         } catch (DocumentException e) {
 58             e.printStackTrace();
 59         }
 60     }
 61     
 62     //增加手机信息
 63     public void addPhoneInfo(){
 64         //获取根节点元素
 65         Element element = document.getRootElement();
 66         //添加brand节点
 67         Element brand = element.addElement("brand");
 68         //为brand添加属性并且赋值
 69         brand.addAttribute("name","苹果");
 70         //添加type节点
 71         Element type = brand.addElement("type");
 72         Element type1 = brand.addElement("type1");
 73         //为type节点添加name属性并且赋值
 74         type.addAttribute("name","iphone7");
 75         type1.addAttribute("name","iphone6");
 76         saveXml("phoneinfo.xml");
 77     }
 78     
 79     //删除手机信息
 80     public void deletePhoneInfo(){
 81         //获取根节点
 82         Element element = document.getRootElement();
 83         Iterator brand = element.elementIterator();
 84         //遍历获取每个节点信息
 85         while(brand.hasNext()){
 86             Element eleBrand = (Element)brand.next();
 87             //删除name为苹果的brand
 88             if(eleBrand.attributeValue("name").equals("苹果")){
 89                 eleBrand.getParent().remove(eleBrand);
 90             }
 91         }
 92         //保存信息
 93         saveXml("phoneinfo.xml");
 94     }
 95 
 96     //修改手机信息
 97     public void updatePhoneInfo(){
 98         //获取手机信息
 99         Element element = document.getRootElement();
100         Iterator brand = element.elementIterator();
101         int id = 0;
102         while(brand.hasNext()){
103             Element eleBrand = (Element)brand.next();
104             id++;
105             eleBrand.addAttribute("id",id+"");
106         }
107         saveXml("phoneinfo.xml");
108     }
109     
110     //显示手机信息
111     public void showPhoneInfo(){
112         //获取根节点
113         Element element = document.getRootElement();
114         Iterator brand = element.elementIterator();
115         while(brand.hasNext()){
116             Element eleBrand = (Element)brand.next();
117             //根据name属性获取对应的值的名字
118             System.out.println(eleBrand.attributeValue("name"));
119             //获取type节点
120             Iterator type = eleBrand.elementIterator();
121             //遍历所有type节点
122             while(type.hasNext()){
123                 Element eleType = (Element)type.next();
124                 System.out.println("	"+eleType.attributeValue("name"));
125             }
126         }
127     }
128 
129     //保存信息到xml
130     public void saveXml(String path){
131         //格式化
132         OutputFormat format = OutputFormat.createPrettyPrint();
133         //指定字符编码格式
134         format.setEncoding("GBK");
135         XMLWriter writer = null;
136         //将文件按照指定格式输出到指定路径中
137         try {
138             writer = new XMLWriter(new OutputStreamWriter(new FileOutputStream(path)),format);
139             writer.write(document);
140         } catch (FileNotFoundException e) {
141             e.printStackTrace();
142         } catch (IOException e) {
143             e.printStackTrace();
144         }finally{
145             try {
146                 //关闭服务
147                 writer.close();
148             } catch (IOException e) {
149                 e.printStackTrace();
150             }
151         }
152     }
153 
154 }