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      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("\t"+eleType.attributeValue("name"));125             }126         }127     }128 129     //保存信息到xml130     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 }

 

• 用dom4j解析xml文件并执行增删改查操作
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