Java中Dom解析XML

DOM将整个XML文件加载到内存中，并构建出节点树；应用程序可以通过遍历节点树的方式来解析XML文件中的各个节点、属性等信息；
这种方式便于对XML节点的添加修改等，而且解析也很方便，然后它比较耗费内存，解析速度也不快

sax解析: http://www.cnblogs.com/gavinYang/p/3505543.html  
dom4j解析: http://www.cnblogs.com/gavinYang/p/3505535.html
jdom解析: http://www.cnblogs.com/gavinYang/p/3505530.html

Java代码：

 package com.test;

 import java.io.File;
 import java.util.ArrayList;
 import java.util.List;
 import javax.xml.parsers.DocumentBuilder;
 import javax.xml.parsers.DocumentBuilderFactory;
 import org.w3c.dom.Document;
 import org.w3c.dom.Element;
 import org.w3c.dom.Node;
 import org.w3c.dom.NodeList;

 public class DomXML {

     public static void main(String[] args) {
         try {
             File file = new File("e:/People.xml");
             DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
             DocumentBuilder builder = factory.newDocumentBuilder();
             Document document = builder.parse(file);
             Element element = document.getDocumentElement();

             List<People> peopleList = new ArrayList<People>();
             NodeList peopleNodes = element.getElementsByTagName("People");
             for(int i=0;i<peopleNodes.getLength();i++){
                 People people = new People();
                 Element peopleElement = (Element) peopleNodes.item(i);
                 people.setId(peopleElement.getAttribute("id"));
                 NodeList childPeopleNodes = peopleElement.getChildNodes();
                 for(int j=0;j<childPeopleNodes.getLength();j++){
                     //DOM解析时候注意子节点前面的空格也会被解析
                     if(childPeopleNodes.item(j) instanceof Element){
                         Element childPeopleElement = (Element) childPeopleNodes.item(j);
                         if(childPeopleElement.getNodeType()==Node.ELEMENT_NODE){
                             if(childPeopleElement.getNodeName().equals("Name")){
                                 people.setEnglishName(childPeopleElement.getAttribute("en"));
                                 people.setName(childPeopleElement.getTextContent());
                             }
                             else if(childPeopleElement.getNodeName().equals("Age")){
                                 people.setAge(childPeopleElement.getTextContent());
                             }
                         }
                     }
                 }
                 peopleList.add(people);
             }

             for(People people : peopleList){
                 System.out.println(people.getId()+"\t"+people.getName()+"\t"+people.getEnglishName()+"\t"+people.getAge());
             }

         } catch (Exception e) {
             // TODO 自动生成的 catch 块
             e.printStackTrace();
         } 

     }
 }

People对象:

 package com.test;

 public class People {
     private String id;
     private String name;
     private String englishName;
     private String age;
     public String getId() {
         return id;
     }
     public void setId(String id) {
         this.id = id;
     }
     public String getName() {
         return name;
     }
     public void setName(String name) {
         this.name = name;
     }
     public String getEnglishName() {
         return englishName;
     }
     public void setEnglishName(String englishName) {
         this.englishName = englishName;
     }
     public String getAge() {
         return age;
     }
     public void setAge(String age) {
         this.age = age;
     }

 }

xml：

 <?xml version="1.0" encoding="UTF-8"?>
 <PeopleList>
     <People id="1">
         <Name en='zhangsan'>张三</Name>
         <Age>20</Age>
     </People>
     <People id="2">
         <Name en='lisi'>李四</Name>
         <Age>30</Age>
     </People>
 </PeopleList>