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：

 1 package com.test;
 2 
 3 import java.io.File;
 4 import java.util.ArrayList;
 5 import java.util.List;
 6 import javax.xml.parsers.DocumentBuilder;
 7 import javax.xml.parsers.DocumentBuilderFactory;
 8 import org.w3c.dom.Document;
 9 import org.w3c.dom.Element;
10 import org.w3c.dom.Node;
11 import org.w3c.dom.NodeList;
12 
13 public class DomXML {
14     
15     public static void main(String[] args) {
16         try {
17             File file = new File("e:/People.xml");  
18             DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();   
19             DocumentBuilder builder = factory.newDocumentBuilder();   
20             Document document = builder.parse(file);   
21             Element element = document.getDocumentElement();
22             
23             List<People> peopleList = new ArrayList<People>();
24             NodeList peopleNodes = element.getElementsByTagName("People"); 
25             for(int i=0;i<peopleNodes.getLength();i++){   
26                 People people = new People();
27                 Element peopleElement = (Element) peopleNodes.item(i);
28                 people.setId(peopleElement.getAttribute("id"));
29                 NodeList childPeopleNodes = peopleElement.getChildNodes();
30                 for(int j=0;j<childPeopleNodes.getLength();j++){
31                     //DOM解析时候注意子节点前面的空格也会被解析
32                     if(childPeopleNodes.item(j) instanceof Element){
33                         Element childPeopleElement = (Element) childPeopleNodes.item(j);
34                         if(childPeopleElement.getNodeType()==Node.ELEMENT_NODE){  
35                             if(childPeopleElement.getNodeName().equals("Name")){
36                                 people.setEnglishName(childPeopleElement.getAttribute("en"));
37                                 people.setName(childPeopleElement.getTextContent());
38                             }
39                             else if(childPeopleElement.getNodeName().equals("Age")){
40                                 people.setAge(childPeopleElement.getTextContent());    
41                             }
42                         }
43                     }
44                 }
45                 peopleList.add(people);
46             }
47             
48             for(People people : peopleList){
49                 System.out.println(people.getId()+"	"+people.getName()+"	"+people.getEnglishName()+"	"+people.getAge());
50             }
51             
52         } catch (Exception e) {
53             // TODO 自动生成的 catch 块
54             e.printStackTrace();
55         } 
56         
57         
58     }
59 }

People对象:

 1 package com.test;
 2 
 3 public class People {
 4     private String id;
 5     private String name;
 6     private String englishName;
 7     private String age;
 8     public String getId() {
 9         return id;
10     }
11     public void setId(String id) {
12         this.id = id;
13     }
14     public String getName() {
15         return name;
16     }
17     public void setName(String name) {
18         this.name = name;
19     }
20     public String getEnglishName() {
21         return englishName;
22     }
23     public void setEnglishName(String englishName) {
24         this.englishName = englishName;
25     }
26     public String getAge() {
27         return age;
28     }
29     public void setAge(String age) {
30         this.age = age;
31     }
32     
33 }

xml：

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <PeopleList>
 3     <People id="1">
 4         <Name en='zhangsan'>张三</Name>
 5         <Age>20</Age>
 6     </People>
 7     <People id="2">
 8         <Name en='lisi'>李四</Name>
 9         <Age>30</Age>
10     </People>
11 </PeopleList>