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()+"	"+people.getName()+"	"+people.getEnglishName()+"	"+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>