DOM4J_ElementHandler示例代码

Posted 2022-08-01 星河scorpion

DOM4J解析XML利用ElementHandler接口。重写onStart()和onEnd()两个方法。 
注意：要读取元素节点的内容，必须在onEnd()方法中，因为onStart()只解析到开始节点。 
1、解析：

SAXReader saxReader = new SAXReader();
//addHandler必须在read之前，否则无效。
saxReader.addHandler("/students/student/name", new NameHandler());
saxReader.read(new File("students.xml"));

2、addHandler（）;此方法可以设计访问的节点的路径。 
3、JAVA代码如下： 

import java.io.File;

import org.dom4j.*;
import org.dom4j.io.SAXReader;


public class ElementHandlerTest


    public static void main(String[] args)
    
        SAXReader saxReader = new SAXReader();
        saxReader.addHandler("/students/student", new StudentHandler());
        try
        
            saxReader.read(new File("students.xml"));
        
        catch (DocumentException e)
        
            // TODO Auto-generated catch block
            e.printStackTrace();
        
    

    private static class StudentHandler implements ElementHandler
    
        @Override
        public void onStart(ElementPath path)
        
            Element elt = path.getCurrent();
            System.out.println("Found student : "+elt.attributeValue("sn"));
            path.addHandler("name",new NameHandler());
            path.addHandler("age",new NameHandler());
        

        @Override
        public void onEnd(ElementPath path)
        
            path.removeHandler("name");
        

    

    private static class NameHandler implements ElementHandler
    

        @Override
        public void onStart(ElementPath path)//不要获取文本内容。
        
            System.out.println(path.getPath());
        

        @Override
        public void onEnd(ElementPath path)//读取文本内容
        
            Element elt = path.getCurrent();
            System.out.println(elt.getName()+" : "+elt.getText());

        


    

4、students.xml如下： 

<?xml version="1.0" encoding="gb2312"?>
<?xml-stylesheet type="text/xsl" href = "students.xsl"?>

<students>  
    <student sn="01">       
        <name>张三             
            <like>lili</like>       
        </name>     
        <age>18</age>   
    </student>    
    <student sn="02">       
        <name>李四</name>     
        <age>28</age>   
    </student>
</students>