DOM4J_ElementHandler

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>

`