<?xml version="1.0" encoding="UTF-8"?>

<schema xmlns="http://www.w3.org/2001/XMLSchema">

<element name="teaching-plan">

<complexType>

<sequence>

<element name="course" minOccurs="1" maxOccurs="100">

<complexType>

<sequence>

<element name="course-name" type="string"></element>

<element name="class-hour" type="integer"></element>

<element name="exam-form" type="string"></element>

</sequence>

<attribute name="id" type="string" use="required"></attribute>

</complexType>

</element>

</sequence>

</complexType>

</element>

</schema>

<?xml version="1.0" encoding="UTF-8"?>

<!-- <!DOCTYPE teaching-plan SYSTEM "plan.dtd"> -->                      

<teaching-plan xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="plan.xsd">

<course id="001">

<course-name>大学英语</course-name>

<class-hour>34</class-hour>

<exam-form>考试</exam-form>

</course>

<course id="002">

<course-name>高等数学</course-name>

<class-hour>70</class-hour>

<exam-form>考试</exam-form>

</course>

<course id="003">

<course-name>计算机应用基础</course-name>

<class-hour>108</class-hour>

<exam-form>上机考试</exam-form>

</course>

</teaching-plan>

package lib;

import java.util.List;

import org.dom4j.Document;

import org.dom4j.DocumentException;

import org.dom4j.Element;

import org.dom4j.Node;

import org.dom4j.io.SAXReader;

public class XPathTestor {

public void xpath(String xpathExp) {

String file="C:/Users/Admin/eclipse-workspace/xml/src/plan.xml";

SAXReader reader=new SAXReader();

try {

Document document=reader.read(file);

List<Node> nodes=document.selectNodes(xpathExp);

for(Node node:nodes) {

Element element=(Element)node;

System.out.println(element.attributeValue("id"));

System.out.println(element.elementText("course-name"));

System.out.println(element.elementText("class-hour"));

System.out.println(element.elementText("exam-form"));

System.out.println("============================================");

}

} catch (DocumentException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

public static void main(String[] args) {

XPathTestor xpath=new XPathTestor();

System.out.println("获取所有课程信息");

//xpath.xpath("/teaching-plan/course");

xpath.xpath("//course");

System.out.println("查询课时小于50的课程信息");

xpath.xpath("//course[class-hour < 50]");

System.out.println("查询课程名为高等数学的课程信息");

xpath.xpath("//course[course-name='高等数学']");

System.out.println(" 查询属性id为001的课程信息");

//xpath.xpath("//course[1]");

xpath.xpath("//course[@id=001]");

System.out.println("查询前两条课程信息");

xpath.xpath("//course[1] | //course[2]");

//xpath.xpath("//course[position()<2]");

}

}