public class XPathTest {

public void xpath(String xpathExp) {

String file="C:/Program Files/eclipse-workspace/xml/src/teaching-plan-schema.xml";

SAXReader reader=new SAXReader();

try {

Document document=reader.read(file);

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

for(Node node:nodes) {

Element plan=(Element)node;

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

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

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

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

}

} catch (DocumentException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} 

}

public static void main(String[] args) {

// TODO Auto-generated method stub

    XPathTest test=new XPathTest();

  //  test.xpath("//course");

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

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

   // test.xpath("//course[@id=2]");

    //test.xpath("//course[position()<3]");

    test.xpath("//@id");

}

}

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

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

<course id="1">

<course-name>大学英语</course-name>

<class-hour>36</class-hour>

<exam-form>考试</exam-form>

</course>

<course id="2">

<course-name>高等数学</course-name>

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

<exam-form>考试</exam-form>

</course>

<course id="3">

<course-name>计算机应用基础</course-name>

<class-hour>100</class-hour>

<exam-form>上机考试</exam-form>

</course>

<course id="4">

<course-name>体育课</course-name>

<class-hour>60</class-hour>

<exam-form>跑步测验</exam-form>

</course>

</teaching-plan>