java中使用dom4j解析XML文件的方法教程

<?xml version="1.0" encoding="UTF-8"?>
<classes>
 <class name="ST01">
 <student id="10001">user1</student>
 <student id="10002">user2</student>
 <student id="10003">user3</student>
 </class>
 <class name="ST02">
 <student id="10004">user4</student>
 <student id="10005">user5</student>
 <student id="10006">user6</student>
 </class>
 <class name="ST03">
 <student id="10007">user7</student>
 <student id="10008">user8</student>
 <student id="10009">user9</student>
 </class>
 <class name="ST04">
 <student id="10010">user10</student>
 <student id="10011">user12</student>
 <student id="10012">user13</student>
 </class>
 <class name="ST05">
 <student id="10013">user14</student>
 <student id="10014">user15</student>
 <student id="10015">user16</student>
 </class>
</classes>

/**
 * @author hh
 */
public class XmlUtil {
 /**
 * 读取xml学生列表信息
 * @return
 */
 public List<Student> listStudent(){
 //创建SAXReader对象
 SAXReader reader=new SAXReader();
 Document document = null;
 try {
  //通过read方法读取一个文件 转换成Document对象
  document = reader.read(new File("/Users/mac/Documents/students.xml"));
 } catch (DocumentException e) {
  e.printStackTrace();
 }
 //获取根节点元素对象
 Element node = document.getRootElement();
 return elementMethod(node);
 }

 /**
 * 获取节点中的信息
 * @param node
 * @return
 */
 private List<Student> elementMethod(Element node){
 List<Student> list = new ArrayList<Student>();
 //获取所有class 节点
 List<Element> elementClass = node.elements("class");
 for (Element aClass : elementClass) {
  //获取所有student节点
  List<Element> elelmentStu=aClass.elements("student");
  for (Element element : elelmentStu) {
  //创建学生对象
  Student stu = new Student();
  //class节点里name的值
  stu.setSclazz(aClass.attribute("name").getValue());
  //student节点里ID的值
  stu.setSid(element.attribute("id").getValue());
  //student节点里的String值
  stu.setSname(element.getStringValue());

  list.add(stu);
  }
 }

 return list;
 }
}

/**
 * @author hh
 */
public class Student {
 private String sname;
 private String sid;
 private String sclazz;


 public String getSname() {
 return sname;
 }

 public void setSname(String sname) {
 this.sname = sname;
 }

 public String getSid() {
 return sid;
 }

 public void setSid(String sid) {
 this.sid = sid;
 }

 public String getSclazz() {
 return sclazz;
 }

 public void setSclazz(String sclazz) {
 this.sclazz = sclazz;
 }

 @Override
 public String toString() {
 return "Student{" +
  "sname='" + sname + '\'' +
  ", sid='" + sid + '\'' +
  ", sclazz='" + sclazz + '\'' +
  '}';
 }
}

public class StudentDaoTest {
 @Test
 public void testlistStudent(){
 List<Student> list = new XmlUtil().listStudent();
 for (Student student : list) {
  System.out.println(student);
 }
 }
}