使用java解析XML文件的步骤

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE accp SYSTEM "accp.dtd">
<?xml-stylesheet type="text/css" href="accp.css"?>
<accp>
  <teachers>
    <teacher >
      <name>刘老师</name>
      <age>30</age>
      <degree>硕士</degree>
      <position>Java</position>   
    </teacher>
    <teacher>
      <name>李老师</name>
      <age>28</age>
      <degree>本科</degree>
      <position>.Net</position>   
    </teacher>
  </teachers>
  <students>
    <student>
      <name>高胜寒</name>
      <age>21</age>     
      <grade>Y2</grade>
      <school>北京中心</school>
    </student>
    <student>
      <name>信达雅</name>
      <age>19</age>
      <grade>S2</grade>
      <school>天津中心</school>
    </student>
  </students>
</accp>

<!ELEMENT accp (teachers,students)>
<!ELEMENT teachers (teacher*)>
<!ELEMENT students (student*)>
<!ELEMENT teacher (name,age,degree,position)>
<!ELEMENT student (name,age,grade,school)>
<!ELEMENT name (#PCDATA)>
<!ELEMENT age (#PCDATA)>
<!ELEMENT degree (#PCDATA)>
<!ELEMENT position (#PCDATA)>
<!ELEMENT grade (#PCDATA)>
<!ELEMENT school (#PCDATA)>

//解析xml文件
  public static void Test1(){
     DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
    //从DOM工厂获得DOM解析器
    try {
      DocumentBuilder db = dbf.newDocumentBuilder();
      //解析文档，得到一个dom树
      Document doc = db.parse("accp.xml");
      //得到所有的teacher节点
      NodeList teaList = doc.getElementsByTagName("teacher");
      System.out.println("xml里面共有"+teaList.getLength()+"个老师信息！");
      //循环老师信息
      for (int i = 0; i < teaList.getLength(); i++) {
        Node teacher = teaList.item(i);
        //获取第i个老师的信息的id值并输出
        /*Element element = (Element)teacher;
        String id = element.getAttribute("id");
        System.out.println("id:"+id);*/
        //获取第i个老师元素的所有子元素的名称和值并输出
        for(Node node=teacher.getFirstChild();node!=null;node =node.getNextSibling() ){
          if(node.getNodeType()==Node.ELEMENT_NODE){
            String value = node.getFirstChild().getNodeValue();
            System.out.print("name:"+value+"\t");
          }
        }
        System.out.println();
      }
    } catch (ParserConfigurationException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    } catch (SAXException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
    
  }