使用java解析XML文件的步骤

以前的时候，也解析过，今天又拿出来解析就让忘记怎么解析了，后来在网上查还有自己想，终于解析出来了，下面就是原XML文件：
accp.xml

<?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>

还需要一个dtd文件accp.dtd：

<!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)>

最后就是解析的代码了：

//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();
		}
		
	}

最后看一下运行结果：