具体的XML内容
<?xml version="1.0" encoding="UTF-8"?>
<school><!-- 学校 -->
<class id="0001"> <!-- 班级信息 -->
<!-- 名称 -->
<name>一年一班</name>
<!--老师 -->
<teacher>
<teachertname>王老师</teachertname>
<teacheage>28</teacheage>
</teacher>
<!-- 学生 -->
<student>
<name>张三</name>
<studentage>6</studentage>
</student>
<student>
<name>李四</name>
<studentage>7</studentage>
</student>
</class>
<class id="0002"> <!-- 班级信息 -->
<!-- 名称 -->
<name>一年二班</name>
<!--老师 -->
<teacher>
<teachertname>王老师</teachertname>
<teacheage>28</teacheage>
</teacher>
<student>
<name>王五</name>
<studentage>8</studentage>
</student>
</class>
</school>

dom4j

dom4j解析加xpath读取节点