dom4j--XPath获取特定节点应用一例

1. xml文件如下：

   <?xml version="1.0" encoding="GBK"?>
   
   <chat> 
     <messages> 
       <from>[系统公告]</from>  
       <face/>  
       <to/>  
       <content>&lt;font color='gray'&gt;叶明坚同同学走进了聊天室！&lt;/font&gt;</content>  
       <sendTime>2010-8-21 13:02:17</sendTime>  
       <isPrivate>false</isPrivate> 
     </messages>  
     <messages> 
       <from>叶明坚同同学</from>  
       <face>正义凛然的</face>  
       <to>所有人</to>  
       <content>&lt;font color='&gt;哈哈，陈步青同同学终于解决了中文乱码问题啦￥%#@%&lt;/font&gt;</content>  
       <sendTime>2010-8-21 13:03:00</sendTime>  
       <isPrivate>false</isPrivate> 
     </messages>  
     <messages> 
       <from>[系统公告]</from>  
       <face/>  
       <to/>  
       <content>&lt;font color='gray'&gt;陈步青走进了聊天室！&lt;/font&gt;</content>  
       <sendTime>2010-8-21 13:05:54</sendTime>  
       <isPrivate>false</isPrivate> 
     </messages>  
     <messages> 
       <from>陈步青</from>  
       <face>微笑着</face>  
       <to>叶明坚同同学</to>  
       <content>&lt;font color='&gt;告诉你个秘密，我终于解决了那个烦人的中文乱码问题啦&lt;/font&gt;</content>  
       <sendTime>2010-8-21 13:06:40</sendTime>  
       <isPrivate>true</isPrivate> 
     </messages>  
     <messages> 
       <from>[系统公告]</from>  
       <face/>  
       <to/>  
       <content>&lt;font color='gray'&gt;小牛顿走进了聊天室！&lt;/font&gt;</content>  
       <sendTime>2010-8-21 21:29:25</sendTime>  
       <isPrivate>false</isPrivate> 
     </messages>  
     <messages> 
       <from>[系统公告]</from>  
       <face/>  
       <to/>  
       <content>&lt;font color='gray'&gt;陈步青走进了聊天室！&lt;/font&gt;</content>  
       <sendTime>2010-8-21 21:29:51</sendTime>  
       <isPrivate>false</isPrivate> 
     </messages>  
     <messages> 
       <from>[系统公告]</from>  
       <face/>  
       <to/>  
       <content>&lt;font color='gray'&gt;hak走进了聊天室！&lt;/font&gt;</content>  
       <sendTime>2010-8-21 21:31:40</sendTime>  
       <isPrivate>false</isPrivate> 
     </messages>  
     <messages> 
       <from>小牛顿</from>  
       <face>严肃的</face>  
       <to>所有人</to>  
       <content>&lt;font color='&gt;大家一起吹水。。。。&lt;/font&gt;</content>  
       <sendTime>2010-8-21 21:32:54</sendTime>  
       <isPrivate>false</isPrivate> 
     </messages>  
     <messages> 
       <from>[系统公告]</from>  
       <face/>  
       <to/>  
       <content>&lt;font color='gray'&gt;蔡泽鑫走进了聊天室！&lt;/font&gt;</content>  
       <sendTime>2010-8-21 22:40:05</sendTime>  
       <isPrivate>false</isPrivate> 
     </messages>  
   </chat>
   

    
2. java代码：

   package scau.netbeansTester;
   
   import java.util.Iterator;
   import java.util.List;
   
   import org.dom4j.Document;
   import org.dom4j.DocumentException;
   import org.dom4j.Element;
   import org.dom4j.Node;
   import org.dom4j.io.SAXReader;
   
   public class TestRootE {
   
   	/**
   	 * @param args
   	 * @throws DocumentException 
   	 */
   	public static void main(String[] args) throws DocumentException {
   		// TODO Auto-generated method stub
   		SAXReader reader = new SAXReader();
           Document document = null;       
           
           document = reader.read("TestRootE.xml");
           //获取指定目录下的所有<messages>节点
           List<Node> list = (List<Node>)document.selectNodes("//chat/messages");
           //依次取出每个<messages>节点
           for(Node n : list) {
   			Element messagesElement = (Element) n;
   			//取得每个<messages>节点下名为"sendTime"的节点
               String sendTime = messagesElement.element("sendTime").getText();
               p(sendTime);
   		}
           
   	}
   	public static void p(Object o ) {
   		System.out.println(o);
   	}
   
   }