使用dom4j的xpath解析xlm文件

package com.njusc.xmlTest;

import java.io.File;
import java.util.Iterator;
import java.util.List;

import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.Node;
import org.dom4j.io.SAXReader;

public class TestDom4jReadExmple
{
    /*
     * 创建一个测试xml      bicashy.xml
     * 
    <?xml version="1.0" encoding="UTF-8"?>
    <students>
        <student age="25">
            <name>云天河</name>
            <college>野外学院</college>
            <telephone>62354666</telephone>
            <notes>一个从小在山野里长大的少年，双亲早亡，小小年纪就开始了自立的生活。</notes>
        </student>

        <student>
            <name>韩菱纱</name>
            <college leader="侠盗高飞">盗墓学院</college>
            <telephone>62358888</telephone>
            <notes>女,出身于盗墓世家，却对辨识墓穴位置、破解诡异机关、地脉风水之学颇有研究。</notes>
        </student>
        <student age="18">
            <name>柳梦璃</name>
            <college leader="">名门贵族</college>
            <telephone>66666666</telephone>
            <notes>梦璃是一个满怀柔情的女孩子，但她最温柔的一面只会留给自己喜欢的人。</notes>
        </student>
        <student age="18">
            <name>慕容紫英</name>
            <college>昆仑学院</college>
            <telephone>88888888</telephone>
            <notes>外冷内热、嫉恶如仇的热血青年，不但剑术超群，铸剑之术更是厉害。</notes>
        </student>
    </students>
    */

    
    public static void main(String[] args) {
        try{
          //获取解析完后的解析信息
          //利用XPath操作XML文件，获取想要的属性值

          
          SAXReader saxReader = new SAXReader();
          Document document = saxReader.read(new File("d:/bicashy.xml"));
          
          /*直接定位到student name为云天河的节点的age属性*/
          List list = document.selectNodes("/students/student[name=\"云天河\"]/@age");
          Iterator iter = list.iterator();
          if (iter.hasNext()) {
           Attribute attribute = (Attribute) iter.next();
           System.out.println("云天河-"+attribute.getName()+":"+attribute.getValue());
          }
          
          
          /*获取学生姓名为"韩菱纱"所在的学院名称*/
          list = document.selectNodes("/students/student[name=\"韩菱纱\"]/college");
          iter = list.iterator();
          if (iter.hasNext()) {
            Element element = (Element) iter.next();
            String name = element.getName();
            String value = element.getText();
            System.out.println("韩菱纱-"+name+":"+value);
          }
          
          
          /*获取学生姓名为"韩菱纱"所在学院的师傅*/
          list = document.selectNodes("/students/student[name=\"韩菱纱\"]/college/@leader");
          iter = list.iterator();
          if (iter.hasNext()) {
           Attribute attribute = (Attribute) iter.next();
           System.out.println("韩菱纱-college-"+attribute.getName()+":"+attribute.getValue());
          }
          
          /*获取学生姓名为"柳梦璃"的简介*/
          list = document.selectNodes("/students/student[name=\"柳梦璃\"]/notes");
          iter = list.iterator();
          if (iter.hasNext()) {
              Element element = (Element) iter.next();
              System.out.println("柳梦-"+element.getName()+":"+element.getText());
          }
          
          /*获取年龄为"18"的学生的姓名、学院和电话号码*/
          list = document.selectNodes("/students/student[@age='18']");
          for(Object o:list){  
              Node  n = (Node ) o; 
              Element name = (Element)n.selectObject("name");
              Element college = (Element)n.selectObject("college");
              Element telephone = (Element)n.selectObject("telephone");
              System.out.println(name.getText()+"__ "+"college:"+college.getText()
                      +"  telephone:"+telephone.getText());
           }
          
          /*获取年龄为"18",college的leader为空的学院名称*/
          list = document.selectNodes("/students/student[@age='18']/college[@leader='']");
          iter = list.iterator();
          if (iter.hasNext()) {
              Element element = (Element) iter.next();
              System.out.println(""+element.getName()+":"+element.getText());
          }
          
          
          /*获取年龄为"18"姓名为"柳梦璃"、姓名、学院和电话号码*/
          list = document.selectNodes("/students/student[@age='18'][name='柳梦璃']");
          for(Object o:list){  
              Node  n = (Node ) o; 
              Element name = (Element)n.selectObject("name");
              Element college = (Element)n.selectObject("college");
              Element telephone = (Element)n.selectObject("telephone");
              System.out.println(name.getText()+"__ "+"college:"+college.getText()
                      +"  telephone:"+telephone.getText());
           }
          
          /*获取年龄大于18的人的 姓名、学院和电话号码*/
          list = document.selectNodes("/students/student[@age>18]");
          for(Object o:list){  
              Node  n = (Node ) o; 
              Element name = (Element)n.selectObject("name");
              Element college = (Element)n.selectObject("college");
              Element telephone = (Element)n.selectObject("telephone");
              System.out.println(name.getText()+"__   "+"college:"+college.getText()
                      +"  telephone:"+telephone.getText());
           }
          
          /*获取student所有的人的 姓名、学院和电话号码  */
          //注  /students/student  可简写为//student根节点可以省去
          list = document.selectNodes("//student");  
          for(Object o:list){  
              Node  n = (Node ) o; 
              Element name = (Element)n.selectObject("name");
              Element college = (Element)n.selectObject("college");
              Element telephone = (Element)n.selectObject("telephone");
              System.out.println(name.getText()+"__   "+"college:"+college.getText()
                      +"  telephone:"+telephone.getText());
           }
         
        }catch(Exception ex){
          ex.printStackTrace();
        }
      }
}

完成上述操作需要两个jar包