使用dom4j和XPath解析XML之例子一

包括三个文件：studentInfo.xml(待解析的xml文件), Dom4jReadExmple.java(解析的主要类), TestDom4jReadExmple.java(测试解析的结果) （由于使用csdn blog自带的代码粘贴工具会朝里加入一些"..."字符，虽然利于查看，但是不利于把代码copy出来运行，而亲自运行代码对程序员来说是很重要的，故没有使用csdn blog自带的代码粘贴工具来插入代码，而是用着用直白的方式）：

studentInfo.xml

<?xml version="1.0" encoding="gb2312"?>
<students>
    <student age="25">
        <name>崔卫兵</name>
        <college>PC学院</college>
        <telephone>62354666</telephone>
        <notes>男,1982年生,硕士，现就读于北京邮电大学</notes>
    </student>
    <student>
        <name>cwb</name>
        <college leader="leader1">PC学院</college>
        <telephone>62358888</telephone>
        <notes>男,1987年生,硕士，现就读于中国农业大学</notes>
    </student>
    <student age="45">
        <name>xxxxx</name>
        <college leader="">xxx学院</college>
        <telephone>66666666</telephone>
        <notes>注视中，注释中</notes>
    </student>
    <student age="">
        <name>yyyyyy</name>
        <college leader="学院领导">yyyy学院</college>
        <telephone>88888888</telephone>
        <notes>注视中111，注释中222</notes>
    </student>
</students>

Dom4jReadExmple.java

package dom4jExample.read;

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

import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
/**
* 利用dom4j与XPath进行XML编程
* @author cuiweibing
* @since 2007.8.10
*/
public class Dom4jReadExmple {

/**
* 利用XPath操作XML文件，打印指定节点或者属性的值
* @param filename String 待操作的XML文件（相对路径或者绝对路径）
*/
public void printSelectedNodeValue(String filename){
  try {
   SAXReader saxReader = new SAXReader();
   Document document = saxReader.read(new File(filename));
   //打印所有student节点的属性age值，如果有的话
   List list = document.selectNodes("/students/student/@age");
   Iterator iter = list.iterator();
   while (iter.hasNext()) {
    Attribute attribute = (Attribute) iter.next();
    System.out.println("/students/student/@age："+attribute.getValue());
   }
      //打印所有college节点值，如果有的话
   list = document.selectNodes("/students/student");
   iter = list.iterator();
   while (iter.hasNext()) {
     Element bookElement = (Element) iter.next();
     Iterator iterator = bookElement.elementIterator("college");
     while (iterator.hasNext()) {
      Element titleElement = (Element) iterator.next();
      System.out.println("/students/student/college："+titleElement.getText());
     }
   }
   //测试节点的一些方法
   list = document.selectNodes("//telephone");
   iter = list.iterator();
   while (iter.hasNext()) {
     Element titleElement = (Element) iter.next();
     System.out.print("//telephone：getName:"+titleElement.getName());
     System.out.print(" ##getNodeType:"+titleElement.getNodeType());
     System.out.print(" ##getTextTrim:"+titleElement.getTextTrim());
     System.out.print(" ##getNamespaceURI:"+titleElement.getNamespaceURI());
     System.out.print(" ##getNodeTypeName:"+titleElement.getNodeTypeName());
     System.out.print(" ##getQualifiedName:"+titleElement.getQualifiedName());
     System.out.print(" ##getUniquePath:"+titleElement.getUniquePath());
     System.out.println(" ##getPath:"+titleElement.getPath());
   }
   //打印所有name节点值，如果有的话，与上面college的取法不一样
   list = document.selectNodes("/students/student/name");
   iter = list.iterator();
   while (iter.hasNext()) {
    Element titleElement = (Element) iter.next();
    System.out.println("/students/student/name："+titleElement.getText());
  }
  } catch (Exception ex) {
   ex.printStackTrace();
  }
}
}

TestDom4jReadExmple.java

package dom4jExample.read;

/**
* 测试Dom4jReadExmple解析的情况
* @author cuiweibing
* @since 2007.8.10
*/
public class TestDom4jReadExmple {
public static void main(String[] args) {
     try{
       Dom4jReadExmple drb=new Dom4jReadExmple();
       //利用XPath操作XML文件，打印想要的属性值
       drb.printSelectedNodeValue("studentInfo.xml");
     }catch(Exception ex){
       ex.printStackTrace();
     }
   }
}

运行结果

/students/student/@age：25
/students/student/@age：45
/students/student/@age：
/students/student/college：PC学院
/students/student/college：PC学院
/students/student/college：xxx学院
/students/student/college：yyyy学院
//telephone：getName:telephone ##getNodeType:1 ##getTextTrim:62354666 ##getNamespaceURI: ##getNodeTypeName:Element ##getQualifiedName:telephone ##getUniquePath:/students/student[1]/telephone ##getPath:/students/student/telephone
//telephone：getName:telephone ##getNodeType:1 ##getTextTrim:62358888 ##getNamespaceURI: ##getNodeTypeName:Element ##getQualifiedName:telephone ##getUniquePath:/students/student[2]/telephone ##getPath:/students/student/telephone
//telephone：getName:telephone ##getNodeType:1 ##getTextTrim:66666666 ##getNamespaceURI: ##getNodeTypeName:Element ##getQualifiedName:telephone ##getUniquePath:/students/student[3]/telephone ##getPath:/students/student/telephone
//telephone：getName:telephone ##getNodeType:1 ##getTextTrim:88888888 ##getNamespaceURI: ##getNodeTypeName:Element ##getQualifiedName:telephone ##getUniquePath:/students/student[4]/telephone ##getPath:/students/student/telephone
/students/student/name：崔卫兵
/students/student/name：cwb
/students/student/name：xxxxx
/students/student/name：yyyyyy

使用dom4j和XPath解析XML之例子一

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