利用dom4j进行XML解析实例

Java代码如下：

package javaForXML;

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

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

/**
 * 利用dom4j进行XML编程
 *
 * @author cuiweibing
 * @since 2007.8.10
 */
public class PraseXMLTest3 {
    /**
     * 遍历整个XML文件，获取所有节点的值与其属性的值，并放入HashMap中
     *
     * @param filename
     *            String 待遍历的XML文件（相对路径或者绝对路径）
     * @param hm
     *            HashMap 存放遍历结果，格式：<nodename,nodevalue>或者<nodename+attrname,attrvalue>
     */

    public Map<String,String> iterateWholeXML(String filename, HashMap<String, String> hm) {
        SAXReader saxReader = new SAXReader();
        try {
            Document document = saxReader.read(new File(filename));
            Element root = document.getRootElement();
            // 用于记录学生编号的变量
            int num = -1;
            // 遍历根结点（students）的所有孩子节点（肯定是student节点）
            for (Iterator iter = root.elementIterator(); iter.hasNext();) {
                Element element = (Element) iter.next();
                num++;
                // 获取person节点的age属性的值
                Attribute ageAttr = element.attribute("age");
                if (ageAttr != null) {
                    String age = ageAttr.getValue();
                    if (age != null && !age.equals("")) {
                        hm.put(element.getName() + "-" + ageAttr.getName()+ num, age);
                    } else {
                        hm.put(element.getName() + "-" + ageAttr.getName()+ num, "20");
                    }
                } else {
                    hm.put(element.getName() + "-age" + num, "20");
                }
                // 遍历student结点的所有孩子节点（即name，college，telphone，notes），并进行处理
                for (Iterator iterInner = element.elementIterator(); iterInner
                        .hasNext();) {
                    Element elementInner = (Element) iterInner.next();
                    if (elementInner.getName().equals("college")) {
                        hm.put(elementInner.getName() + num, elementInner.getText());
                        // 获取college节点的leader属性的值
                        Attribute leaderAttr = elementInner.attribute("leader");
                        if (leaderAttr != null) {
                            String leader = leaderAttr.getValue();
                            if (leader != null && !leader.equals("")) {
                                hm.put(elementInner.getName() + "-"+ leaderAttr.getName() + num, leader);
                            } else {
                                hm.put(elementInner.getName() + "-"+ leaderAttr.getName() + num, "leader");
                            }
                        } else {
                            hm.put(elementInner.getName() + "-leader" + num,"leader");
                        }
                    } else {
                        hm.put(elementInner.getName() + num, elementInner.getText());
                    }
                }
            }
            return hm;
        } catch (DocumentException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return hm;
    }
   
    public static void main(String[] args) throws DocumentException{
     String filename="d:\zhang.xml";
     HashMap <String,String>map = new HashMap<String, String>();
     HashMap <String,String>map1 = (HashMap<String, String>) new PraseXMLTest3().iterateWholeXML(filename, map);
     for(String ss:map1.keySet()){
      System.out.println(ss+":"+map1.get(ss));
     }
    }
}

所解析的xml文件如下：

 

<?xml version="1.0" encoding="gb2312"?>
<students>
    <student age="25"><!--如果没有age属性，默认的为20-->
        <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="学院领导">PC学院</college><!--如果没有leader属性，默认的为leader-->
        <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>lxx</name>
        <college>yyyy学院</college>
        <telephone>88888888</telephone>
        <notes>注视中111，注释中222</notes>
    </student>
</students>