Dom4j递归遍历XML所有元素 tuijian_1.gif
2008-04-15 14:25:58
　标签： Dom4j 遍历 递归 XML　　　 [ 推送到技术圈]

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Java递归遍历XML所有元素
 
做一个递归遍历XML的例子，为更为复杂的解析工作做基础。
 
 
目标：遍历所有的元素节点，并且取出来其中的值，结果打印到控制台。
 
源代码如下：
本程序依赖DOM4j包。
 
import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.DocumentException;
import org.dom4j.Element;

import java.util.*;

/**
* Created by IntelliJ IDEA.<br>
* <b>User</b>: leizhimin<br>
* <b>Date</b>: 2008-4-14 14:02:12<br>
* <b>Note</b>: Java递归遍历XML所有元素
*/
public class XmlTest {

//    private static Map<String, String> xmlmap = new HashMap<String, String>();
     //存储xml元素信息的容器
     private static List<Leaf> elemList = new ArrayList<Leaf>();

     //要测试的xml对象
     private static String srcXml = "<?xml version=\"1.0\" encoding=\"GBK\"?>\n" +
             "<doc>\n" +
             "    <person>\n" +
             "        <name>某人</name>\n" +
             "        <adds>            \n" +
             "            <add ID=\"10002\">\n" +
             "                <BS>10002</BS>\n" +
             "                <note>西安市太白路</note>\n" +
             "            </add>\n" +
             "            <add ID=\"\">\n" +
             "                <BS>10002</BS>\n" +
             "                <note>空ID节点啊</note>\n" +
             "            </add>\n" +
             "            <add>\n" +
             "                <BS>10002</BS>\n" +
             "                <note>空ID节点啊</note>\n" +
             "            </add>\n" +
             "\t\t\t<add ID=\"10001\">\n" +
             "\t\t\t\t<BS xmlns=\"10001\"/>\n" +
             "                <note>西安市太白路2</note>\n" +
             "            </add>\n" +
             "\t\t</adds>\n" +
             "    </person>\n" +
             "    <other>\n" +
             "        <name ID=\"HEHE\">ASDF</name>\n" +
             "    </other>\n" +
             "</doc>";

     public static void main(String args[]) throws DocumentException {
        XmlTest test = new XmlTest();
        Element root = test.getRootElement();
        test.getElementList(root);
        String x = test.getListString(elemList);

        System.out.println( "-----------原xml内容------------");
        System.out.println(srcXml);
        System.out.println( "-----------解析结果------------");
        System.out.println(x);

    }

     /**
     * 获取根元素
     *
     * @return
     * @throws DocumentException
     */
     public Element getRootElement() throws DocumentException {
        Document srcdoc = DocumentHelper.parseText(srcXml);
        Element elem = srcdoc.getRootElement();
         return elem;
    }

     /**
     * 递归遍历方法
     *
     * @param element
     */
     public void getElementList(Element element) {
        List elements = element.elements();
         if (elements.size() == 0) {
             //没有子元素
            String xpath = element.getPath();
            String value = element.getTextTrim();
            elemList.add( new Leaf(xpath, value));
        } else {
             //有子元素
             for (Iterator it = elements.iterator(); it.hasNext();) {
                Element elem = (Element) it.next();
                 //递归遍历
                getElementList(elem);
            }
        }
    }

     public String getListString(List<Leaf> elemList) {
        StringBuffer sb = new StringBuffer();
         for (Iterator<Leaf> it = elemList.iterator(); it.hasNext();) {
            Leaf leaf = it.next();
            sb.append(leaf.getXpath()).append( " = ").append(leaf.getValue()).append( "\n");
        }
         return sb.toString();
    }
}

/**
* xml节点数据结构
*/
class Leaf {
     private String xpath;         //
     private String value;

     public Leaf(String xpath, String value) {
         this.xpath = xpath;
         this.value = value;
    }

     public String getXpath() {
         return xpath;
    }

     public void setXpath(String xpath) {
         this.xpath = xpath;
    }

     public String getValue() {
         return value;
    }

     public void setValue(String value) {
         this.value = value;
    }
}
 
运行结果：
 
-----------原xml内容------------
<? xml version ="1.0" encoding ="GBK" ?>
< doc >
     < person >
         < name >某人 </ name >
         < adds >            
             < add ID ="10002" >
                 < BS >10002 </ BS >
                 < note >西安市太白路 </ note >
             </ add >
             < add ID="" >
                 < BS >10002 </ BS >
                 < note >空ID节点啊 </ note >
             </ add >
             < add >
                 < BS >10002 </ BS >
                 < note >空ID节点啊 </ note >
             </ add >
       < add ID ="10001" >
     < BS xmlns ="10001" />
                 < note >西安市太白路2 </ note >
             </ add >
   </ adds >
     </ person >
     < other >
         < name ID ="HEHE" >ASDF </ name >
     </ other >
</ doc >
-----------解析结果------------
/doc/person/name = 某人
/doc/person/adds/add/BS = 10002
/doc/person/adds/add/note = 西安市太白路
/doc/person/adds/add/BS = 10002
/doc/person/adds/add/note = 空ID节点啊
/doc/person/adds/add/BS = 10002
/doc/person/adds/add/note = 空ID节点啊
/doc/person/adds/add/*[name()='BS'] =  
/doc/person/adds/add/note = 西安市太白路2
/doc/other/name = ASDF


Process finished with exit code 0
 
可以发现，有很多xpath相同的值域。
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