Dom4j递归遍历XML所有元素

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.

* User: leizhimin

* Date: 2008-4-14 14:02:12

* Note: Java递归遍历XML所有元素
*/
public class XmlTest {

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

     //要测试的xml对象
     private static String srcXml = "\n" +
             "\n" +
             "    \n" +
             "        某人\n" +
             "                    \n" +
             "            \n" +
             "                10002\n" +
             "                西安市太白路\n" +
             "            \n" +
             "            \n" +
             "                10002\n" +
             "                空ID节点啊\n" +
             "            \n" +
             "            \n" +
             "                10002\n" +
             "                空ID节点啊\n" +
             "            \n" +
             "\t\t\t\n" +
             "\t\t\t\t\n" +
             "                西安市太白路2\n" +
             "            \n" +
             "\t\t\n" +
             "    \n" +
             "    \n" +
             "        ASDF\n" +
             "    \n" +
             "";

     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 elemList) {
        StringBuffer sb = new StringBuffer();
         for (Iterator 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。