dom4j学习笔记(二)

dom4j 有一个很大的优点,可以支持xPath表达式.

下面,以上篇文章中的,ibm.xml为例,总结一下,修改ibm.xml.

ibm.xml代码如下:

1. <?xml version="1.0" encoding="UTF-8"?> 
2. <catalog> 
3. <!--An XML Catalog--> 
4. <?target instruction?>
5.   <journal title="XML Zone"  publisher="IBM developerWorks"> 
6.         <article level="Intermediate" date="December-2001">
7.             <title>Java configuration with XML Schema</title> 
8.             <author> 
9.                 <firstname>Marcello</firstname> 
10.                 <lastname>Vitaletti</lastname> 
11.             </author>
12.         </article>
13.   </journal> 
14. </catalog>

演示代码如下:

1. package org.james.dom4j;
3. import java.io.File;
4. import java.io.FileWriter;
5. import java.io.IOException;
6. import java.io.InputStream;
7. import java.util.Iterator;
8. import java.util.List;
10. import org.dom4j.Attribute;
11. import org.dom4j.Document;
12. import org.dom4j.DocumentException;
13. import org.dom4j.Element;
14. import org.dom4j.io.SAXReader;
15. import org.dom4j.io.XMLWriter;
17. public class UpdateXML {
19.     /**
20.      * @param args
21.      */
22.     @SuppressWarnings("unchecked")
23.     public static void main(String[] args) {
24.         SAXReader saxReader = new SAXReader();
25.         InputStream in=UpdateXML.class.getClassLoader().getResourceAsStream("ibm.xml");
26.         XMLWriter xmlWriter=null;
27.         try {
28.             Document doc=saxReader.read(in);
29.             List<Element> list = doc.selectNodes("//journal/article");//得到article元素列表.
30.             Iterator<Element> it = list.iterator();
31.             while(it.hasNext()){
32.                 Element elem= it.next();
33.                 Attribute attri=elem.attribute("level");
34.                 if(attri.getValue().equals("Intermediate")){//将article元素的属性修改为Introductory
35.                     attri.setValue("Introductory");
36.                 }
37.             }
38.             List<Element> listArticle=doc.selectNodes("//journal/article");
39.             Iterator<Element> itAtricle=listArticle.iterator();
40.             while(itAtricle.hasNext()){//迭代修改每个article元素的title子节点的文本.
41.                 Element elemArticle = itAtricle.next();
42.                 Iterator<Element> itetor= elemArticle.elementIterator("title");
43.                 while(itetor.hasNext()){
44.                     Element titleElem=itetor.next();
45.                     if("Java configuration with XML Schema".equals(titleElem.getText())){
46.                         titleElem.setText("Hell Chenyang");
47.                     }
48.                 }
49.             }
50.             xmlWriter = new XMLWriter(new FileWriter(new File("E://update_ibm.xml")));
51.             xmlWriter.write(doc);
52.         
53.         } catch (DocumentException e) {
54.             e.printStackTrace();
55.         } catch (IOException e) {
56.             e.printStackTrace();
57.         }finally{
58.             if(xmlWriter!=null){
59.                 try {
60.                     xmlWriter.close();
61.                 } catch (IOException e) {
62.                     e.printStackTrace();
63.                 }
64.             }
65.         }
66.     }
67. }