dom4j学习笔记(一)

dom4j是一个性能非常不错的解析xml的开源框架.其解析性能高于sun提供的domAPI,而且使用起来也非常方便.值得学习!

下面,经创建ibm.xml这样一个xml文件为例,总结一下,怎么用dom4j创建一个xml文件.

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>

新建一个测试类,XMLCreater,代码如下:

 

1. package org.james.dom4j;
3. import java.io.File;
4. import java.io.FileWriter;
5. import java.io.IOException;
7. import org.dom4j.Document;
8. import org.dom4j.DocumentHelper;
9. import org.dom4j.Element;
10. import org.dom4j.io.XMLWriter;
12. public class XMLCreater {
14.     /**
15.      * @param args
16.      */
17.     public static void main(String[] args) {
18.         Document doc=DocumentHelper.createDocument();
19.         Element elemCatalog = doc.addElement("catalog");//创建根节点
20.         elemCatalog.addComment("An XML Catalog");//添回注释
21.         elemCatalog.addProcessingInstruction("target", "text");//添加处理指令
22.         Element elemJournal = elemCatalog.addElement("journal");//为elemCatalog元素添加子节点journal
23.         elemJournal.addAttribute("title", "XML Zone");//为journal设置属性title
24.         elemJournal.addAttribute("publisher","IBM developerWorks");
25.         
26.         Element elemArticle = elemJournal.addElement("article");
27.         elemArticle.addAttribute("level", "Intermediate");
28.         elemArticle.addAttribute("date", "December-2001");
29.         
30.         Element elemTitle = elemArticle.addElement("title");
31.         elemTitle.setText("Java configuration with XML Schema");//添加文本节点
32.         
33.         Element elemAuthor = elemArticle.addElement("author");
34.         
35.         Element elemFirstName = elemAuthor.addElement("firstname");
36.         Element elemLastName = elemAuthor.addElement("lastname");
37.         
38.         elemFirstName.setText("Marcello");
39.         elemLastName.setText("Vitaletti");
40.         XMLWriter xmlWriter=null;
41.         try {
42.              xmlWriter = new XMLWriter(new FileWriter(new File("E://ibm.xml")));
43.             xmlWriter.write(doc);
44.         } catch (IOException e) {
45.             e.printStackTrace();
46.         }finally{
47.             try {
48.                 xmlWriter.close();
49.             } catch (IOException e) {
50.                 e.printStackTrace();
51.             }
52.         }
53.         
54.     }
55. }