dom4j读取XML配置文件示例

XML配置文件内容如下:

Xml代码  

1. <?xml version="1.0" encoding="UTF-8"?>  
2. <config>  
3.     <db-info>  
4.         <driver-name>oracle.jdbc.driver.OracleDriver</driver-name>  
5.         <url>jdbc:oracle:thin:@127.0.0.1:1521:ORCL</url>  
6.         <username>username</username>  
7.         <password>password</password>  
8.     </db-info>  
9. </config>  
10.    

读取XML程序如下,利用单例模式:

Java代码  

1. package com.king.drp.util;  
2.   
3. import org.dom4j.Document;  
4. import org.dom4j.DocumentException;  
5. import org.dom4j.Element;  
6. import org.dom4j.io.SAXReader;  
7.   
8. /** 
9.  * 采用单例模式读取xml配置文件sys-config.xml 
10.  * @author lijike 
11.  * 
12.  */  
13. public class ConfigReader {  
14.   
15.     //静态的私有成员变量  
16.     private static ConfigReader instance = new ConfigReader();  
17.       
18.     //公共的静态入口方法  
19.     public static ConfigReader getInstance() {  
20.         return instance;  
21.     }  
22.       
23.     private Document doc;  
24.       
25.     private JdbcInfo jdbcInfo;  
26.       
27.     public JdbcInfo getJdbcInfo() {  
28.         return jdbcInfo;  
29.     }  
30.       
31.     //私有的构造方法  
32.     private ConfigReader() {  
33.         try {  
34.             doc = new SAXReader().read(Thread.currentThread().getContextClassLoader().getResourceAsStream("sys-config.xml"));  
35.             Element driverNameElt = (Element)doc.selectObject("/config/db-info/driver-name");  
36.             Element urlElt = (Element)doc.selectObject("/config/db-info/url");  
37.             Element usernameElt = (Element)doc.selectObject("/config/db-info/username");  
38.             Element passwordElt = (Element)doc.selectObject("/config/db-info/password");  
39.             jdbcInfo = new JdbcInfo();  
40.             jdbcInfo.setDriverName(driverNameElt.getStringValue());  
41.             jdbcInfo.setUrl(urlElt.getStringValue());  
42.             jdbcInfo.setUsername(usernameElt.getStringValue());  
43.             jdbcInfo.setPassword(passwordElt.getStringValue());  
44.         } catch (DocumentException e) {  
45.             e.printStackTrace();  
46.         }  
47.     }  
48. }