dom4j读取XML文件详解

// 从文件读取XML，输入文件名，返回XML文档 
public Document read(String fileName) throws MalformedURLException, DocumentException { 
  SAXReader reader = new SAXReader(); 
  Document document = reader.read(new File(fileName)); 
  return document; 
} 

<&＃63;xml version="1.0" encoding="UTF-8"&＃63;> 
 
  
  oracle.jdbc.driver.OracleDriver 
  jdbc:oracle:thin:@localhost:1522:mydb 
  drp 
  drp 
  
 

package com.util; 
 
import java.io.InputStream; 
import java.util.HashMap; 
import java.util.List; 
import java.util.Map; 
 
import org.dom4j.Document; 
import org.dom4j.DocumentException; 
import org.dom4j.Element; 
import org.dom4j.io.SAXReader; 
 
/** 
 * 解析sys-config.xml文件 
 * @author Ronaldinho 
 * 
 */ 
 
public class XmlConfigReader { 
  
 //懒汉式 
 private static XmlConfigReader instance = null; 
  
 //保存jdbc相关信息 
 private JdbcConfig jdbcCOnfig= new JdbcConfig(); 
  
 private XmlConfigReader() { 
 
  //建立一个SAXReader对象 
  SAXReader reader=new SAXReader(); 
 
  //通过当前线程的类加载器，获得文件的相对路径，读入缓冲输入流 
  InputStream in=Thread.currentThread().getContextClassLoader().getResourceAsStream("sys-config.xml"); 
  try { 
   //通过流来读取xml文件 
   Document doc=reader.read(in); 
    
   //读取jdbc相关信息 
   Element driverNameElt=(Element) doc.selectObject("/config/db-info/driver-name"); 
   Element urlElt=(Element) doc.selectObject("/config/db-info/url"); 
   Element userNameElt=(Element) doc.selectObject("/config/db-info/user-name"); 
   Element passwordElt=(Element) doc.selectObject("/config/db-info/password"); 
    
   //设置jdbc相关信息 
   jdbcConfig.setDrivername(driverNameElt.getStringValue()); 
   jdbcConfig.setUrl(urlElt.getStringValue()); 
   jdbcConfig.setUsername(userNameElt.getStringValue()); 
   jdbcConfig.setPassword(passwordElt.getStringValue()); 
 
  } catch (DocumentException e) { 
   e.printStackTrace(); 
  } 
 } 
  
 public static synchronized XmlConfigReader getInstance() { 
  if (instance==null) { 
   instance = new XmlConfigReader(); 
  } 
  return instance; 
 } 
}