XMLUtil

mport javax.xml.parsers.*;

import org.w3c.dom.*;

import org.xml.sax.SAXException;

import java.io.*;

class XMLUtil

{

//该方法用于从XML配置文件中提取具体类类名，并返回一个实例对象

       public  static Object getBean()

       {

              try

              {

                     //创建文档对象

                     DocumentBuilderFactory  dFactory = DocumentBuilderFactory.newInstance();

                     DocumentBuilder  builder = dFactory.newDocumentBuilder();

                     Document  doc;                                                

                     doc  = builder.parse(new File("config.xml"));

             

                     //获取包含类名的文本节点

                     NodeList  nl = doc.getElementsByTagName("className");

            Node  classNode=nl.item(0).getFirstChild();

            String  cName=classNode.getNodeValue();

           

            //通过类名生成实例对象并将其返回

            Class c=Class.forName(cName);

                 Object obj=c.newInstance();

            return obj;

         }  

         catch(Exception e)

         {

              e.printStackTrace();

              return null;

          }

       }

}