怎样使用JAVA BEAN连接SQL2000

package cn.edu.xmu.software.bean;
import java.sql.*;

import org.w3c.dom.Document;
public class DataBaseConnect
{
private static String driverName=null;
private static String connectURL=null;
private static String username=null;
private static String password=null;

public DataBaseConnect()
{

}

public void readConfig()
{
ReadConfigurationXML readxml=new ReadConfigurationXML();
Document doc=readxml.readXMLDocument();
driverName=readxml.getContent(doc, "jdbcdriver");
connectURL=readxml.getContent(doc, "url");
username=readxml.getContent(doc, "username");
password=readxml.getContent(doc, "password");
}

public Connection getDataBaseConnection()
{

if(driverName==null ||connectURL==null || username==null ||username==null)
readConfig();
Connection conn=nul