夜深了还在为关于jsp+tomcat+mysql数据库连接的问题头痛!请高手帮忙
我在tomcat容器编译时DOS中提示   java.lang.ClassNotFoundException
      com.mysql.jdbc.Driver
message  

description   The   server   encountered   an   internal   error   ()   that   prevented   it   from   fulfilling   this   request.

exception  

org.apache.jasper.JasperException
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:372)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)


root   cause  

java.lang.NullPointerException
org.apache.jsp.first_jsp._jspService(first_jsp.java:98)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)


note   The   full   stack   trace   of   the   root   cause   is   available   in   the   Apache   Tomcat/5.0.28   logs.

下面是数据库的连接代码
package   com.netshop;

import   java.sql.*;

public   class   OpenDB
{
       
        String   userName= "root ";
        String   userPassword= "123456 ";    
        private   String   driverName   =   "com.mysql.jdbc.Driver ";// "org.gjt.mm.mysql.Driver ";(两种加载驱动程序方式都不行)
        private   String   url   =   "jdbc:mysql://localhost/netshop?useUnicode=true&characterEncoding=gb2312 ";

        Connection   dbConn;
        public   OpenDB()
        {

        }
        public   Connection   getConnection()
        {
                try
                {
                        Class.forName(driverName);
                        dbConn=DriverManager.getConnection(url,userName,userPassword);
                }
                catch(Exception   ex)
                {
                        System.out.println(ex.toString());
                        dbConn   =   null;
  &