Eclipse使用JDBC方式连接SQLServer2008

package com;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.sun.crypto.provider.RC2Parameters;

//登陆处理
public class LoginCL extends HttpServlet  {
    
    public void doGet(HttpServletRequest req,HttpServletResponse res){
        Connection ct=null;
        Statement sm = null;
        ResultSet rs = null;
        try{
            //接收用户名和密码
            String u=req.getParameter("username");
            String p=req.getParameter("passwd"); 
            //加载驱动,不同版本sqljdbc42.jar解压后文件夹顺序不同
            Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
            //得到链接
            ct=DriverManager.getConnection(　　
                    "jdbc:sqlserver://127.0.0.1:1433;databaseName = madb","sa","123");　　//因为连接的是sql2008,不用加microsoft！！！！            
            sm = ct.createStatement();
            rs = sm.executeQuery("select top 1 * from users where username=‘"+u+"‘ and passwd=‘"+p+"‘");
            //验证
            if(rs.next()){
                res.sendRedirect("wel");
            }
            else{
                System.out.println("登陆失败");
            }
        }
        catch(Exception ex){
            ex.printStackTrace();
        }
        finally{
            if(rs!=null){
                try {
                    rs.close();
                } catch (SQLException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
            if(sm!=null){
                try {
                    sm.close();
                } catch (SQLException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
            if(ct!=null){
                try {
                    ct.close();
                } catch (SQLException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }    
        }
    }
    
public void doPost(HttpServletRequest req,HttpServletResponse res){
        doGet(req,res);
    }

}