jsp连接数据库

有关web开发……其中的关键步骤：

request.setCharacterEncoding("utf-8");
//获取用户名
String uName=request.getParameter("username");
//获取密码
String pw=request.getParameter("password");

//编写sql语句
String sql="select * from user where userName='"+username+"' and password='"+password+"'" ;
//向数据库发出sql执行查询,查出结果集
ResultSet rs=stmt.executeQuery(sql);
//遍历
while(rs.next()){

 int ident =rs.getInt("ident");
    int userid=rs.getInt("id");
    String userName=rs.getString("userName");
    //存储用户信息
    session.setAttribute("userid",userid);
    session.setAttribute("userName",userName);
    if(ident==1){
        response.sendRedirect("admin_list_user.jsp");
    }else{
        response.sendRedirect("HomePage");
    }
}