Keep an IT training diary 054- opening and closing

04 month 06 Japan a sunny day good

Today web Version Student object crud, Brother Dao said 2 Two operation schemes , Then let's discuss which is the best , There is a dispute between separation and combination .

programme 1：

Use ListServlet,SaveServlet,UpdateServlet,DeleteServlet 4 individual servlet Realize the students CRUD operation

public class ListServlet extents HttpServlet{
   public void service(HttpServletRequest req, HttpServletReponse resp){
        ....
   }
}

public class ServletServlet extents HttpServlet{
   public void service(HttpServletRequest req, HttpServletReponse resp){
        ....
   }
}

......

programme 2：

Use one StudentServlet + cmd Parameters to achieve students CRUD

public class StudentServlet extents HttpServlet{
   public void service(HttpServletRequest req, HttpServletReponse resp){
        String cmd = reqeust.getParameter("cmd");
        if("save".eqauls(cmd){
            ....
        }else if ("delete".eqauls(cmd)){
            ....
        }
   }
}

After the group discussion , I choose the scheme with Xiaoshou 2, Small C Choose a plan with xiaopang 1, The old A, Big B I think it's ok

Little fat ： It must be a plan 1 Okay ,CRUD 4 individual Servlet clear

I ： You don't think class is so ？

Little fat ： Is it abnormal to have too many classes , Aren't all big projects piled up by classes , How easy it is to write in this way .

I ： programme 2 It's also very clear , Use cmd Parameters of the way , And agree list, save,update, delete 4 The parameters represent 4 Operation logic . All implementations are 1 A thunder , And you have to 4 individual , You don't think class is so ？

Little fat ： programme 2 That kind of , If you don't pass cmd Parameters , It's easy to have problems , programme 1 No parameters , Much simpler .

I ： stay if Add else Just make a bag , No transmission cmd Go straight into list List operation is OK PULL ,1 A class can handle operations , I have to do it 4 Classes , Fancy , You don't think class is so ？

Little fat ： Do not feel , I'd love to .

I ： Are you sure? ？ Don't you really think ？

Little fat ： yes ~~

I ： Come on , You write me another teacher object CRUD~

Little fat ： I wipe ~

If the world is united for a long time, it must be divided , Long period of division , Whether to argue or not is there ~ ha-ha ~