java - A more elegant way to handle different requests in the same servlet -

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• design patterns web based applications 5 answers

this code of servlet:

protected void processrequest(httpservletrequest request, httpservletresponse response)             throws servletexception, ioexception     {         string result = (string)request.getparameter("action");          switch (result)         {             case "init":                 request.setattribute("countrieslist", signupbean.getcontrieslist());                 string arg = "/signup.jsp";                 requestdispatcher dispatcher = this.getservletcontext().getrequestdispatcher(arg);                 dispatcher.forward(request, response);                 break;             case "submit":                 //code handle request                 break;         }     } 

when click on link signup?action=init servlet initialized receiving countries list , passing signup.jsp page in order show list on select form element. when compile signup form, push submit button has action="signup?action=submit" in way servlet can handle request. know more elegant way or correct way mean?

create interface action , several implementations. in case init , submit. register these actions in init method of servlet, stored in map<string, action> actions.

now processrequest() like:

string actionname = (string)request.getparameter("action"); action action = actions.get(actionname); action.perform(); 

however seems try re-invent wheel. use 1 of available frameworks. example struts approximately explained here. spring stronger , has same concept.