JSP - Jede Menge Tasten und Lasten von IF-Anweisungen einreichen

Question

Meine JSP-Seite viele Submit-Buttons zum Beispiel hat

<input type="submit" name="RemoveCustomer" value="Submit"/>
<input type="submit" name="AddCustomer" value="Submit"/>

und in meinem scriptlet Tag Ich habe so etwas wie diese

if(request.getParameter("addByName") != null && request.getParameter("addByName").length() > 0) {
  ...
} else {
  if(request.getParameter("removeByName") != null && request.getParameter("removeByName").length() > 0) {
    ...
  } else {
    ...
  }

}

Wo addByName und removeByName sind HTML-Textfelder

Klar könnte ich den Knopf RemoveCustomer den Zugriff removeByName klicken und etwas tun, aber wenn der addByName TextField- nicht leer war es ein Kunde hinzufügen würde.

Was ich wissen will, in meinem scriptlet ist, wie kann ich wissen, was Submit-Button gedrückt wurde?

Answer 1

You can do request.getParameter("name of submitbutton"). Here name of submit button is RemoveCustomer or AddCustomer.

Answer 2

You could put sections in <div> with class or id that makes clear what has happened.

It sounds to me like your JSP is in need of a good refactoring. If you agree, I have two suggestions:

1. Eliminate all scriptlet code and use only JSTL. JSPs are for view only; move all logic out of the page.
2. The logic really belongs in controllers on the server side. Have a Front View Controller servlet that accepts all incoming traffic and delegates requests to classes that are written specifically to handle different use cases.
3. You might have grown to the point where your app could benefit from an MVC framework like Spring, Wicket, etc. I'd recommend looking into one.