Struts event programming ! ... re sorry

[emmanuel.boudrant]

What do you about event programming in Java Server Side programming ? With this html button : <input type="submit" name="ok" value="ajouter"> invoke method onAjouter(,,,) <input type="submit" name="ok" value="enregistrer"> invoke method onEnregistrer(,,,) Etc... package com.csi.controller; // Struts import org.apache.struts.action.*; // Servlet import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; // Import log4j classes. import org.apache.log4j.Category; import org.apache.log4j.BasicConfigurator; // Reflect import java.lang.reflect.Method; /** * Titre : MyAction.java * Description : Event Programming in Struts ;) * Copyright : Copyright (c) 2001 * @author : [EMAIL PROTECTED] * @version 0.00001a */ public abstract class MyAction extends Action { static Category log = Category.getInstance(MeeschaertAction.class); public MyAction () { } public ActionForward perform (ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws java.io.IOException, javax.servlet.ServletException { // Get submit parameter 'ok' value // ex: <input type="submit" name="ok" value="ajouter"> String button = request.getParameter("ok"); if (button != null) { // If ok, get the good method name // ex: onAjouter String methodName = "on" + button.toUpperCase().substring(0, 1) + button.toLowerCase().substring(1, button.length()); Method method = null; Class thisAction = this.getClass(); Class param[] = new Class[4]; param[0] = ActionMapping.class; param[1] = ActionForm.class; param[2] = HttpServletRequest.class; param[3] = HttpServletResponse.class; try { // Test if the method exist in derived class method = thisAction.getDeclaredMethod(methodName, param); Object value[] = new Object[4]; value[0] = mapping; value[1] = form; value[2] = request; value[3] = response; // Yes, so invoke it ! return (ActionForward)method.invoke(this, value); } catch (NoSuchMethodException e) { log.debug("EVT(" + e + "): No " + methodName + "(,,,) found, using go(,,,)"); } catch (Exception e) { log.warn("EVT(" + e + "): No " + methodName + "(,,,) found, using go(,,,)", e); } } // Else invoke normal method return go(mapping, form, request, response); } public abstract ActionForward go (ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws java.io.IOException, javax.servlet.ServletException; } Emmanuel,

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