addbookaction.java

来自「beginJsp2.0外文书籍源代码」· Java 代码 · 共 36 行

package com.wrox.shop;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

/**
 * Struts Action invoked when the user wants to add a Book to the cart.
 */
public class AddBookAction extends Action {
    /** 
     * Invoked by the Struts controller.
     * @param mapping The ActionMapping invoking this Action.
     * @param form The ActionForm. Ignored.
     * @param request The HTTP request.
     * @param response The HTTP response.
     * @return the ActionForward item labelled "success".
     */    
    public ActionForward execute(ActionMapping mapping, 
                                 ActionForm form,
                                 HttpServletRequest request, 
                                 HttpServletResponse response) {
        ServletContext ctx = servlet.getServletContext();
        Catalog catalog = (Catalog)ctx.getAttribute("catalog");
        ShoppingCart cart = (ShoppingCart)form;
        int book = Integer.parseInt(request.getParameter("index"));
        cart.addBook((Book)catalog.get(book));
        return mapping.findForward("success");
    }
}