shoppingaction.java

简单的web应用,实现基本的购物车功能,有良好的扩展性

package struts.action;

import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionForm;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.ActionForward;
import struts.actionform.ShoppingForm;
import org.apache.struts.action.Action;
import bo.ProductBo;
import java.util.ArrayList;
import bo.ShoppingBo;

public class ShoppingAction extends Action {
    public ActionForward execute(ActionMapping actionMapping,
                                 ActionForm actionForm,
                                 HttpServletRequest servletRequest,
                                 HttpServletResponse servletResponse) {
        ShoppingForm form = (ShoppingForm) actionForm;

        return this.getActionForward(actionMapping, form, servletRequest);
    }

    /**
     * 页面转向
     * @param mapping
     * @param theForm
     * @return 将要转向的页面
     */
    private ActionForward getActionForward(ActionMapping mapping,
                                           ShoppingForm form,
                                           HttpServletRequest request) {
        String event = form.getEvent();
        ShoppingBo bo = ShoppingBo.getInstance();
        if ("removeproduct".equals(event)) {
            bo.removeProduct(form);
            return mapping.findForward("viewcart");
        }else if("viewcart".equals(event)){
            return mapping.findForward("viewcart");
        }else if("addproduct".equals(event)){
            bo.addProduct(form);
        }else if("checkout".equals(event)){
            bo.checkOut(form , request);
        }

        form.setProductList((ArrayList) bo.getProductList());
        return mapping.findForward("shopping");
    }

}