viewcategoryaction.java

来自「JPetStore源码」· Java 代码 · 共 52 行

package org.springframework.samples.jpetstore.web.struts;

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

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

import org.springframework.beans.support.PagedListHolder;
import org.springframework.samples.jpetstore.domain.Category;

public class ViewCategoryAction extends BaseAction {

	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response)
			throws Exception {
		String categoryId = request.getParameter("categoryId");
		if (categoryId != null) {
			Category category = getPetStore().getCategory(categoryId);
			PagedListHolder productList = new PagedListHolder(getPetStore()
					.getProductListByCategory(categoryId));
			productList.setPageSize(4);
			request.getSession().setAttribute("ViewProductAction_category",
					category);
			request.getSession().setAttribute("ViewProductAction_productList",
					productList);
			request.setAttribute("category", category);
			request.setAttribute("productList", productList);
		} else {
			Category category = (Category) request.getSession().getAttribute(
					"ViewProductAction_category");
			PagedListHolder productList = (PagedListHolder) request
					.getSession().getAttribute("ViewProductAction_productList");
			if (category == null || productList == null) {
				throw new IllegalStateException(
						"Cannot find pre-loaded category and product list");
			}
			String page = request.getParameter("page");
			if ("next".equals(page)) {
				productList.nextPage();
			} else if ("previous".equals(page)) {
				productList.previousPage();
			}
			request.setAttribute("category", category);
			request.setAttribute("productList", productList);
		}
		return mapping.findForward("success");
	}

}