Spring Framework example source code file (ViewCategoryController.java)

This example Spring Framework source code file (ViewCategoryController.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Spring Framework tags/keywords

cannot, category, category, controller, http, illegalstateexception, map, modelandview, modelandview, pagedlistholder, pagedlistholder, request, response, servlet, string, util, viewproductaction_category, viewproductaction_productlist, viewproductaction_productlist

The Spring Framework ViewCategoryController.java source code

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

import java.util.HashMap;
import java.util.Map;

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

import org.springframework.beans.support.PagedListHolder;
import org.springframework.samples.jpetstore.domain.Category;
import org.springframework.samples.jpetstore.domain.logic.PetStoreFacade;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;

/**
 * @author Juergen Hoeller
 * @since 30.11.2003
 */
public class ViewCategoryController implements Controller {

	private PetStoreFacade petStore;

	public void setPetStore(PetStoreFacade petStore) {
		this.petStore = petStore;
	}

	public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {
		Map model = new HashMap();
		String categoryId = request.getParameter("categoryId");
		if (categoryId != null) {
			Category category = this.petStore.getCategory(categoryId);
			PagedListHolder productList = new PagedListHolder(this.petStore.getProductListByCategory(categoryId));
			productList.setPageSize(4);
			request.getSession().setAttribute("ViewProductAction_category", category);
			request.getSession().setAttribute("ViewProductAction_productList", productList);
			model.put("category", category);
			model.put("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();
			}
			model.put("category", category);
			model.put("productList", productList);
		}
		return new ModelAndView("Category", model);
	}

}