productaction.java

java学习的必要的资料,servlet的说明很好

package com.estore.struts.action;

import java.util.Collection;

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.apache.struts.actions.DispatchAction;

import com.estore.struts.Globals;
import com.estore.struts.entity.Catalog;
import com.estore.struts.entity.Product;
import com.estore.struts.service.ProductService;
import com.estore.struts.utils.PageHelper;
import com.estore.struts.utils.ServiceFactory;

public class ProductAction extends DispatchAction {

	private static ProductService productService;
	static {
		productService = (ProductService) ServiceFactory.getInstance()
				.getService(Globals.PRODUCT_SERVICE);
	}

	/*
	 * 第一个页面,从数据库中获得商品,并且进行了,分页处理;
	 */
	public ActionForward listAll(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response)
			throws Exception {
		return listByPage(mapping, form, request, response);
	}

	public ActionForward listDetail(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response) {

		Integer id = Integer.parseInt(request.getParameter("productid"));
		request.setAttribute("product", productService.getProductById(id));

		return mapping.findForward("listdetail");
	}

	/*
	 * 搜索想要的产品,根据不同的搜索规则从数据库中取得相应的结果;
	 */
	public ActionForward searchProduct(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response) {

		String text = request.getParameter("text");
		String rule = request.getParameter("radio");
		String catalog = request.getParameter("catalog");
		
		if(! catalog.equals("0")){
			text = catalog;
			rule = "catalog";
		}
		if(text.equals("")){
			request.setAttribute("message","请输入您要查询的内容,请<a onclick='javascript:history.go(-1)' style='color:red;'>返回</a>!");
			return mapping.findForward("error");
		}
		if(rule == null){
			request.setAttribute("message","请选择一种查询规则,请<a onclick='javascript:history.go(-1)' style='color:red;'>返回</a>!");
			return mapping.findForward("error");
		}

		Collection<Product> searchproduct = productService.searchProduct(text,rule);
		request.setAttribute("products", searchproduct);

		int size = searchproduct.size();
		request.setAttribute("size", size);

		return mapping.findForward("listall");
	}

	/*
	 * 将自己所需要的商品添加到数据库中;
	 */
	public ActionForward addProduct(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response) {

		String tag = request.getParameter("tag");
		if (tag.equalsIgnoreCase("true")) {

			String name = request.getParameter("name");
			System.out.println("00000000000000000000"+name);
			String author = request.getParameter("author");
			double price = Double.valueOf(request.getParameter("price"));
			String printer = request.getParameter("printer");
			String isbn = request.getParameter("isbn");
			int booknum = Integer.valueOf(request.getParameter("booknum"));
			String description = request.getParameter("description");
			String imagepath = request.getParameter("imagepath");
			int catalogid = Integer.valueOf(request.getParameter("catalog"));

			Catalog catalog = productService.getCatalog(catalogid);

			Product product = new Product();

			product.setCatalog(catalog);
			
//			1,如果catalog.hbm.xml中将set集合的lazy="true",在向catalog的集合中
//			  添加商品product时,会报出延迟加载异常;
//			  因为catalog是刚从数据库中拿过来的,而没有立即抓取集合造成的;
//			2,如果catalog.hbm.xml中将set集合的lazy="true",在向catalog的集合中
//			  添加商品product时,会报出延迟加载异常;
//			  因为catalog是刚从数据库中拿过来的,处于游离状态,数据库中有相应的记录;
//			  而product是刚new出来的,处于临时状态,在向catalog的集合中添加时,会找
//			  不到相应的id, 正体现了hibernate是通过id来操作持久化对象的;
//			catalog.getProducts().add(product);
			
			product.setName(name);
			product.setAuthor(author);
			product.setPrice(price);
			product.setPrinter(printer);
			product.setIsbn(isbn);
			product.setBooknum(booknum);
			product.setDescription(description);
			product.setImagepath(imagepath);
			product.setCreatetime(new java.sql.Date(System.currentTimeMillis()));
			product.setState(0);

			productService.addProduct(product);
			Collection<Product> products = productService.getProducts();

			int size = products.size();
			request.setAttribute("size", size);
			request.setAttribute("products", products);

			return mapping.findForward("listall");

		} else {
			return mapping.findForward("addproduct");
		}
	}

	/*
	 * 辅助方法
	 */
	public ActionForward listByPage(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response)
			throws Exception {

		int page = 1;
		try {
			//第一次因为没有设置page属性,所以会抛个空指针异常,捕获之后将page设置为1;
			page = Integer.parseInt(request.getParameter("page"));
		} catch (Exception ex) {
			page = 1;
		}

		PageHelper pageHelper = new PageHelper();
		pageHelper.setPageSize(Globals.PAGE_SIZE);
		pageHelper.setCurrentPage(page);
		pageHelper.setMaxCount(productService.getProudctCount());

		Collection<Product> products = productService.getProductsByPages(page);

		request.setAttribute("navigation", pageHelper.showNavigation("listAll"));
		request.setAttribute("products", products);

		int size = products.size();
		request.setAttribute("size", size);
		return mapping.findForward("listall");
	}

}