16.首页查询一级分类商品（分类显示商品）

1、封装分页PageBean

package cn.xdy.shop.util;

import java.util.List;

public class PageBean {
	private int page;//当前页数
	private int totalCount;//总记录数
	private int totalPage;//总页数
	private int limit;//每页显示的记录数
	private List list;//每页显示数据的集合
	public int getPage() {
		return page;
	}
	public void setPage(int page) {
		this.page = page;
	}
	public int getTotalCount() {
		return totalCount;
	}
	public void setTotalCount(int totalCount) {
		this.totalCount = totalCount;
	}
	public int getTotalPage() {
		return totalPage;
	}
	public void setTotalPage(int totalPage) {
		this.totalPage = totalPage;
	}
	public int getLimit() {
		return limit;
	}
	public void setLimit(int limit) {
		this.limit = limit;
	}
	public List getList() {
		return list;
	}
	public void setList(List list) {
		this.list = list;
	}
	
	
}

2、menu.jsp

					
&page=1">|
				

3、ProductAction

package cn.xdy.shop.product.action;

import cn.xdy.shop.product.service.ProductService;
import cn.xdy.shop.product.vo.Product;
import cn.xdy.shop.util.PageBean;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;


public class ProductAction extends ActionSupport implements ModelDriven{
	private ProductService productService;
	private Product product = new Product();
	private int page;//当前页数
	private int cid;//接收分类cid
	
	
	public int getCid() {
		return cid;
	}

	public void setCid(int cid) {
		this.cid = cid;
	}

	public void setPage(int page) {
		this.page = page;
	}

	public void setProductService(ProductService productService) {
		this.productService = productService;
	}

	public Product getModel() {
		return product;
	}
	
	public String findByPid(){
		product = productService.findByPid(product.getPid());
		return "findByPid";
	}
	
	/**
	 * 根据分类ID查询所有
	 * @return
	 */
	
	public String findByCid(){
		//因为IndexAction中查询了一级分类存入session中，所以此处不再查询，页面上直接从session中取即可。
		PageBean pageBean = productService.findByPageCid(cid,page);
		ActionContext.getContext().getValueStack().set("pageBean", pageBean);
		return "findByCid";
	}
	
	
}
 

4、ProductService

package cn.xdy.shop.product.service;

import java.util.List;

import org.springframework.transaction.annotation.Transactional;

import cn.xdy.shop.product.dao.ProductDao;
import cn.xdy.shop.product.vo.Product;
import cn.xdy.shop.util.PageBean;

@Transactional
public class ProductService {
	private ProductDao productDao;

	public void setProductDao(ProductDao productDao) {
		this.productDao = productDao;
	}

	/**
	 * 查询最热门商品
	 * @return
	 */
	public List findHot() {
		return productDao.findHot();
	}

	/**
	 * 查询最新商品
	 * @return
	 */
	public List findNew() {
		return productDao.findNew();
	}

	/**
	 * 根据pid查询商品信息
	 * @param pid
	 * @return
	 */
	public Product findByPid(Integer pid) {
		return productDao.findByPid(pid);
	}

	/**
	 * 根据一级分类的cid带有分页查询商品
	 * @param cid
	 * @param page
	 * @return
	 */
	public PageBean findByPageCid(int cid, int page) {
		PageBean pageBean = new PageBean();
		//设置当前页数
		pageBean.setPage(page);
		//设置每页显示记录数
		int limit = 16;
		pageBean.setLimit(limit);
		//设置总记录数
		int totalCount = 0;
		totalCount = productDao.findCountCid(cid);
		pageBean.setTotalCount(totalCount);
		//设置总页数
		int totalPage = 0;
		if(totalCount%limit==0){
			totalPage = totalCount/limit;
		}else{
			totalPage = totalCount/limit+1;
		}
		pageBean.setTotalPage(totalPage);
		//每页显示的数据集合
		int begin = (page-1)*limit;
		List list = productDao.findByPageCid(cid,begin,limit);
		pageBean.setList(list);
		return pageBean;
	}
	
	
}

5、ProductDao

package cn.xdy.shop.product.dao;

import java.util.List;

import org.hibernate.criterion.DetachedCriteria;
import org.hibernate.criterion.Order;
import org.hibernate.criterion.Restrictions;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;

import cn.xdy.shop.product.vo.Product;
import cn.xdy.shop.util.PageHibernateCallback;

public class ProductDao extends HibernateDaoSupport{

	/**
	 * 查询最热门商品
	 * @return
	 */
	public List findHot() {
		DetachedCriteria criteria = DetachedCriteria.forClass(Product.class);
		criteria.add(Restrictions.eq("is_hot", 1));
		criteria.addOrder(Order.desc("pdate"));
		List list = this.getHibernateTemplate().findByCriteria(criteria, 0, 10);
		return list;
	}

	/**
	 * 查询最新商品
	 * @return
	 */
	public List findNew() {
		DetachedCriteria criteria = DetachedCriteria.forClass(Product.class);
		criteria.addOrder(Order.desc("pdate"));
		List list = this.getHibernateTemplate().findByCriteria(criteria, 0, 10);
		return list;
	}

	/**
	 * 根据ID查询商品
	 * @param pid
	 * @return
	 */
	public Product findByPid(Integer pid) {
		return this.getHibernateTemplate().get(Product.class, pid);
	}

	/**
	 * 根据分类ID查询个数
	 * @param cid
	 * @return
	 */
	public int findCountCid(int cid) {
		String hql = "select count(*) from Product p where p.categorySecond.category.cid=?";
		List list = this.getHibernateTemplate().find(hql, cid);
		if(list!=null && list.size()>0){
			return list.get(0).intValue();
		}
		return 0;
	}

	/**
	 * 根据分类ID查询带有分页的商品的集合
	 * @param cid
	 * @param begin
	 * @param limit
	 * @return
	 */
	public List findByPageCid(int cid, int begin, int limit) {
		String hql = "select p from Product p join p.categorySecond cs join cs.category c where c.cid=?";
		List list = this.getHibernateTemplate().execute(new PageHibernateCallback(hql, new Object[]{cid}, begin, limit));
		return list;
	}

}

6、ProductList.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="/struts-tags" prefix="s"%>












	

		

			
				
			
		
	
	


					
	
	
	<%@include file="menu.jsp" %>
	

		

			

				
						

							

								
							
								
									

										
									
								
						
						
			
		
		

			
			

				
					
				

						

							
									

										
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