src/com/drugsp/servlet/user/drugs/DrugByClassifyServlet.java

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package com.drugsp.servlet.user.drugs;

import java.io.IOException;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.drugsp.bean.Classify;
import com.drugsp.bean.Drugs;
import com.drugsp.bean.Order;
import com.drugsp.bean.Shops;
import com.drugsp.bean.User;
import com.drugsp.service.ClassifyService;
import com.drugsp.service.DrugsService;
import com.drugsp.service.OrderService;
import com.drugsp.service.ShopsService;
import com.drugsp.service.UserService;
import com.drugsp.service.impl.ClassifyServiceImpl;
import com.drugsp.service.impl.DrugsServiceImpl;
import com.drugsp.service.impl.OrderServiceImpl;
import com.drugsp.service.impl.ShopsServiceImpl;
import com.drugsp.service.impl.UserServiceImpl;
@WebServlet("/drugbyclassify.do")
/*
 * 按分类查商品
 * */
public class DrugByClassifyServlet extends HttpServlet{

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		doPost(req, resp);
	}

	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		if (req.getParameter("cid").equals("0")) {
			 req.setAttribute("classify", 0);
			req.getRequestDispatcher("drupsearchtouser.do").forward(req, resp);
			return;
		}
		int classify = Integer.parseInt(req.getParameter("cid"));
	    DrugsService ds=new DrugsServiceImpl();
	    ShopsService ss=new ShopsServiceImpl();
	    int page=1;				//		初始化page
	    String reqPage=req.getParameter("page");
//		如果页面传回的不为null，赋值给page
	    if (reqPage!=null) {
			page=Integer.parseInt(reqPage);
		}
	    int l=5;					//每页记录数
	    int count=ds.getCountByClassify(classify);
	    int allPage=0;
//		计算总页数
	    if (count%l==0) {
			allPage=count/l;
		} else {