editservlet2.java

网上购物源代码

package com.chinaaccpservlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.HashMap;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import com.chinaaccpDao.BookCount;
import com.chinaaccpbean.CartBean;

public class EditServlet2 extends HttpServlet {

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		
		response.setHeader("param", "no-no-cache");
		response.setHeader("cache-control", "no-cache");
		HttpSession session = request.getSession();
		ArrayList list = (ArrayList)session.getAttribute("cartlist");
		HashMap hm = (HashMap)session.getAttribute("hashmap");
		PrintWriter out = response.getWriter();
		String[] count = request.getParameterValues("count");
		String[] id = request.getParameterValues("id");
		int cnt = 0;
		int cnt2 = 0;
		//if(count==null||count[0].equals(""))
		//{
		//	out.println("<script>");
		//	out.println("alert('数量不能为空,或负数');");
		//	out.println("location.href='CartMessServlet'");
		//	out.println("</script>");
		//	return;
		//}
		for(int i = 0;i<count.length;i++)
		{
			cnt=Integer.parseInt(count[i]);
			if(cnt<=0)
			{
				out.println("<script>");
				out.println("alert('数量不能为负数或零');");
				out.println("location.href='CartMessServlet'");
				out.println("</script>");
				return;
			}
			BookCount bookcnt = new BookCount();
			cnt2=bookcnt.GetBookCount(id[i]);
			//System.out.println(cnt+"  "+cnt2);
			if(cnt2<cnt)
			{
				out.println("<script>");
				out.println("alert('数量已不足');");
				out.println("location.href='CartMessServlet'");
				out.println("</script>");
				return;
			}
			
			hm.put(id[i], cnt);
			
		}
		
		session.setAttribute("hashmap", hm);
		RequestDispatcher dis = request.getRequestDispatcher("CartMessServlet");
		dis.forward(request, response);
		
		out.flush();
		out.close();
	}

	
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		
		this.doGet(request, response);
	
	}

}