编写一个类似购物车

编写一个类似购物车  cookie
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1 楼 zhanzhan02 2010-10-08  

AddProductServlet

package ustc.cn.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Enumeration;
import javabean.AddGood;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class AddProductServlet extends HttpServlet {

	
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		
        request.setCharacterEncoding("utf-8");
		response.setContentType("text/html;charset=utf-8");
		PrintWriter out = response.getWriter();
		
	
		String item=request.getParameter("item");
		String mount = request.getParameter("mount");
	
		String unit = request.getParameter("unit");
		int num=10;
		if(mount!=null&&!"".equals(mount.trim())){
			num=Integer.parseInt(mount);
		}
		
		
		AddGood add = new AddGood();
		add.setItem(item);
		add.setMount(num);
		add.setUnit(unit);
	
		HttpSession GoodSession = request.getSession(true);
		
		GoodSession.setAttribute(item,add);
		
		
		out.print("您当前购买的物品:"+item+mount+unit+"<br>");
	
		out.print("您总共购买的物品有:");
		Enumeration<String> em = GoodSession.getAttributeNames();
		while(em.hasMoreElements())
		{
			String name=em.nextElement();
		 AddGood goods = (AddGood)GoodSession.getAttribute(name);
		 if(goods!=null)
			out.print(goods.getItem()+goods.getMount()+goods.getUnit()+"<br>");
		}

		out.print("<a href='./choice.html'>继续购物</a>");
		out.print("<a href='./removegood.html'>删除购物</a>");
	
	}

	
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		this.doGet(request, response);
	}

}

RemoveProductServlet

package ustc.cn.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Enumeration;
import javabean.AddGood;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class RemoveProductServlet extends HttpServlet {

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		request.setCharacterEncoding("utf-8");
		response.setContentType("text/html;charset=utf-8");
		PrintWriter out = response.getWriter();

		// 获取
		String item = request.getParameter("item");

		HttpSession session_delete = request.getSession();

		session_delete.removeAttribute(item);

		// 显示剩下的产品
		out.print("您总共购买的物品有:");
		Enumeration<String> getnames = session_delete.getAttributeNames();
		while (getnames.hasMoreElements()) {

			AddGood goods = (AddGood) session_delete.getAttribute(getnames
					.nextElement());
			if (goods != null)
				out.print(goods.getItem() + goods.getMount() + goods.getUnit()
						+ "<br>");
		}

	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		this.doGet(request, response);
	}

}