addcar.java

网上书店网站源代码

package bookshop.bean;
import java.io.*;
import java.sql.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import bookshop.bean.shopcar;
import bookshop.bean.StrClass;
public class AddCar extends HttpServlet{
	public void doGet(HttpServletRequest request,
	HttpServletResponse response)
	 throws ServletException, IOException {
		HttpSession session=request.getSession();
		String ToJSP="/addCarSuccess.jsp";
		String BookNo=request.getParameter("BookNo");
		StrClass quanlity=new StrClass(request.getParameter("quanlity"));
		if(!quanlity.isNum()){
			request.setAttribute("errInf","*请输入自然数");
			ToJSP="/addcar.jsp";
		}else{
			Vector list=new Vector();
			if(session.getAttribute("carList")!=null){
				list=(Vector)session.getAttribute("carList");
				session.removeAttribute("carList");
				for(int i=0;i<list.size();i++){
					shopcar car=(shopcar)list.elementAt(i);
					if(BookNo.equals(car.getBookNo())){
						list.removeElementAt(i);
						break;
					}
				}
			}
			shopcar car=new shopcar(BookNo,quanlity.toInt());
			list.addElement(car);
			session.setAttribute("carList",list);
		}
RequestDispatcher dispatcher=request.getRequestDispatcher(ToJSP);
		dispatcher.forward(request,response);
	}
	public void doPost(HttpServletRequest request,HttpServletResponse response)throws ServletException,IOException
	{
		doGet(request,response);
	}
}