addtobasket.java

购物车实现板块

package showbook;

import java.io.IOException;
import java.util.ArrayList;
import javax.servlet.*;
import javax.servlet.http.*;

public class AddToBasket extends HttpServlet{
     public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
         String[] productInCart = request.getParameterValues("product");
         String[] quantity = request.getParameterValues("quantity");
         if(productInCart==null){
             request.getRequestDispatcher("viewbasket.jsp").forward(request,response);
         }
         else{
      
        	 ProductBasket basket= null;
         HttpSession session = request.getSession(true);
         try{ basket=(ProductBasket)session.getAttribute("basket");
             if(basket==null){
            	 basket = new ProductBasket();
            	 session.setAttribute("basket",basket);
             }
         }
      catch(Exception exp){
    	  basket=new ProductBasket();
    	  session.setAttribute("basket",basket);
      }
      
       
    
       String   b=request.getParameter("update");
     
     if(b==null)
     {
        for(int i=0;i<productInCart.length;i++)
       
    	    basket.addItem(productInCart[i]);
        
     }
     else
    {  
    	
    	for(int i=0;i<productInCart.length;i++)
    		 basket.removeItem(productInCart[i]); 
    	
    }
     if(productInCart!=null)
     {
  for(int j=0;j<quantity.length;j++)
  {     String q=request.getParameter(quantity[j]);
        int t=Integer.parseInt(q);
        basket.setQuantity(quantity[j], t);
        }
    
     }    
         
       
        
         request.getRequestDispatcher("viewbasket.jsp").forward(request,response);
  
         }
 }
}