updateshopcartservlet.java

基于jsp的网上书店

package shop;

import java.io.IOException;
import java.util.Vector;

import javax.servlet.ServletConfig;
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 final class UpdateShopCartServlet extends HttpServlet{
	
	
	public UpdateShopCartServlet(){
		super();
	}
	
	public void init(ServletConfig config)throws ServletException{
		super.init(config);
	}
	public void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {      
		 
		HttpSession session = req.getSession();
		if(session==null){
			System.out.println("no session");
			System.exit(1);
			
		}
		
		Integer[] count = (Integer[])req.getAttribute("count");
		Integer[] del = (Integer[])req.getAttribute("del");
						
		ShopCart shopcart = new ShopCart();
   		Vector shopCartList=(Vector)session.getAttribute(Constants.SHOPCART_KEY);
/*
 * 更新数量
 */
       	if(shopCartList!=null){
       		for(int i = 0; i < shopCartList.size() ;i++){
       			shopcart = (ShopCart)shopCartList.get(i);
       			shopcart.setCount(count[i].intValue());
       			shopCartList.set(i,shopcart);
			}
/*
  * 从购物车中删除
 */        
       		for(int i = shopCartList.size()-1;i >=0 ;i--){
       			shopcart = (ShopCart)shopCartList.get(i);
       			for(int j = 0;j < del.length;j++){
     				if (shopcart.getProduct().getId()==del[j].intValue()){
     					shopCartList.remove(i);
     				}
				}
			}
			session.setAttribute(Constants.SHOPCART_KEY,shopCartList);
       	}
	   	resp.sendRedirect("basket_OK.jsp");					
 	}
 	
}