buyaction.java

ShoppingOnline 是一个网上购物系统的源代码 由eclipse+jsp+tomcat+strust

package cn.com.shoppingonline;

import java.util.Vector;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;
import org.apache.struts.action.ActionMessages;
import org.apache.struts.action.DynaActionForm;

public final class BuyAction extends Action{  
	public ActionForward execute(
		ActionMapping mapping,
		ActionForm form,
		HttpServletRequest request,  
		HttpServletResponse response) throws Exception {
			
   		DynaActionForm productIdForm = (DynaActionForm) form;         
		Integer productId = (Integer)productIdForm.get("productId");
		
        HttpSession session = request.getSession();
		String PageForward;
		boolean bBought=false;
        
		ShopCart compareShopCart = new ShopCart();
   		Vector shopCartList=(Vector)session.getAttribute(Constants.SHOPCART_KEY);
		if (shopCartList==null) {
			shopCartList = new Vector();
		}
		/*
		*判断选定商品是否已经加入购物车
		*/
		ActionMessages errors = new ActionMessages();
    	if(shopCartList != null ){
       		for(int i = 0;i < shopCartList.size();i++){
       			compareShopCart = (ShopCart)shopCartList.get(i);
     			if (compareShopCart.getProduct().getId()==productId.intValue()){
     				bBought=true;
     			}
     		}
     	}
		/*
		*将选定商品加入购物车
		*/
		if (!bBought){
			Product product=new DbOperate().getProduct(productId.intValue());
			
			ShopCart shopCart = new ShopCart();
			shopCart.setProduct(product);
			shopCart.setPrice(product.getSaleprice());
			shopCart.setCount(1);
			shopCartList.addElement(shopCart);
			session.setAttribute(Constants.SHOPCART_KEY,shopCartList);
 			PageForward="toShopCart"; 
		}
		else{
            errors.add(ActionMessages.GLOBAL_MESSAGE,
                           new ActionMessage("errors.alreadyBought"));
			if (!errors.isEmpty()) {
						saveErrors(request, errors);
			} 
 			PageForward="toWrong";  
		}
	   	return (mapping.findForward(PageForward));					
 	}	
}