cartaction.java

该代码是Java数据库高级编程宝典中的重要的代码

package jdbcbook.shopping.action;

import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.DynaActionForm;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.ServletException;
import java.io.IOException;

import jdbcbook.shopping.util.DispatchActionEx;
import jdbcbook.shopping.util.SessionUtil;
import jdbcbook.shopping.bean.Cart;

public class CartAction extends DispatchActionEx
{
	// 修改购物车中的商品数量
	public ActionForward update(ActionMapping mapping,
								ActionForm form,
								HttpServletRequest request,
								HttpServletResponse response)
								throws IOException, ServletException
	{
		Integer productid = (Integer)( (DynaActionForm)form ).get( "productid" );
		Integer quantity = (Integer)( (DynaActionForm)form ).get( "quantity" );
		if( productid!=null && quantity!=null )
		{
			Cart cart = SessionUtil.getCart( request );
			if( cart!=null )
			{
				cart.updateCartitem( productid.intValue(), quantity.intValue() );
			}
		}
		return unspecified( mapping, form, request, response );
	}

	// 删除购物车中的商品
	public ActionForward clean(ActionMapping mapping,
								ActionForm form,
								HttpServletRequest request,
								HttpServletResponse response)
								throws IOException, ServletException
	{
		SessionUtil.cleanCart( request );
		return unspecified( mapping, form, request, response );
	}

	// 删除购物车中的商品
	public ActionForward delete(ActionMapping mapping,
								ActionForm form,
								HttpServletRequest request,
								HttpServletResponse response)
								throws IOException, ServletException
	{
		Integer productid = (Integer)( (DynaActionForm)form ).get( "productid" );
		if( productid!=null )
		{
			Cart cart = SessionUtil.getCart( request );
			if( cart!=null )
			{
				cart.delCartitem( productid.intValue() );
			}
		}
		return unspecified( mapping, form, request, response );
	}

	// 向购物车中添加商品
	public ActionForward add(ActionMapping mapping,
								ActionForm form,
								HttpServletRequest request,
								HttpServletResponse response)
								throws IOException, ServletException
	{
		Integer productid = (Integer)( (DynaActionForm)form ).get( "productid" );
		if( productid!=null )
		{
			Cart cart = SessionUtil.getCart( request );
			if( cart==null )
			{
				cart = new Cart();
				SessionUtil.addCart( request, cart );
			}

			// 默认购买一个商品
			cart.addCartitem( productid.intValue(), 1 );
		}

		return unspecified( mapping, form, request, response );
	}
	
	// 查看购物车
	public ActionForward unspecified(ActionMapping mapping,
								ActionForm form,
								HttpServletRequest request,
								HttpServletResponse response)
								throws IOException, ServletException
	{
		request.setAttribute( "cart", SessionUtil.getCart( request ) );
		return mapping.findForward( "cart" );
	}
}