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${sessionScope.Cart}
${sessionScope.user}
<a href= getOrders?user=${user}&Cart=${Cart}> 去下单</a>
http://localhost:8080/TakewayWeb/getOrders?user=com.Takeway.model.User@335c9979&Cart={3=com.Takeway.model.Cart@b581ee4,
User user =(User) request.getAttribute("user");
Map<Integer, Cart> cart = (Map<Integer, Cart>) request.getAttribute("Cart");