小项目第三天

购物车的servlet：

// 添加条目

public String add(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

Cart cart = (Cart) request.getSession().getAttribute("cart");// 得到购物车

String bid = request.getParameter("bid");// 得到书的bid

Book book = new BookService().load(bid);// 通过bid得到书的信息

int count = Integer.parseInt(request.getParameter("count"));// 得到数量

CartItem cartItem = new CartItem();// 创建一个条目对象

cartItem.setBook(book);// 设置书

cartItem.setCount(count);// 设置总数

if (cart == null) {

return "f:/jsps/cart/list.jsp";

}

cart.add(cartItem);// 将条目添加到车中

return "f:/jsps/cart/list.jsp";

}

// 删除条目

public String clear(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

Cart cart = (Cart) request.getSession().getAttribute("cart");// 得到购物车

cart.clear();// 清空购物车

return "f:/jsps/cart/list.jsp";

}

// 安照所给的bid删除条目

public String delete(HttpServletRequest request,

HttpServletResponse response) throws ServletException, IOException {

Cart cart = (Cart) request.getSession().getAttribute("cart");// 得到购物车

String bid = request.getParameter("bid");// 得到书的bid

cart.delete(bid);// 根据bid删除条目

return "f:/jsps/cart/list.jsp";

}

购物车的jsp：

<h1>购物车</h1>

<c:choose>

<c:when test="${empty sessionScope.cart or fn:length(sessionScope.cart.cartItems) eq 0 }">

<img src="<c:url value='/images/cart.png'/>" width="250"/>

</c:when>

<c:otherwise>

<table width="100%" cellspacing="0" background="black">

<tr>

<td colspan="7" align="right" style="font-size: 15pt; font-weight: 900">

<a href="<c:url value=" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" /CartServlet?method=clear"/>">清空购物车</a>

</td>

</tr>

<tr>

<th>图片</th>

<th>书名</th>

<th>作者</th>

<th>单价</th>

<th>数量</th>

<th>小计</th>

<th>操作</th>

</tr>

<c:forEach items="${sessionScope.cart.cartItems }" var="cartItem">

<tr>

<td><div><img src="<c:url value='/${cartItem.book.image }'/>"/></div></td>

<td>${cartItem.book.bname }</td>

<td>${cartItem.book.author }</td>

<td>${cartItem.book.price }元</td>

<td>${cartItem.count }</td>

<td>${cartItem.tatal }元</td>

<td><a href="<c:url value=" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" /CartServlet?method=delete&bid=${cartItem.book.bid }"/>">删除</a></td>

</tr>

</c:forEach>

<tr>

<td colspan="7" align="right" style="font-size: 15pt; font-weight: 900">

合计：${sessionScope.cart.total }元

</td>

</tr>

<tr>

<td colspan="7" align="right" style="font-size: 15pt; font-weight: 900">

<a id="buy" href="<c:url value='/jsps/order/desc.jsp'/>" target="_blank" rel="external nofollow" ></a>

</td>

</tr>

</table>

</c:otherwise>

</c:choose>