18jsp实现-登录状态响应，商品列表展示---el&jstl

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代码实现--登录状态和商品列表展示

1登录

LoginServlet

//只获取用户名，不获取密码验证等等
		String username = request.getParameter("username");
		
		request.getSession().setAttribute("username", username);
		response.sendRedirect(request.getContextPath()+"/productList");


	<form action="/WEB18/loginServlet" method="post">
    	账号：<input type="text" name="username"><br>
    	密码：<input type="password" name="password"><br>
    	<input type="submit" value="提交">
    	
    </form>

header.jsp

<div class="col-md-3" style="padding-top:20px">
		<ol class="list-inline">
			<c:if test="${empty username}">
				<li><a href="login.jsp">登录</a></li>
				<li><a href="register.jsp">注册</a></li>
			</c:if>
			<c:if test="${!empty username}">
				<li>${username}</li>
				<li><a href="#">退出</a></li>
			
			</c:if>
			
			<li><a href="cart.jsp">购物车</a></li>
			<li><a href="order_list.jsp">我的订单</a></li>
		</ol>
	</div>

2,商品列表product

ProductListServlet

QueryRunner runner = new QueryRunner(DataSourceUtils.getDataSource());
		String sql = "select * from product";
		List<Product> productList = runner.query(sql, new BeanListHandler<Product>(Product.class));

request.setAttribute("productList", productList);
		request.getRequestDispatcher("/product_list.jsp").forward(request, response);

product_list.jsp

<!-- 引入header.jsp -->
	<jsp:include page="/header.jsp"></jsp:include>


	<div class="row" style="width: 1210px; margin: 0 auto;">
		
		
		<c:forEach items="${productList}" var="product">
			<div class="col-md-2" style="height: 250px">
			<a href="product_info.htm">
			 <img src="${pageContext.request.contextPath }/${product.pimage }" width="170" height="170" style="display: inline-block;">
			</a>
			<p>
				<a href="product_info.html" style='color: green'>${product.pname }</a>
			</p>
			<p>
				<font color="#FF0000">商城价：&yen;${product.shop_price }</font>
			</p>
		</div>
		
		</c:forEach>

要配置jstl架包

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>

18jsp实现-登录状态响应，商品列表展示---el&jstl

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