day11-功能实现10
家居网购项目实现010
以下皆为部分代码,详见 https://github.com/liyuelian/furniture_mall.git
24.bugFix-添加购物车按钮动态处理
24.1需求分析/图解
- 如某个家居的库存量为0,前台的“add to cart”按钮显示为“暂时缺货”
- 后台也要求添加校验,只有在库存>0时,才能添加到购物车
24.2代码实现
-
修改customer/index.jsp
-
CartServlet添加判断,如果在添加购物车时,该家居库存为0,就停止业务
24.3完成测试
25.功能23-附加功能-订单管理
25.1需求分析/图解
点击订单管理,前往order.jsp页面进行订单管理
点击详情的眼睛图标,可以显示该订单详情,即显示某个订单的所有订单项
25.2思路分析
点击订单管理按钮,跳转到订单管理页面order.jsp。根据用户id,在订单管理页面中显示用户对应的订单。点击订单详情,跳转到order_detail.jsp中,根据订单号显示订单所有项。
25.3代码实现
25.3.1dao层
OrderDAO
/**
* 根据用户id,查询该用户的所有订单Order
*
* @param id 用户id
* @return 返回订单
*/
public List<Order> queryOrderByMemberId(int id);
OrderDAOImpl
@Override
public List<Order> queryOrderByMemberId(int id) {
String sql = "SELECT `id`,`create_time` AS createTime,`price`,`status`,`member_id` AS memberId " +
"FROM `order` " +
"WHERE `member_id`=?";
return queryMulti(sql, Order.class, id);
}
test包-OrderDAOImplTest
@Test
public void queryOrderByMemberId() {
List<Order> orders = orderDAO.queryOrderByMemberId(2);
for (Order order : orders) {
System.out.println(order);
}
}
OrderItemDAO
/**
* 根据订单id-orderId查询对应的表单项orderItem
*
* @param orderId 订单id
* @return 返回表单项orderItem
*/
public List<OrderItem> queryOrderItemByOrderId(String orderId);
OrderItemDAOImpl
@Override
public List<OrderItem> queryOrderItemByOrderId(String orderId) {
String sql =
"SELECT `id`,`name`,`price`,`count`,`total_price` AS totalPrice,`order_id` AS orderId " +
"FROM `order_item` " +
"WHERE `order_id`=?";
return queryMulti(sql, OrderItem.class, orderId);
}
OrderItemDAOImplTest
@Test
public void queryOrderItemByOrderId() {
List<OrderItem> orderItems = orderItemDAO.queryOrderItemByOrderId("16722358644142");
for (OrderItem orderItem : orderItems) {
System.out.println(orderItem);
}
}
25.3.2service层
OrderService
/**
* 根据用户id返回订单order
* @param id 用户id
* @return 订单
*/
public List<Order> queryOrderByMemberId(int id);
/**
* 根据订单id返回对应的订单项orderItem
* @param orderId 订单id
* @return 返回订单项
*/
public List<OrderItem> queryOrderItemByOrderId(String orderId);
OrderServiceImpl
@Override
public List<Order> queryOrderByMemberId(int id) {
return orderDAO.queryOrderByMemberId(id);
}
@Override
public List<OrderItem> queryOrderItemByOrderId(String orderId) {
return orderItemDAO.queryOrderItemByOrderId(orderId);
}
test包-OrderServiceImpl
@Test
public void queryOrderByMemberId() {
List<Order> orders = orderService.queryOrderByMemberId(3);
for (Order order : orders) {
System.out.println(order);
}
}
@Test
public void queryOrderItemByOrderId() {
List<OrderItem> orderItems = orderService.queryOrderItemByOrderId("16722370522643");
for (OrderItem orderItem : orderItems) {
System.out.println(orderItem);
}
}
25.3.3web层
OrderServlet,增加两个方法
/**
* 显示订单order
*
* @param req
* @param resp
* @throws ServletException
* @throws IOException
*/
protected void showOrder(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//获取当前用户id
Member member = (Member) req.getSession().getAttribute("member");
if (member == null) {
//重定向到登录页面
resp.sendRedirect(req.getContextPath() + "/views/member/login.jsp");
return;
}
int id = DataUtils.parseInt(member.getId().toString(), 0);
//根据用户id查询对应的订单
List<Order> orders = orderService.queryOrderByMemberId(id);
//将订单数据返回显示
req.setAttribute("orders", orders);
//请求转发到order.jsp显示
req.getRequestDispatcher("/views/order/order.jsp").forward(req, resp);
}
/**
* 显示订单项orderItem
*
* @param req
* @param resp
* @throws ServletException
* @throws IOException
*/
protected void showOrderItem(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//获取当前orderid
String orderId = req.getParameter("orderId");
//根据orderId返回对应的订单项orderItem
List<OrderItem> orderItems = orderService.queryOrderItemByOrderId(orderId);
//计算该order中所有orderItem的总商品数量和总价格
Integer totalCount = 0;
BigDecimal totalPrice = BigDecimal.valueOf(0);
for (OrderItem orderItem : orderItems) {
totalCount += orderItem.getCount();
totalPrice = totalPrice.add(orderItem.getTotalPrice());
}
System.out.println("totalCount=>" + totalCount);
System.out.println("totalPrice=>" + totalPrice);
//将订单项数据返回显示
//订单id
req.setAttribute("orderId", orderId);
//订单商品总数
req.setAttribute("totalCount", totalCount);
//订单商品总额
req.setAttribute("totalPrice", totalPrice);
//订单项
req.setAttribute("orderItems", orderItems);
//请求转发到order_detail.jsp
req.getRequestDispatcher("/views/order/order_detail.jsp").forward(req, resp);
}
25.3.4前端页面修改
略
25.4完成测试
用户只有在登录情况下但能进入订单管理
点击详情的眼睛图案,即可查看该订单详情
26.功能24-过滤器权限验证
26.1需求分析/图解
- 加入过滤器权限验证,如果没有登录,查看购物车和添加到购物车时,页面将自动转到登录页面
- 除了购物车,网页还有很多这样的操作,都需要先登录才能使用。
- 比如,查看购物车页面,访问管理员manage目录下的jsp,还有Servlet等都需要先登录后才能访问。
26.2思路分析
26.3代码实现
web.xml中配置过滤器
<filter>
<filter-name>AuthFilter</filter-name>
<filter-class>com.li.furns.filter.AuthFilter</filter-class>
<init-param>
<!--这里配置之后,还需要在过滤器中编写规则放行-->
<param-name>excludedUrls</param-name>
<param-value>/views/manage/manage_login.jsp,/views/member/login.jsp</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>AuthFilter</filter-name>
<!--配置过滤器匹配url
1.在url-pattern中配置要拦截的url
2.需要拦截的url中也要分情况考虑,
比如/views/manage/下除了manage_login.jsp外都要拦截
对于这种在被拦截目录下但又需要放行的资源,我们可以在init-param中配置指定
-->
<url-pattern>/views/cart/*</url-pattern>
<url-pattern>/views/manage/*</url-pattern>
<url-pattern>/views/member/*</url-pattern>
<url-pattern>/views/order/*</url-pattern>
<url-pattern>/cartServlet</url-pattern>
<url-pattern>/manage/furnServlet</url-pattern>
<url-pattern>/orderServlet</url-pattern>
</filter-mapping>
AuthFilter
package com.li.furns.filter;
import com.li.furns.entity.Member;
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
import java.util.Arrays;
import java.util.List;
/**
* 这是用于权限验证的过滤器,对指定的url进行验证
* 如果登录过,就放行;如果没有登录,就返回登录页面
*
* @author 李
* @version 1.0
*/
public class AuthFilter implements Filter {
//后面我们把要排除的url放入到excludedUrls中
private List<String> excludedUrls;
public void init(FilterConfig config) throws ServletException {
//获取到配置的excludedUrls
String strExcludedUrls = config.getInitParameter("excludedUrls");
//进行分割
String[] splitUrl = strExcludedUrls.split(",");
//将splitUrl转成List,赋给excludedUrls
excludedUrls = Arrays.asList(splitUrl);
System.out.println("excludedUrls=>" + excludedUrls);
}
public void destroy() {
}
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws ServletException, IOException {
//权限验证
HttpServletRequest req = (HttpServletRequest) request;
//得到请求的url
String url = req.getServletPath();
//判断是否要验证
if (!excludedUrls.contains(url)) {//如果url不在配置的规则中,就进行校验
//得到session中的member对象
Member member = (Member) req.getSession().getAttribute("member");
if (member == null) {//说明用户没有登录过
//转发到登录页面
//不要使用重定向,因为重定向的url符合过滤器规则时也会被拦截,
//如果设置不合理就会出现 请求无线循环重定向的 情况
req.getRequestDispatcher("/views/member/login.jsp").forward(request, response);
return;//返回
}
}
//否则就放行
chain.doFilter(request, response);
}
}
我们在用户登录时给用户的session中放了一个member对像,方便显示用户信息,同时也方便过滤器处理。因为之前我们是将管理员和用户分开的,因此管理员登录的处理在AdminServlet中。为了方便过滤,这里将admin的登录和member的登录都放到MemberServlet中进行,即不再将管理员和用户视为两张表。
MemberServlet.login()
/**
* 处理会员和管理员的登录业务
*
* @param request
* @param response
* @throws ServletException
* @throws IOException
*/
public void login(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//1.接收用户名和密码
//如果前端输入的是null,后台接收的数据为空串""
String username = request.getParameter("username");
String password = request.getParameter("password");
//2.调用MemberServiceImpl的login方法
Member member = memberService.login(new Member(null, username, password, null));
if (member == null) {//数据库中没有该用户,返回登录页面
//登录失败,将错误信息和登录会员名放入request域中
request.setAttribute("errInfo", "登录失败,用户名或者密码错误");
request.setAttribute("username", username);
//注意路径
request.getRequestDispatcher("/views/member/login.jsp")
.forward(request, response);
} else {//登录成功
//创建session,将jsessionid作为cookie返回给浏览器
HttpSession session = request.getSession();
session.setMaxInactiveInterval(1800);//设置生命周期为30分钟
//将得到的member对象放入session域对象中
session.setAttribute("member", member);
if ("admin".equals(member.getUsername())) {
//跳转到登录成功页面
request.getRequestDispatcher("/views/manage/manage_menu.jsp")
.forward(request, response);
} else {
//跳转到登录成功页面
request.getRequestDispatcher("/views/member/login_ok.jsp")
.forward(request, response);
}
}
}
26.4完成测试
-
在首页点击add to cart
因为该按钮实际上向cartServlet发出请求,因此被拦截,根据filter编写的逻辑请求转发到用户登录页面
2.在url地址栏直接访问管理员登录页面manage_login.jsp
该页面也处于被拦截的url中,但是当filter拦截后,发现该url在配置的excludedUrls中,根据编写的逻辑,会直接放行,因此可以访问到
管理员登录后,可以正常访问manage目录下的资源