Java如何实现玩具商城的前台与后台
Java如何实现玩具商城的前台与后台
发布时间:2022-01-04 19:58:35 来源:高防服务器网 阅读:97 作者:小新 栏目:开发技术
这篇文章将为大家详细讲解有关Java如何实现玩具商城的前台与后台,小编觉得挺实用的,因此分享给大家做个参考,希望大家阅读完这篇文章后可以有所收获。
一、项目简述
本系统主要实现的功能有:
网上商城系统,前台+后台管理,用户注册,登录,商品展示,分组展示,搜索,收货地址管理,购物车管理,添加,购买,个人信息修改。订单查询等等,后台商品管理,分类管理,库存管理,订单管理,用户管理,信息修改等等。
二、项目运行
环境配置:
Jdk1.8 + Tomcat8.5 + mysql + Eclispe(IntelliJ IDEA,Eclispe,MyEclispe,Sts都支持)
项目技术:
Springboot+ SpringMVC + MyBatis + Jsp + Html+ JavaScript + JQuery + Ajax + maven等等
后台管理代码:
@Controller public class IndexController { /** * 网站首页 * */ @GetMapping("/") public String index(){ return "/index"; } /** * 联系我们 * */ @GetMapping("/contacts") public String contacts(){ return "/common/contacts"; } /** * 关于我们 * */ @GetMapping("/about") public String about(){ return "/common/about"; } /** * 后台管理首页 * */ @GetMapping("/admin/index") public String adminindex(HttpSession session, HttpServletRequest request, HttpServletResponse response) throws IOException { String admin = (String) session.getAttribute("admin"); /**拦截器:如果不是管理员,则进行重定向*/ if (StringUtils.isEmpty(admin)){ response.sendRedirect(request.getContextPath() + "/");//重定向 } return "/admin/index"; } /** * 用户登录注册 * */ @GetMapping("/login") public String login(){ return "/user/logreg"; } /** * 用户忘记密码 * */ @GetMapping("/forget") public String forget(){ return "user/forget"; } /** * 个人中心 * */ @GetMapping("/user/center") public String usercenter(HttpSession session, HttpServletRequest request, HttpServletResponse response) throws IOException { String userid = (String) session.getAttribute("userid"); /**拦截器:如果不是用户角色登录,则进行重定向*/ if (StringUtils.isEmpty(userid)){ response.sendRedirect(request.getContextPath() + "/");//重定向 } return "/user/user-center"; } /** * 用户修改密码 * */ @RequiresPermissions("user:userinfo") @GetMapping("/user/pass") public String userinfo(){ return "/user/updatepass"; } /** * 用户更换手机号 * */ @RequiresPermissions("user:userinfo") @GetMapping("/user/phone") public String userphone(){ return "/user/updatephone"; } /** * 用户商品列表 * */ @GetMapping("/user/product") public String userproduct(){ return "/user/product/productlist"; } /** * 通知消息 * */ @GetMapping("/user/message") public String commonmessage(){ return "/user/message/message"; } /** * 弹出式通知消息 * */ @GetMapping("/user/alertmessage") public String alertmessage(){ return "/user/message/alertmessage"; } /** * 跳转到产品清单界面 * */ @GetMapping("/product-listing") public String toproductlisting() { return "/common/product-listing"; } /** * 跳转到产品清单搜索界面 * */ @GetMapping("/product-search") public String toProductSearchs(String keys, ModelMap modelMap) { if(keys==null){ return "/error/404"; } modelMap.put("keys",keys); return "/common/product-search"; } /**用户个人中心默认展示图*/ @GetMapping("/home/console") public String homeconsole(){ return "/admin/home/console"; } /** * 管理员首页默认展示图 * */ @GetMapping("/echars/console") public String echars(){ return "/admin/echars/console"; } @GetMapping("/app/message/index") public String appmessageindex(){ return "/admin/app/message/index"; } /** * 用户收藏列表 * */ @GetMapping("/user/collect") public String usercollect(){ return "/user/collect/collectlist"; } /** * 用户售出记录 * */ @GetMapping("/user/sold") public String sold(){ return "/user/sold/soldrecord"; } /** * 销量列表 * */ @GetMapping("/admin/sold") public String adminSold(){ return "/admin/sold/soldrecord"; } /** * 首页公告清单 * */ @GetMapping("/user/newslist") public String userNews(){ return "/common/listnews"; } /** * 管理员公告列表 * */ @GetMapping("/admin/newslist") public String adminNews(){ return "/admin/news/newslist"; } }
订单和商品服务类:
@WebServlet("/backstage_goodsServlet") public class GoodsServlet extends HttpServlet{ GoodsService service = new GoodsService(); @Override protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { String action = req.getParameter("action"); switch(action) { case "addGoods":addGoods(req,resp);break; case "getGoodsList":getGoodsList(req,resp);break; case "getGoodsListByName":getGoodsListByName(req,resp);break; case "deleteGoods":deleteGoods(req,resp);break; case "toGoodsUpdatePage":toGoodsUpdatePage(req,resp);break; case "updateGoods":updateGoods(req,resp);break; case "upGoodsImage":upGoodsImage(req,resp);break; case "fastbuy":sendOrder(req,resp);break; } } /** * 提交订单 * @throws IOException */ public void sendOrder(HttpServletRequest req, HttpServletResponse resp) throws IOException { //设置请求编码格式: req.setCharacterEncoding("utf-8"); //设置响应编码格式 resp.setContentType("text/html;charset=utf-8"); SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//设置日期格式 Orders order = new Orders(); order.setNumber(order.getRandomString(10)); order.setTime(df.format(new Date())); order.setName(req.getParameter("recipients")); order.setAddress(req.getParameter("address")); order.setPhone(req.getParameter("phone")); order.setAddress_label(req.getParameter("addressLabel")); order.setSex(req.getParameter("sex")); order.setUser("sjb"); order.setGoods_id(99); order.setGoods_num(3); order.setGoods_status(1); int d = service.addOrder(order); try { if(d>0) { JSONResult ok = JSONResult.ok(); resp.getWriter().println(JsonUtil.javaObjectToJson(ok)); }else { JSONResult error = JSONResult.errorMsg("订单提交失败!"); resp.getWriter().println(JsonUtil.javaObjectToJson(error)); } } catch (Exception e) { e.printStackTrace(); } } /** * 保存商品 * @throws IOException */ public void addGoods(HttpServletRequest req,HttpServletResponse resp) throws IOException { //设置请求编码格式: req.setCharacterEncoding("utf-8"); //设置响应编码格式 resp.setContentType("text/html;charset=utf-8"); FileUploadUtil upFile = new FileUploadUtil(); ServletContext servletContext = req.getSession().getServletContext(); List<FileItem> items= upFile.getRequsetFileItems(req,servletContext); //保存所有用户提交的 表单数据 的map Map<String, String> formData = new HashMap<>(); String savePath = new File(getServletContext().getRealPath("/")).getParentFile().getParentFile().getPath()+"/imgs"; try { //遍历 for (FileItem file : items) { if(!file.isFormField()) { String fileSuffix = FileUploadUtil.getFileSuffix(file).toUpperCase(); //必须是jpg或png 图片文件才能进行上传操作 if("JPG".equals(fileSuffix) || "PNG".equals(fileSuffix)) { //生成新图片名 String imgName = FileUploadUtil.getImgNewName(fileSuffix); FileUploadUtil.saveFile(file, savePath, imgName); formData.put("imgUrl",imgName); } }else { //非文件数据存入 formData.put(file.getFieldName(), file.getString("utf-8")); } } } catch (UnsupportedEncodingException e) { e.printStackTrace(); } Goods goods = new Goods(); goods.setName(formData.get("goodsName")); goods.setNum(Integer.parseInt(formData.get("num"))); goods.setPrice(Double.parseDouble(formData.get("price"))); goods.setImgurl(formData.get("imgUrl")); goods.setType(formData.get("type")); goods.setDescription(formData.get("description")); goods.setColor(formData.get("color")); goods.setMemory(formData.get("memory")); goods.setCreateDate(new SimpleDateFormat("yyyy-MM-dd").format(new Date())); int d = service.addGoods(goods); try { if(d>0) { JSONResult ok = JSONResult.ok(); resp.getWriter().println(JsonUtil.javaObjectToJson(ok)); }else { JSONResult errorMsg = JSONResult.errorMsg("添加失败,请重试"); resp.getWriter().println(JsonUtil.javaObjectToJson(errorMsg)); } } catch (Exception e) { e.printStackTrace(); } } /** * 向前端页面返回商品数据列表 */ public void getGoodsList(HttpServletRequest req,HttpServletResponse resp) { List<Goods> allGoods = service.getAllGoods(); req.setAttribute("goodsList", allGoods); try { req.getRequestDispatcher("/backstage/tgls/goodsManage/goods_list.jsp").forward(req, resp); } catch (ServletException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } /** * @throws IOException * 根据商品名查询商品 * @param req * @param resp * @throws */ public void getGoodsListByName(HttpServletRequest req,HttpServletResponse resp) throws IOException { //设置请求编码格式: req.setCharacterEncoding("utf-8"); //设置响应编码格式 resp.setContentType("text/html;charset=utf-8"); String name = req.getParameter("goodsName"); String type = req.getParameter("type"); Map<String,String> parmas = new HashMap<>(); parmas.put("name", name); parmas.put("type", type); List<Goods> list = service.getGoodsByName(parmas); try { if(list != null) { JSONResult ok = JSONResult.ok(list); resp.getWriter().println(JsonUtil.javaObjectToJson(ok)); }else { JSONResult errorMsg = JSONResult.errorMsg("未获取到任何数据,请重试"); resp.getWriter().println(JsonUtil.javaObjectToJson(errorMsg)); } } catch (Exception e) { e.printStackTrace(); } } /** * 修改商品时,获取此商品的全部数据,并返回至修改页面 */ public void toGoodsUpdatePage(HttpServletRequest req,HttpServletResponse resp) { int id = Integer.parseInt(req.getParameter("id")); Goods goods = service.getGoodsInfoById(id); req.setAttribute("goods", goods); try { req.getRequestDispatcher("/backstage/tgls/goodsManage/goods_update.jsp").forward(req, resp); } catch (ServletException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } /** *修改商品信息时,如果有修改图片,先将图片进行修改 * @throws IOException */ public void upGoodsImage(HttpServletRequest req,HttpServletResponse resp) throws IOException { //设置请求编码格式: req.setCharacterEncoding("utf-8"); //设置响应编码格式 resp.setContentType("text/html;charset=utf-8"); FileUploadUtil upFile = new FileUploadUtil(); ServletContext servletContext = req.getSession().getServletContext(); List<FileItem> items= upFile.getRequsetFileItems(req,servletContext); String savePath = new File(getServletContext().getRealPath("/")).getParentFile().getParentFile().getPath()+"/imgs"; String imgName = null; try { //遍历 for (FileItem file : items) { if(!file.isFormField()) { String fileSuffix = FileUploadUtil.getFileSuffix(file); //必须是jpg或png 图片文件才能进行上传操作 if("jpg".equals(fileSuffix) || "png".equals(fileSuffix)) { //生成新图片名 imgName = FileUploadUtil.getImgNewName(fileSuffix); FileUploadUtil.saveFile(file, savePath, imgName); } } } int d = service.updateGoodsImgById(imgName, Integer.parseInt(req.getParameter("id"))); if(d>0) { JSONResult ok = JSONResult.ok(imgName); resp.getWriter().println(JsonUtil.javaObjectToJson(ok)); }else { JSONResult errorMsg = JSONResult.errorMsg("修改失败,请重试"); resp.getWriter().println(JsonUtil.javaObjectToJson(errorMsg)); } } catch (Exception e) { e.printStackTrace(); } } /** * 修改商品 * @throws IOException */ public void updateGoods(HttpServletRequest req,HttpServletResponse resp) throws IOException { //设置请求编码格式: req.setCharacterEncoding("utf-8"); //设置响应编码格式 resp.setContentType("text/html;charset=utf-8"); Goods goods = new Goods(); goods.setId(Integer.parseInt(req.getParameter("id"))); goods.setName(req.getParameter("goodsName")); goods.setNum(Integer.parseInt(req.getParameter("num"))); goods.setPrice(Double.parseDouble(req.getParameter("price"))); goods.setType(req.getParameter("type")); goods.setColor(req.getParameter("color")); goods.setMemory(req.getParameter("memory")); goods.setDescription(req.getParameter("description")); int d = service.updateGoodsById(goods); try { if(d>0) { JSONResult ok = JSONResult.ok(); resp.getWriter().println(JsonUtil.javaObjectToJson(ok)); }else { JSONResult errorMsg = JSONResult.errorMsg("修改失败,请重试"); resp.getWriter().println(JsonUtil.javaObjectToJson(errorMsg)); } } catch (Exception e) { e.printStackTrace(); } } /** * 删除商品 * @throws IOException */ public void deleteGoods(HttpServletRequest req,HttpServletResponse resp) throws IOException { //设置请求编码格式: req.setCharacterEncoding("utf-8"); //设置响应编码格式 resp.setContentType("text/html;charset=utf-8"); int id = Integer.parseInt(req.getParameter("id")); int d = service.deleteGoodsById(id); try { if(d>0) { JSONResult ok = JSONResult.ok(); resp.getWriter().println(JsonUtil.javaObjectToJson(ok)); }else { JSONResult errorMsg = JSONResult.errorMsg("删除失败,请重试"); resp.getWriter().println(JsonUtil.javaObjectToJson(errorMsg)); } } catch (Exception e) { e.printStackTrace(); } } }
订单服务类:
@WebServlet("/backstage_ordersServlet") public class OrdersServlet extends HttpServlet{ OrdersService service = new OrdersService(); @Override protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { String action = req.getParameter("action"); System.out.println(action); switch(action) { case "getOrdersList":getOrdersList(req,resp);break; case "getOrdersListByName":getOrdersListByName(req,resp);break; case "deleteOrders":deleteOrders(req,resp);break; case "deleteAllOrders":deleteAllOrders(req,resp);break; case "toOrdersUpdatePage":toOrdersUpdatePage(req,resp);break; case "updateOrders":updateOrders(req,resp);break; case "fastbuy":sendOrder(req,resp);break; } } /* * 删除全部订单 */ private void deleteAllOrders(HttpServletRequest req, HttpServletResponse resp) throws IOException { //设置请求编码格式: req.setCharacterEncoding("utf-8"); //设置响应编码格式 resp.setContentType("text/html;charset=utf-8"); // TODO 自动生成的方法存根 int d = service.deleteAllOrders(); try { if(d>0) { JSONResult ok = JSONResult.ok(); resp.getWriter().println(JsonUtil.javaObjectToJson(ok)); }else { JSONResult errorMsg = JSONResult.errorMsg("删除失败,请重试"); resp.getWriter().println(JsonUtil.javaObjectToJson(errorMsg)); } } catch (Exception e) { e.printStackTrace(); } } /** * 提交订单 * @throws IOException */ public void sendOrder(HttpServletRequest req, HttpServletResponse resp) throws IOException { //设置请求编码格式: req.setCharacterEncoding("utf-8"); //设置响应编码格式 resp.setContentType("text/html;charset=utf-8"); SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//设置日期格式 User user =(User) req.getSession().getAttribute("user"); Orders order = new Orders(); order.setNumber(order.getRandomString(10)); order.setTime(df.format(new Date())); order.setName(req.getParameter("recipients")); order.setAddress(req.getParameter("address")); order.setPhone(req.getParameter("phone")); order.setAddress_label(req.getParameter("addressLabel")); order.setSex(req.getParameter("sex")); order.setUser(user.getUserName()); order.setGoods_id(Integer.parseInt(req.getParameter("id"))); order.setGoods_num(Integer.parseInt(req.getParameter("num"))); order.setGoods_status(1); int d = service.addOrder(order); try { if(d>0) { JSONResult ok = JSONResult.ok(); resp.getWriter().println(JsonUtil.javaObjectToJson(ok)); }else { JSONResult error = JSONResult.errorMsg("订单提交失败!"); resp.getWriter().println(JsonUtil.javaObjectToJson(error)); } } catch (Exception e) { e.printStackTrace(); } } /** * 向前端页面返回订单数据列表 */ public void getOrdersList(HttpServletRequest req,HttpServletResponse resp) { List<Orders> allOrders = service.getAllOrders(); req.setAttribute("ordersList",allOrders); try { req.getRequestDispatcher("/backstage/tgls/ordersManage/orders_list.jsp").forward(req, resp); } catch (ServletException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } /** * 根据订单名查询商品(注意!类别没改) * @param req * @param resp * @throws IOException */ public void getOrdersListByName(HttpServletRequest req,HttpServletResponse resp) throws IOException { //设置请求编码格式: req.setCharacterEncoding("utf-8"); //设置响应编码格式 resp.setContentType("text/html;charset=utf-8"); String name = req.getParameter("OrdersUser"); //String type = req.getParameter("type"); Map<String,String> parmas = new HashMap<>(); parmas.put("name", name); //parmas.put("type", type); List<Orders> list = service.getOrdersByName(parmas); try { if(list != null) { JSONResult ok = JSONResult.ok(list); resp.getWriter().println(JsonUtil.javaObjectToJson(ok)); }else { JSONResult errorMsg = JSONResult.errorMsg("未获取到任何数据,请重试"); resp.getWriter().println(JsonUtil.javaObjectToJson(errorMsg)); } } catch (Exception e) { e.printStackTrace(); } } /** * 修改订单时,获取此订单的全部数据,并返回至修改页面 */ public void toOrdersUpdatePage(HttpServletRequest req,HttpServletResponse resp) { int id = Integer.parseInt(req.getParameter("id")); Orders orders = service.getOrdersInfoById(id); req.setAttribute("orders", orders); try { req.getRequestDispatcher("/backstage/tgls/ordersManage/orders_update.jsp").forward(req, resp); } catch (ServletException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } /** * 修改订单 * @throws IOException */ public void updateOrders(HttpServletRequest req,HttpServletResponse resp) throws IOException { //设置请求编码格式: req.setCharacterEncoding("utf-8"); //设置响应编码格式 resp.setContentType("text/html;charset=utf-8"); Orders orders = new Orders(); orders.setId(Integer.parseInt(req.getParameter("id"))); orders.setNumber(req.getParameter("number")); orders.setUser(req.getParameter("user")); orders.setTime(req.getParameter("time")); orders.setName(req.getParameter("name")); orders.setSex(req.getParameter("sex")); orders.setAddress(req.getParameter("address")); orders.setPhone(req.getParameter("phone")); orders.setAddress_label(req.getParameter("address_label")); orders.setGoods_id(Integer.parseInt(req.getParameter("goods_id"))); orders.setGoods_num(Integer.parseInt(req.getParameter("goods_num"))); orders.setGoods_status(Integer.parseInt(req.getParameter("goods_status"))); System.out.println(orders); int d = service.updateOrdersById(orders); System.out.println(d); try { if(d>0) { JSONResult ok = JSONResult.ok(); resp.getWriter().println(JsonUtil.javaObjectToJson(ok)); }else { JSONResult errorMsg = JSONResult.errorMsg("修改失败,请重试"); resp.getWriter().println(JsonUtil.javaObjectToJson(errorMsg)); } } catch (Exception e) { e.printStackTrace(); } } /** * 删除订单 * @throws UnsupportedEncodingException */ public void deleteOrders(HttpServletRequest req,HttpServletResponse resp) throws UnsupportedEncodingException { //设置请求编码格式: req.setCharacterEncoding("utf-8"); //设置响应编码格式 resp.setContentType("text/html;charset=utf-8"); int id = Integer.parseInt(req.getParameter("id")); int d = service.deleteOrdersById(id); try { if(d>0) { JSONResult ok = JSONResult.ok(); resp.getWriter().println(JsonUtil.javaObjectToJson(ok)); }else { JSONResult errorMsg = JSONResult.errorMsg("删除失败,请重试"); resp.getWriter().println(JsonUtil.javaObjectToJson(errorMsg)); } } catch (Exception e) { e.printStackTrace(); } } }
用户服务类:
@WebServlet("/backstage_userServlet") public class UserServlet extends HttpServlet{ UserService service = new UserService(); @Override protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { String action = req.getParameter("action"); switch(action) { case "login":login(req, resp);break; case "modifyPassword":modifyPassword(req, resp);break; case "checkOldPassword":checkOldPassword(req, resp);break; case "afterModifyPassword":afterModifyPassword(req, resp);break; case "logout":logout(req, resp);break; } } /** * 用户登录 * @throws IOException */ public void login(HttpServletRequest req, HttpServletResponse resp) throws IOException { //设置请求编码格式: req.setCharacterEncoding("utf-8"); //设置响应编码格式 resp.setContentType("text/html;charset=utf-8"); //获取前端页面传来的用户名 String userName = req.getParameter("userName"); //获取前端页面传来的密码 String password = req.getParameter("password"); // 1、先验证该用户的角色是否为管理员 String userRole = service.getUserRoleByName(userName); try { if(!"admin".equals(userRole)) { JSONResult errorMsg = JSONResult.errorMsg("暂无登录权限"); resp.getWriter().println(JsonUtil.javaObjectToJson(errorMsg)); }else { //2、获取用户数据 进行用户名和密码验证 User user = service.getUserByNameAndPassword(userName, password); if(user!=null) { //将用户数据保存到session 作用域中,方便在后续的操作中使用用户数据 req.getSession().setAttribute("user", user); JSONResult ok = JSONResult.ok(); resp.getWriter().println(JsonUtil.javaObjectToJson(ok)); }else { // 将错误信息封装在结果集中 JSONResult result = JSONResult.errorMsg("用户名或密码错误,请重试"); //以json的形式返回给前端 resp.getWriter().println(JsonUtil.javaObjectToJson(result)); } } } catch (Exception e) { e.printStackTrace(); } } /** * 检查旧密码是否正确 ,在修改密码操作时使用 * @throws IOException */ public void checkOldPassword(HttpServletRequest req, HttpServletResponse resp) throws IOException { //设置请求编码格式: req.setCharacterEncoding("utf-8"); //设置响应编码格式 resp.setContentType("text/html;charset=utf-8"); User user =(User) req.getSession().getAttribute("user"); String oldPassword = service.getPasswordById(user.getId()); String password = req.getParameter("password"); try { if(!oldPassword.equals(password)) { JSONResult errorMsg = JSONResult.errorMsg("原始密码错误,请重新输入"); resp.getWriter().println(JsonUtil.javaObjectToJson(errorMsg)); }else { JSONResult ok = JSONResult.ok(); resp.getWriter().println(JsonUtil.javaObjectToJson(ok)); } } catch (IOException e) { e.printStackTrace(); } } /** * 修改密码 * @throws IOException */ public void modifyPassword(HttpServletRequest req, HttpServletResponse resp) throws IOException { //设置请求编码格式: req.setCharacterEncoding("utf-8"); //设置响应编码格式 resp.setContentType("text/html;charset=utf-8"); String password = req.getParameter("newPassword"); User user =(User) req.getSession().getAttribute("user"); int id = user.getId(); int d = service.updatePasswordById(id, password); try { if(d>0) { JSONResult ok = JSONResult.ok(); resp.getWriter().println(JsonUtil.javaObjectToJson(ok)); }else { JSONResult errorMsg = JSONResult.errorMsg("修改失败,请重试"); resp.getWriter().println(JsonUtil.javaObjectToJson(errorMsg)); } } catch (Exception e) { e.printStackTrace(); } } /** * 成功修改密码后,清除session中的数据,并且重新跳转到登录页 * @param req * @param resp */ public void afterModifyPassword(HttpServletRequest req, HttpServletResponse resp) { req.getSession().removeAttribute("user"); try { //使用iframe时,要避免这种直接跳转的方式 // 此时只会让内嵌的iframe跳转到登录页,并非整个页面 // resp.sendRedirect("backstage/login.jsp"); PrintWriter writer = resp.getWriter(); writer.print("<html>"); writer.print("<script>"); writer.print("window.open('"+ req.getContextPath()+"/backstage/login.jsp','_top')"); writer.print("</script>"); writer.print("</html>"); } catch (IOException e) { e.printStackTrace(); } } /** * 退出登录 */ public void logout(HttpServletRequest req, HttpServletResponse resp) { req.getSession().removeAttribute("user"); try { resp.sendRedirect("backstage/login.jsp"); } catch (IOException e) { e.printStackTrace(); } } }
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