JAVAEE中用Session简单实现购物车功能示例代码
Session简单实现购物车功能
这个小程序主要就3个页面,一个商品列表页面(HomeServlet),一个是提示加入购物车页面(AddCartTipServlet),一个是显示购物车清单页面(ShowCartServlet)。
HomeServlet页面:
@WebServlet({"/HomeServlet","/home"}) publicclassHomeServletextendsHttpServlet{ privatestaticfinallongserialVersionUID=1L; publicHomeServlet(){ super(); } protectedvoiddoGet(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{ request.setCharacterEncoding("utf-8"); response.setContentType("text/html;charset=utf-8"); PrintWriterout=response.getWriter(); out.print("<h2>书单</h2><hr/><br/>"); out.print("人类简史<ahref='"+request.getContextPath()+"/addCartTip?id=1'>加入购物车</a><br/>"); out.print("未来简史<ahref='"+request.getContextPath()+"/addCartTip?id=2'>加入购物车</a><br/>"); out.print("世界简史<ahref='"+request.getContextPath()+"/addCartTip?id=3'>加入购物车</a><br/>"); out.print("时间简史<ahref='"+request.getContextPath()+"/addCartTip?id=4'>加入购物车</a><br/>"); out.print("<ahref='"+request.getContextPath()+"/show/cart'>查看购物车</a><br/>"); } protectedvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{ doGet(request,response); } }
AddCartTipServlet页面:
@WebServlet({"/AddCartTipsServlet","/addCartTip"}) publicclassAddCartTipsServletextendsHttpServlet{ privatestaticfinallongserialVersionUID=1L; publicAddCartTipsServlet(){ super(); } protectedvoiddoGet(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{ request.setCharacterEncoding("utf-8"); response.setContentType("text/html;charset=utf-8"); HttpSessionsession=request.getSession(); List<String>list=(List<String>)session.getAttribute("cart"); if(list==null){ list=newArrayList<>(); } Stringid=request.getParameter("id"); list.add(id); session.setAttribute("cart",list); System.out.println(list.toString()); response.getWriter().println("已加入购物车<br/>" +"<ahref='"+request.getContextPath()+"/home'>继续购物</a><br/>" +"<ahref='"+request.getContextPath()+"/show/cart'>查看购物车</a><br/>"); } protectedvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{ doGet(request,response); } }
ShowCartSevlet页面
@WebServlet({"/ShowCartServlet","/show/cart"}) publicclassShowCartServletextendsHttpServlet{ privatestaticfinallongserialVersionUID=1L; publicShowCartServlet(){ super(); } protectedvoiddoGet(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{ request.setCharacterEncoding("utf-8"); response.setContentType("text/html;charset=utf-8"); PrintWriterout=response.getWriter(); List<String>list=(List<String>)request.getSession().getAttribute("cart"); if(list!=null){ out.print("你的购物清单:<br/>"); for(Stringstring:list){ out.println(DBUtils.findById(string)+"<br/>"); } out.println("<br/><ahref='"+request.getContextPath()+"/home'>继续购物</a><br/>"); }else{ out.println("你还没有将商品添加到购物车<br/>" +"<ahref='"+request.getContextPath()+"/home'>返回商品列表</a><br/>"); } } protectedvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{ doGet(request,response); } }
DBUtils:存储着商品信息
publicclassDBUtils{ privatestaticMap<String,String>map=newHashMap<>(); static{ map.put("1","人类简史"); map.put("2","未来简史"); map.put("3","世界简史"); map.put("4","时间简史"); } publicstaticStringfindById(Stringid){ returnmap.get(id); } }
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