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);
}
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持毛票票。