??????? //將商品編號保存在Cookie對象中?? ??? ?String list=""; //list作為Cookie對象的值，shopId作為鍵???????? ??? ?Cookie [] cookies = request.getCookies();? //首先，遍歷瀏覽器中的cookie，如果有上次的cookie值，則取出再次追加當前瀏覽的商品id，和一個逗號.(用來在業務層分割出瀏覽過的商品id數組)???????? ??? ?if(cookies!=null&&cookies.length>0){???????? ??? ??? ?for(Cookie c:cookies){???????? ??? ??? ??? ?if(c.getName().equals("shopId")){???????? ??? ??? ??? ??? ?list += c.getValue();???????? ??? ??? ??? ?}???????? ??? ??? ?}???????? ??? ?}???????? ??? ????????? ??? ?list += request.getParameter("id")+",";???????? ??? ?Cookie cookie = new Cookie("shopId",list);???????? ??? ?response.addCookie(cookie); //測試了幾遍，就是這行代碼出錯，去掉則可以正常運行，但是無法使用cookie保存記錄。加上這行代碼卻又拋出異常，顯示為Cookie Value中加入了invalid character（無效字符）