cookie的禁用

------------------------------- cookie的禁用-------------------------------------

Cookie的禁用处理

默认情况下浏览器的cookie是被启用的，但是其实我们是可以手动的禁用cookie的，强烈不建议禁用cookie

Cookie一旦被禁用掉绝大多数互联网的网站都无法登录，这个跟我们后续要讲解的session有关。

那么我们如何通过程序来通过程序判断用户的浏览器上的cookie是否被禁用了呢，其实很简单，我们可以通过去刚刚添加的cookie，如果没有取到，说明cookie被禁用。

Cookie cookie = new Cookie("username", username);       resp.addCookie(cookie);       Cookie [] cookies = req.getCookies();       boolean isExsit = false;       for(Cookie ck : cookies){          String name = ck.getName();          if("username".equals(name)){             isExsit = true;          }       }       if(!isExsit){          System.out.println("cookie被禁用了");       }

 

public class RegistServlet extends HttpServlet {          @Override        protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {               doPost(req, resp);        }               public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {               request.setCharacterEncoding("UTF-8");               //创建cookie               Cookie cookie = new Cookie("userpass", "cookie test");               //添加cookie               response.addCookie(cookie);                             //获取cookie               Cookie[] cookies = request.getCookies();               if(cookies != null){                      for (Cookie cookie2 : cookies) {                             String name = cookie2.getName();                             if("userpass".equals(name)){                                    String value = cookie2.getValue();                                    System.out.println(value);                             }                      }               }else{                      response.getWriter().print("cookie被禁用");               }               response.getWriter().print("success");        } }