目录
Cookie 禁用处理
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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。
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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。
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以上操作完整源码
web.xml<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <servlet> <servlet-name>RegistServlet</servlet-name> <servlet-class>com.wyx.cookie.RegistServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>RegistServlet</servlet-name> <url-pattern>/servlet/RegistServlet</url-pattern> </servlet-mapping> </web-app>
RegistServlet
package com.wyx.cookie; import java.io.IOException; import java.net.URLDecoder; import java.net.URLEncoder; import javax.servlet.ServletException; import javax.servlet.http.Cookie; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class RegistServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { doPost(req, resp); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { // 创建cookie Cookie cookie = new Cookie("userpass", "cookie test ..."); // 添加cookie resp.addCookie(cookie); String result = null; // 获取刚刚存储的cookie Cookie[] cookies = req.getCookies(); if (cookies != null) { for (Cookie ck : cookies) { String name = ck.getName(); if ("userpass".equals(name)) { String value = ck.getValue(); result = value; } } } System.out.println(result); resp.getWriter().print("success"); } }
如有错误,欢迎指正!