Cookie记录访问网站的时间

Cookie记录访问网站的时间

1.Cookie

  @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
   req.setCharacterEncoding("utf-8");
        resp.setCharacterEncoding("utf-8");//设置编码格式
        resp.setContentType("Text/html;charset=utf-8");
        PrintWriter out = resp.getWriter();
        Cookie[] cookies = req.getCookies(); //Cookie存在多个 是否存在  创建Cookie
        if(cookies!=null){
            out.write("上一次访问时间是：");
            for(int i =0;i<cookies.length;i++){
                Cookie cookie = cookies[i];
                if(cookie.getName().equals("lastLoginTime")){  //获取Cookie
                  Long lastLoginTime= Long.parseLong(cookie.getValue());
                    Date date = new Date(lastLoginTime);//打印访问时间
                    out.write(date.toLocaleString());
                }
            }
        }else{
            out.write("第一次访问");
        }
        Cookie cookie = new Cookie("lastLoginTime",System.currentTimeMillis()+"");
        resp.addCookie(cookie);

}

2.配置web.xml

 <servlet>
    <servlet-name>image</servlet-name>
    <servlet-class>com.ws.Servlet.testyanzhengma</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>image</servlet-name>
    <url-pattern>/image</url-pattern>
  </servlet-mapping>

3.记得导入依赖

  <dependencies>
  <dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>4.11</version>
    <scope>test</scope>
  </dependency>
  <dependency>
    <groupId>javax.servlet.jsp</groupId>
    <artifactId>javax.servlet.jsp-api</artifactId>
    <version>2.3.3</version>
    <scope>provided</scope>
  </dependency>
  <!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
  <dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>javax.servlet-api</artifactId>
    <version>4.0.1</version>
    <scope>provided</scope>
  </dependency>
</dependencies>

4.测试内容

• 需要访问两次cookies
• 第一次时记录时间 第二次才能打印出来上一次的时间

测试结果

Cookie是存放在客户端的浏览器上面，在本地可以查看。

5.来源

1.使用的TomCat9.0.62版本
2.来自狂神视频的学习