Cookie应用测试

### Cookie应用测试

用Cookie**获得上次访问时间**

```java
public class Cookie_01 extends HttpServlet {
    @Override
    //保存用户上一次访问的时间
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.setContentType("text/html");
        resp.setCharacterEncoding("utf-8");
        PrintWriter writer = resp.getWriter();
        Cookie[] cookies = req.getCookies();
        if(cookies !=null)
        {
              writer.print("你上一次访问的时间是");
            for (int i = 0; i < cookies.length; i++) {
               Cookie C= cookies[i];
               //获取名字
                if(C.getName().equals("TIME"))
                {
                    long l = Long.parseLong(C.getValue());
                    Date date = new Date(l);
                    writer.print(date.toLocaleString());
                }
            }
        }   else
        {
            writer.print("第一次访问");
        }
        //服务器给客户端相应cookie
        Cookie cookie = new Cookie("TIME",System.currentTimeMillis()+"");
        resp.addCookie(cookie);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        super.doPost(req, resp);
    }
}