cookie使用

java页面

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package com.yin;   import javax.servlet.ServletException; import javax.servlet.http.Cookie; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; import java.io.PrintWriter; import java.util.Date;   public class CookieDemo extends HttpServlet {     @Override     protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {         req.setCharacterEncoding("UTF-8");         resp.setCharacterEncoding("UTF-8");         resp.setContentType("text/html;charset=utf-8");           PrintWriter out =resp.getWriter();         Cookie[] cookies=req.getCookies();           if(cookies!=null){             out.write("你上次访问时间:");               for (int i = 0; i <cookies.length ; i++) {                 Cookie cookie=cookies[i];                   if(cookie.getName().equals("lastLoginTime")){                     long lastLogintime=Long.parseLong(cookie.getValue());                     Date date=new Date(lastLogintime);                     out.write(date.toLocaleString());                 };             }         }         else{             out.write("你这是第一次访问本站");         }           Cookie cookie=new Cookie("lastLoginTime",System.currentTimeMillis()+"");         cookie.setMaxAge(24*60*60);         resp.addCookie(cookie);       }       @Override     protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {         doGet(req, resp);     } }

　　XML添加路径

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<servlet>     <servlet-name>name</servlet-name>     <servlet-class>com.yin.CookieDemo</servlet-class> </servlet> <servlet-mapping>     <servlet-name>name</servlet-name>     <url-pattern>/cook</url-pattern> </servlet-mapping>

　　查看运行情况

 

 

package com.yin;

import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Date;

public class CookieDemo extends HttpServlet {
    @Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        req.setCharacterEncoding("UTF-8");
resp.setCharacterEncoding("UTF-8");
resp.setContentType("text/html;charset=utf-8");

PrintWriter out =resp.getWriter();
Cookie[] cookies=req.getCookies();

        if(cookies!=null){
            out.write("你上次访问时间:");

            for (int i = 0; i <cookies.length ; i++) {
                Cookie cookie=cookies[i];

                if(cookie.getName().equals("lastLoginTime")){
                    long lastLogintime=Long.parseLong(cookie.getValue());
Date date=new Date(lastLogintime);
out.write(date.toLocaleString());
};
}
        }
        else{
            out.write("你这是第一次访问本站");
}

        Cookie cookie=new Cookie("lastLoginTime",System.currentTimeMillis()+"");
cookie.setMaxAge(24*60*60);
resp.addCookie(cookie);

}

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