本文实例为大家分享了servlet Cookie的使用方法，供大家参考，具体内容如下
1.cookie介绍
Cookie，指某些网站为了辨别用户身份、进行 session 跟踪而储存在用户本地终端上的数据（通常经过加密）。（可以叫做浏览器缓存）
2.cookie案例
servlet 源码
package com.learn;
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;
/**
*
*/
public class CookieServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//cookie引用
Cookie cookie = null;
//设置返回类型为文本类型
resp.setContentType("text/plain");
//获取输出对象
PrintWriter out = resp.getWriter();
//从请求参数中获取cookies
Cookie[] cookies = req.getCookies();
if(cookies != null){
for (int i = 0; i < cookies.length ; i++) {
out.println("name:"+cookies[i].getName());
out.println("value:"+cookies[i].getValue());
//如果cookie值为user，则赋值给cookie
if(cookies[i].getName().equals("user")){
cookie = cookies[i];
}
}
} else {
out.print("no cookie");
}
if(cookie == null){
cookie = new Cookie("user","tom");
//设置cookie最大值为60分钟
cookie.setMaxAge(60*60);
resp.addCookie(cookie);
} else if(cookie.getValue().equals("tom")){
cookie.setValue("jack");
resp.addCookie(cookie);
} else if(cookie.getValue().equals("jack")){
cookie.setMaxAge(0);
resp.addCookie(cookie);
}
out.close();
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
super.doPost(req, resp);
}
}
web,xml 配置
<servlet> <servlet-name>cookie</servlet-name> <servlet-class>com.learn.CookieServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>cookie</servlet-name> <url-pattern>/cookie</url-pattern> </servlet-mapping>
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。
