javaweb会话技术

cookie的入门使用

package com.hspedu.cookie;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;/*** 演示如何创建cookie,并保存到浏览器*/
public class CreateCookie extends HttpServlet {protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {System.out.println("CreateCookie 被调用...");//1. 创建一个Cookie对象//老韩解读//1) username 该cookie的名字 是唯一, 可以理解成是key//2) hsp : 该cookie的值//3) 可以创建多个cookie，老师就创建了一个//4) 这是cookie在服务器端, 还没有到浏览器Cookie cookie = new Cookie("username", "tom");Cookie cookie2 = new Cookie("email", "[e-mail]");response.setContentType("text/html;charset=utf-8");//2. 将cookie发送给浏览器, 让浏览器将该cookie保存response.addCookie(cookie);response.addCookie(cookie2);PrintWriter writer = response.getWriter();writer.println("<h1>创建cookie成功~</h1>");writer.flush();writer.close();}protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {doPost(request, response);}
}