2016-java基础篇-servlet-cookies

来源：互联网发布：java实训日志编辑：程序博客网时间：2024/06/05 04:19

写入cookies：

package com.tsinghuas; import javax.servlet.http.*;import java.io.*;import java.sql.*;public class CookieTest1 extends HttpServlet{public void doGet(HttpServletRequest req,HttpServletResponse res){try{res.setContentType("text/html;charset=gbk");PrintWriter pw = res.getWriter();//Cookie myCookie = new Cookie("color1","red");myCookie.setMaxAge(30);res.addCookie(myCookie);pw.println("已经创建了cookie");}catch(Exception e){e.printStackTrace();}finally{}}public void doPost(HttpServletRequest req,HttpServletResponse res){this.doGet(req,res);} }

从cookies中读取

package com.tsinghuas; import javax.servlet.http.*;import java.io.*;import java.sql.*;public class CookieTest2 extends HttpServlet{public void doGet(HttpServletRequest req,HttpServletResponse res){try{res.setContentType("text/html;charset=gbk");PrintWriter pw = res.getWriter();Cookie[] allCookies=req.getCookies();int i=0;if(allCookies!=null){for(i=0;i<allCookies.length;i++){Cookie temp = allCookies[i];if(temp.getName().equals("color1")){String val = temp.getValue();pw.println("color1="+val);break;}}if(allCookies.length==i){pw.println("cookie 过期");}}else{pw.println("不存在cookie，或者过期");}}catch(Exception e){e.printStackTrace();}finally{}}public void doPost(HttpServletRequest req,HttpServletResponse res){this.doGet(req,res);} }

0 0