Cookie的使用
链接: https://pan.baidu.com/s/188chZLe-56VFzg7UvkZKUA
提取码: jvwb 复制这段内容后打开百度网盘手机App，操作更方便哦
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>记住密码登录</title> <!-- <script> function getCookie(name){ var arr,reg=new RegExp("(^| )"+name+"=([^;]*)(;|$)"); if(arr=document.cookie.match(reg)) return unescape(arr[2]); else return null; } </script> --> </head> <body> <form action="rLogin" method="post"> <input type="text" name="uid"><br> <input type="password" name="upassword"><br> <input type="checkbox" name="rememberMe" value="yes">记住我30天 <input type="submit" value="登录"> </form> </body> </html> Login.html
package com.a;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.validation.constraints.Null;
/**
* Servlet implementation class rLogin
*/
@WebServlet("/rLogin")
public class rLogin extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public rLogin() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//设置请求和响应的字符集编码
response.setContentType("text/html; charset=UTF-8");
request.setCharacterEncoding("UTF-8");
PrintWriter out = response.getWriter(); //获得输出流
String strID=request.getParameter("uid");
String strPassword=request.getParameter("upassword");
String isRemember=request.getParameter("rememberMe");
boolean isExist=false;
boolean isLogin=false;
//校验Cookie中有无登录名信息
Cookie[] cookies=request.getCookies();
if (cookies==null){
out.print("没有Cookie");
}
else {
for(int i=0;i<cookies.length;i++){
if(cookies[i].getName().equals("uid"));
isExist=true;
out.println("拥有Cookie");
}
}
//检查登录信息是否正确
if("tom".equals(strID)&&"123".equals(strPassword)){
isLogin=true;
}
//若已选择记住我且Cookie中无信息，则写入Cookie信息
if("yes".equals(isRemember)&&isExist==false&&isLogin==true){
Cookie user_id=new Cookie("uid", strID);
Cookie user_password=new Cookie("upassword", strPassword);
user_id.setMaxAge(60*60*24*30);
user_password.setMaxAge(60*60*24*30);
response.addCookie(user_id);
response.addCookie(user_password);
}
if(isExist&&!"yes".equals(isRemember)&&isLogin==false){
out.println("且登录失败");
}
//登录信息正确或Cookie中有数据，都可登录
else if(isExist||isLogin){
out.println("且成功登录");
}
else{
out.println("且登录失败");
}
}
}
servlet中dopost方法
