用Cookie实现一天免登录功能
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Servlet程序:
package com.westos.untitle2;
import com.westos.untitle2.CityService.UserService;
import com.westos.untitle2.bean.User;
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 java.io.IOException;
import java.util.List;
@WebServlet(name = "Cookie4Servlet")
public class Cookie4Servlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request,response);
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setCharacterEncoding("utf-8");
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
String username=request.getParameter("username");
String password=request.getParameter("password");
UserService userService=new UserService();
List<User> list=userService.setUser();
if (username==null||password==null){
Cookie[] cookie=request.getCookies();
for (Cookie c:cookie){
if(c.getName().equals("username")){
username=c.getValue();
}else if(c.getName().equals("password")){
password=c.getValue();
}
}
}
if(username.equals("")||password.equals("")){
request.getRequestDispatcher("login2.html").forward(request,response);
}else{
for(User user:list){
if(user.getUsername().equals(username)&&user.getPassword().equals(password)){
Cookie cookie1=new Cookie("username",username);
Cookie cookie2=new Cookie("password",password);
cookie1.setMaxAge(60*60);
cookie2.setMaxAge(60*60);
response.addCookie(cookie1);
response.addCookie(cookie2);
request.getRequestDispatcher("success.html").forward(request,response);
}else{
request.getRequestDispatcher("login2.html").forward(request,response);
}
}
}
}
}登录页面程序:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>登录</title>
</head>
<body>
<form action="./cookie4" method="Post" name="login">
昵称:<input name="username" type="text" placeholder="请输入昵称" id="nicheng"/><br/><br/>
密码:<input name="password" type="password" placeholder="请输入密码" id="mima"/><br/><br/>
请输入验证码:<br/>
<img src="./yzm01" height="32" id="myyzm">
<button type="button" value="看不清楚,再来一张" onclick="identifyload()">看不清楚,再来一张</button>
<input name="yzm01" type="text"/><br/>
<button type="submit" value="登录" >登录</button>
<button type="reset" value="重置">重置</button>
</form>
</body>
</html>User:
public class User {
private String Username;
private String password;
public String getUsername() {
return Username;
}
public String getPassword() {
return password;
}
public void setUsername(String username) {
Username = username;
}
public void setPassword(String password) {
this.password = password;
}
}UserService:
package com.westos.untitle2.CityService;
import com.westos.untitle2.bean.User;
import sun.rmi.log.LogInputStream;
import java.util.ArrayList;
import java.util.List;
public class UserService {
public List<User> setUser(){
List<User> list=new ArrayList<>();
User u1=new User();
u1.setUsername("Bighead");
u1.setPassword("4214963");
list.add(u1);
User u2=new User();
u2.setUsername("lyy");
u2.setPassword("0829");
list.add(u2);
return list;
}
}success.html程序,自己根据需求设置.
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