springboot如何通过session实现单点登入详解

springboot如何通过session实现单点登入详解

目录我对于单点的理解效果图走起代码部分总结

我对于单点的理解

正常的登录

进入自己系统的登录页面，输入用户名密码，登录系统。

单点登录

来到一个第三方的登录页面，输入用户名密码，在这个页面登录成功之后，就算成功的登录了应用系统。好处在于这个登录页面不仅仅是登录一个系统，可以同时登录多个系统。即所谓的一次登录，全程畅通。

效果图走起

另外开一个浏览器

原来的页面刷新一下

发现他已经被挤下线

代码部分

package com.nx.j2ee.service;

import org.springframework.stereotype.Service;

import javax.servlet.http.HttpSession;

import java.util.HashMap;

import java.util.Map;

@Service

public class OnlineService {

private Map UserMap = new HashMap<>();

public HttpSession getUserMap(String name) {

return UserMap.get(name);

}

public void setUserMap(String name, HttpSession httpSession) {

UserMap.put(name, httpSession);

}

public void delectUserMap(String name){

UserMap.remove(name);

}

public int shownum(){

return UserMap.size();

}

public Map showall(){

return UserMap;

}

}

登入controller

package com.nx.j2ee.controller;

import com.nx.j2ee.entity.UserEntity;

import com.nx.j2ee.service.OnlineService;

import com.nx.j2ee.service.UserService;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Controller;

import org.springframework.ui.Model;

import org.springframework.web.bind.annotation.GetMapping;

import org.springframework.web.bind.annotation.PostMapping;

import org.springframework.web.bind.annotation.RequestParam;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpSession;

@Controller

public class User {

@Autowired

private UserService userService;

@Autowired

private OnlineService onlineService;

/**

* @Description : 登入显示

* @Author : 南巷的花猫

* @Date : 2021/11/23 14:02

*/

@GetMapping("/loVaqqIvTeVCgin")

public String showlogin(){

return "user/Login";

}

/**

* @Description : 获取登入信息

* @Author : 南巷的花猫

* @Date : 2021/11/23 14:03

*/

@PostMapping("/login")

public String setlogin(@RequestParam("name") String name,

@RequestParam("password") String password, Model model,

HttpSession httpSession){

UserEntity userEntity = userService.login(name, password);

if (userEntity != null){

if(onlineService.getUserMap(name) != null){

onlineService.getUserMap(name).invalidate();

}

httpSession.setAttribute("userinfo", userEntity);

onlineService.setUserMap(name, httpSession);

return "redirect:/";

}else {

model.addAttribute("eroor", "用户名或者密码出错");

return "user/Login";

}

}

@GetMapping("/downline")

public String downline(HttpSession httpSession){

UserEntity userEntity = (UserEntity) httpSession.getAttribute("userinfo");

onlineService.delectUserMap(userEntity.getName());

httpSession.invalidate();

return "redirect:/";

}

}

首页controller

package com.nx.j2ee.controller;

import com.nx.j2ee.entity.UserEntity;

import com.nx.j2ee.service.OnlineService;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Controller;

import org.springframework.ui.Model;

import org.springframework.web.bind.annotation.GetMapping;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpSession;

import java.util.Map;

import java.util.Set;

@Controller

public class Index {

@Autowired

private OnlineService onlineService;

private boolean select = false;

@GetMapping("/")

public String showindex(Model model, HttpSession httpSession){

UserEntity userinfo = (UserEntity) httpSession.getAttribute("userinfo");

if (userinfo != null){

this.select = true;

}else {

this.select = false;

}

int onlinenum = onlineService.shownum();

Set userset = onlineService.showall().keySet();

model.addAttribute("onlinenum", onlinenum);

model.addAttribute("userinfo", userinfo);

model.addAttribute("userset", userset);

model.addAttribute("select", this.select);

return "home/index";

}

}

HTML页面

xmlns:th="http://thymeleaf.org">

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总结

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