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springboot如何通过session实现单点登入详解

更新时间:2023-04-04 00:22:14 阅读：评论：0

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.rvice;import org.springframework.stereotype.rvice;import javax.rvlet.http.httpssion;import java.util.hashmap;import java.util.map;@rvicepublic class onlinervice {    private map<string, httpssion> urmap = new hashmap<>();    public httpssion geturmap(string name) {        return urmap.get(name);    }    public void turmap(string name, httpssion httpssion) {        urmap.put(name, httpssion);    }    public void delecturmap(string name){        urmap.re幻游记move(name);    }    public int shownum(){        return urmap.size();    }    public map<string, httpssion> showall(){        return urmap;    }}

登入controller

package com.nx.j2ee.controller;import com.nx.j2ee.entity.urentity;import com.nx.j2ee.rvice.onlinervice;import com.nx.j2ee.rvice.urrvice;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.rvlet.http.httprvletrequest;import javax.rvlet.http.httpssion;@controllerpublic class ur {    @autowired    private urrvice urrvice;    @autowired    private onlinervice onlinervice;    /**     * @description : 登入显示     * @author : 南巷的花猫     * @date : 2021/11/23 14:02    */    @getmapping("/login")    public string showlogin(){        return "ur/login";    }    /**     * @description : 获取登入信息     * @author : 南巷的花猫     * @date : 2021/11/23 14:03    */    @postmapping("/login")    public string tlogin(@requestparam("name") string name,                           @requestparam("password") string password, model model,                           httpssion httpssion){        urentity urentity = urrvice.login(name, password);        if (urentity != null){            if(onlinervice.geturmap(name) != null){                onlinervice.geturmap(name).invalidate();            }            httpssion.tattribute("urinfo", urentity);            onlinervice.turmap(name, httpssion);            return "redirect:/";        }el {            model.addattribute("eroor", "用户名或者密码出错");            return "ur/login";        }    }    @getmapping("/downline")    public string downline(httpssion httpssion){        urentity urentity = (urentity) httpss大叶绿萝ion.getattribute("urinfo");        onlinervice.delecturmap(urentity.getname());        httpssion.invalidate();        return "redirect:/";   中专是什么意思 }}

首页controller

package com.nx.j2ee.controller;import com.nx.j2ee.entity.urentity;import com.nx.j2ee.rvice.onlinervice;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.rvlet.http.httprvletrequest;import javax.rvlet.http.httpssion;import java.util.map;import java.util.t;@controllerpublic class中考 成绩查询 index {    @autowired    private onlinervice onlinervice;    private boolean lect = fal;    @getmapping("/")    public string showindex(model model, httpssion httpssion){        urentity urinfo = (urentity) httpssion.getattribute("urinfo");        if (urinfo != null){            this.lect = true;        }el {            this.lect = fal;        }        int onlinenum = onlinervice.shownum();        t<string> urt = onlinervice.showall().keyt();        model.addattribute("onlinenum", onlinenum);        model.addattribute("urinfo", urinfo);        model.addattribute("urt", urt);        model.addattribute("lect", this.lect);        return "home/index";    }}

html页面

<!doctype html><html xmlns="/d/file/titlepic/"      xmlns:th="http://www.thymeleaf.org"><head>    <meta chart="utf-8">    <link rel="stylesheet" href="/layui/css/layui.css">    <title>首页</title></head>&l梦的怒放歌词t;body><div class="layui-container">    <div>        <ul class="layui-nav layui-bg-green" lay-filter="">            <li class="layui-nav-item">                <a href="">在线人数<span class="layui-badge" th:text="${onlinenum}"></span></a>            </li>            <li class="layui-nav-item">                <a th:href="@{/ptcour}">普通课程</a>            </li>            <li class="layui-nav-item">                <a th:href="@{/vipcour}">vip课程</a>            </li>            <li class="layui-nav-item">                <a th:href="@{/gzcour}">贵族课程</a>            </li>            <li class="layui-nav-item" style="float: right">                <a href="" th:if="${not lect}">游客</a>                <a href="" th:if="${urinfo}" th:text="${urinfo.name}"></a>                <dl class="layui-nav-child">                    <dd th:if="${lect}"><span style="color: #2d6086">等级:&nbsp;</span><span style="color: #0c0c0c" th:text="${urinfo.gettest1()}"></span></dd>                    <dd><a href="javascript:;">修改信息</a></dd>                    <dd><a href="javascript:;">安全管理</a></dd>                    <dd><a th:href="@{/downline}" th:if="${lect}">下线</a></dd>                    <dd><a th:href="@{/login}" th:if="${not lect}">登入</a></dd>                </dl>            </li>        </ul>    </div>    <div style="margin-top: 20px;padding: 0px 50px 0px 50px">        <div>            <h3 style="color: #ac0d22">在线用户列表</h3>        </div>        <div th:each="urname:${urt}">            <p th:text="${urname}"></p>        </div>    </div></div><script src="/layui/layui.js"></script><script>  layui.u(['layer', 'form'], function(){    var layer = layui.layer            ,form = layui.form;    layer.msg('追求极简');  });</script></body></html>