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<String, HttpSession> 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<String, HttpSession> 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;
@GetMapping("/login")
public String showlogin(){
return "user/Login";
}
@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<String> 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
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<link rel="stylesheet" href="/layui/css/layui.css">
<title>首页</title>
</head>
<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="${onlinenum}"></span></a>
</li>
<li class="layui-nav-item">
<a th:href="@{/PTcourse}">普通课程</a>
</li>
<li class="layui-nav-item">
<a th:href="@{/VIPcourse}">vip课程</a>
</li>
<li class="layui-nav-item">
<a th:href="@{/GZcourse}">贵族课程</a>
</li>
<li class="layui-nav-item" style="float: right">
<a href="" th:if="${not select}">游客</a>
<a href="" th:if="${userinfo}" th:text="${userinfo.name}"></a>
<dl class="layui-nav-child">
<dd th:if="${select}"><span style="color: #2d6086">等级: </span><span style="color: #0C0C0C" th:text="${userinfo.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="${select}">下线</a></dd>
<dd><a th:href="@{/login}" th:if="${not select}">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="username:${userset}">
<p th:text="${username}"></p>
</div>
</div>
</div>
<script src="/layui/layui.js"></script>
<script>
layui.use(['layer', 'form'], function(){
var layer = layui.layer
,form = layui.form;
layer.msg('追求极简');
});
</script>
</body>
</html>
总结
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