SpringBoot如何实现同域SSO(单点登录)

<!--spring-data-jpa-->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<!-- Mysql -->
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
</dependency>

server:
  port: 8090

spring:
  application:
    name: authority
  datasource:
    url: jdbc:mysql://127.0.0.1:3306/SSO?useUnicode=true&characterEncoding=utf8&useSSL=false&allowPublicKeyRetrieval=true&serverTimezone=GMT%2B8
    username: root
    passWord: 123456
    driver-class-name: com.mysql.cj.jdbc.Driver

@Controller
public class IndexController {

    @Autowired
    UserRepository userRepository;

    
    public String url;

    
    @GetMapping("/index")
    public String index() {
        return "index";
    }

    
    @GetMapping("/")
    public String index1() {
        return "index";
    }

    
    @PostMapping("login")
    public String login(String username, String password, httpservletResponse response) {
        // 用户登录
        boolean exists = userRepository.exists(Example.of(new User()
                .setUsername(username)
                .setPassword(password)));
        if (exists) {
            Cookie cookie = new Cookie("username", username);
            response.addCookie(cookie);
            // 如果正常访问即跳转到正常页面
            if (StringUtils.isEmpty(url)) {
                return "demo1";
            }
            // 如果之前存在访问的页面，认证完成即跳转会原有的页面
            return url;
        }
        return "index";
    }

    
    @GetMapping("demo2")
    public String demo2() {
        return "demo2";
    }

    
    @GetMappi=ng("demo1")
    public String demo1() {
        return "demo1";
    }

}

@Component
public class CookieHandlerInterceptor implements HandlerInterceptor {

    @Autowired
    UserRepository userRepository;

    @Autowired
    IndexController indexController;

    
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 获取当前请求得路径 如果不是正常得登录界面请求 登录成功之后需要跳转到原来请求得界面上
        String servletPath = request.getServletPath();
        // 对不需要拦截得路径进行放行
        if ("/index".equals(servletPath) || "/".equals(servletPath) || "/login".equals(servletPath)) {
            return true;
        }
        if (!"/index".equals(servletPath) || !"/".equals(servletPath)) {
            indexController.url = servletPath;
        }
        Cookie[] cookies = request.getCookies();
        boolean exists = false;
        if (cookies != null) {
            for (Cookie cookie : cookies) {
                String value = cookie.getValue();
                if (!StringUtils.isEmpty(value)) {
                    exists = userRepository.exists(Example.of(new User()
                            .setUsername(value)));
                }
            }
        }
        if (exists) {
            return true;
        } else {
            response.sendRedirect("/index");
        }
        return false;
    }
}

@Configuration
public class WEBmvcConfig extends WebMvcConfigurationSupport {

    
    @Autowired
    private CookieHandlerInterceptor cookieHandlerInterceptor;

    
    @Override
    protected void addInterceptors(InterceptorReGIStry registry) {
        registry.addInterceptor(this.cookieHandlerInterceptor).addPathPatterns("/**");
        super.addInterceptors(registry);
    }

}

@Component
public class CookieFilter extends OncePerRequestFilter {

    @Autowired
    UserRepository userRepository;

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {

        // 获取当前请求得路径 如果不是正常得登录界面请求 登录成功之后需要跳转到原来请求得界面上
        String servletPath = request.getServletPath();
        IndexController indexController = new IndexController();
        // 对不需要拦截得路径进行放行
        if ("/index".equals(servletPath) || "/".equals(servletPath) || "/login".equals(servletPath)) {
            filterChain.doFilter(request, response);
        }
        if (!"/index".equals(servletPath) || !"/".equals(servletPath)) {
            indexController.url = servletPath;
        }
        Cookie[] cookies = request.getCookies();
        boolean exists = false;
        if (cookies != null) {
            for (Cookie cookie : cookies) {
                String value = cookie.getValue();
                if (!StringUtils.isEmpty(value)) {
                    exists = userRepository.exists(Example.of(new User()
                            .setUsername(value)));
                }
            }
        }
        if (exists) {
            filterChain.doFilter(request, response);

        } else {
            response.sendRedirect("/");
        }
    }
}

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>登录</title>
</head>
<body>
<div align="center">
    <h1>请登录</h1>
    <fORM action="/login" method="post">
        <span>账号：</span><input name="username" type="text" value="zhang"><br>
        <span>密码：</span><input name="password" type="password" value="123456"><br>
        <button type="submit" style="margin: 10px 0">登录</button>
    </form>
</div>
</body>
</html>