分布式多系统单点登录

使用许雪里大佬编写的框架实现，git地址：https://gitee.com/xuxueli0323/xxl-sso

启动三个项目

/xxl-sso-server 登录服务器 8080 ssoserver.com

/xxl-sso-web-sample-apringboot 项目1 8081 client1.com

/xxl-sso-web-sample-apringboot 项目1 8082 client2.com

host文件：

127.0.0.1 ssoserver.com

127.0.0.1 client1.com

127.0.0.1 client2.com

核心：三个系统即使域名不一样，想办法给三个系统同步同一个用户的票据；

1）中央认证服务器；ssoserver.com

2）其它系统，想要登录取ssoserver.com登录，登录成功跳转回来

3）只要有一个登录，其它都不用登录

4）全系统统一一个sso-sessionid，所有系统可能域名都不相同

登录验证中心sso-server代码：

@Controller
public class LoginController {

    @Autowired
    StringRedisTemplate redisTemplate;

    @ResponseBody
    @GetMapping("/userinfo")
    public String userinfo(@RequestParam(value = "token") String token) {
        String s = redisTemplate.opsForValue().get(token);

        return s;

    }


    @GetMapping("/login.html")
    public String loginPage(@RequestParam("redirect_url") String url, Model model, @CookieValue(value = "sso_token", required = false) String sso_token) {
        if (!StringUtils.isEmpty(sso_token)) {
            return "redirect:" + url + "?token=" + sso_token;
        }


        model.addAttribute("url", url);

        return "login";
    }

    @PostMapping(value = "/doLogin")
    public String doLogin(@RequestParam("username") String username, @RequestParam("password") String password, @RequestParam("redirect_url") String url, HttpServletResponse response) {

        //登录成功跳转，跳回到登录页
        if (!StringUtils.isEmpty(username) && !StringUtils.isEmpty(password)) {

            String uuid = UUID.randomUUID().toString().replace("_", "");
            redisTemplate.opsForValue().set(uuid, username);
            Cookie sso_token = new Cookie("sso_token", uuid);

            response.addCookie(sso_token);
            return "redirect:" + url + "?token=" + uuid;
        }
        return "login";
    }

客户端（需要登录的系统）

@Controller
public class HelloController {


    /**
     * 无需登录就可访问
     *
     * @return
     */
    @ResponseBody
    @GetMapping(value = "/hello")
    public String hello() {
        return "hello";
    }


    @GetMapping(value = "/employees")
    public String employees(Model model, HttpSession session, @RequestParam(value = "token", required = false) String token) {

        if (!StringUtils.isEmpty(token)) {
            RestTemplate restTemplate=new RestTemplate();
            ResponseEntity<String> forEntity = restTemplate.getForEntity("http://sso.mroldx.cn:8080/userinfo?token=" + token, String.class);
            String body = forEntity.getBody();

            session.setAttribute("loginUser", body);
        }
        Object loginUser = session.getAttribute("loginUser");

        if (loginUser == null) {

            return "redirect:" + "http://sso.mroldx.cn:8080/login.html"+"?redirect_url=http://localhost:8081/employees";
        } else {


            List<String> emps = new ArrayList<>();

            emps.add("张三");
            emps.add("李四");

            model.addAttribute("emps", emps);
            return "employees";
        }
    }

}