springcloud微服务基于redis集群的单点登录

yls
2019-9-23

简介

本文介绍微服务架构中如何实现单点登录功能
创建三个服务：

操作redis集群的服务，用于多个服务之间共享数据
统一认证中心服务，用于整个系统的统一登录认证
服务消费者，用于测试单点登录

大体思路：每个服务都设置一个拦截器检查cookie中是否有token,若有token,则放行，若没有token,重定向到统一认证中心服务进行登录，登录成功后返回到被拦截的服务。

搭建redis集群服务

搭建redis集群参考文档

搭建统一认证中心

主函数添加注解

/**
- 单点登录既要注册到服务注册中心，又要向redis服务系统获取鼓舞
- 所以要添加 @EnableDiscoveryClient @EnableEurekaClient 两个注解
*/

@EnableDiscoveryClient @EnableEurekaClient @EnableFeignClients @MapperScan(basePackages = "com.example.itokenservicesso.mapper") @SpringBootApplication public class ItokenServiceSsoApplication {
```
public static void main(String[] args) {
    SpringApplication.run(ItokenServiceSsoApplication.class, args);
}
```
}

消费redis服务和熔断器

@FeignClient(value = "itoken-service-redis", fallback = RedisServiceFallBack.class) public interface RedisService {

@PostMapping(value = "put")
public String put(@RequestParam(value = "key") String key, @RequestParam(value = "value") String value, @RequestParam(value = "seconds") long seconds);

@GetMapping(value = "get")
public String get(@RequestParam(value = "key") String key);

}

@Component public class RedisServiceFallBack implements RedisService { @Override public String put(String key, String value, long seconds) { return FallBack.badGateWay(); } @Override public String get(String key) { return FallBack.badGateWay(); } }

public class FallBack {

public static String badGateWay(){
    try {
        return JsonUtil.objectToString(ResultUtil.error(502,"内部错误"));
    } catch (JsonProcessingException e) {
        e.printStackTrace();
    }
    return null;
}

}

登录服务

@Service public class LoginServiceImpl implements LoginService {

@Autowired
private UserMapper userMapper;

@Autowired
private RedisService redisService;

@Override
public User login(String loginCode, String plantPassword) {
    //从缓存中获取登录用户的数据
    String json = redisService.get(loginCode);

    User user = null;
    //如果缓存中没有数据,从数据库取数据
    if (json == null) {
        user = userMapper.selectAll(loginCode);
        String passwordMd5 = DigestUtils.md5DigestAsHex(plantPassword.getBytes());
        if (user != null && passwordMd5.equals(user.getPassword())) {
            //登录成功，刷新缓存
            try {
                redisService.put(loginCode, JsonUtil.objectToString(user), 60 * 60 * 24);
            } catch (JsonProcessingException e) {
                e.printStackTrace();
            }
            return user;
        } else {
            return null;
        }
    }
    //如果缓存中有数据
    else {
        try {
            user = JsonUtil.stringToObject(json, User.class);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    return user;
}

}

contoller层，处理登录业务和登录跳转

登录业务

    /**
    * 登录业务
    *
    * @param loginCode
    * @param password
    * @return
    */
    @PostMapping("login")
    public String login(String loginCode,
                        String password,
                        @RequestParam(required = false) String url,
                        HttpServletRequest request,
                        HttpServletResponse response,
                        RedirectAttributes redirectAttributes) {
        User user = loginService.login(loginCode, password);
        //登录成功
        if (user != null) {

            String token = UUID.randomUUID().toString();
            //将token放入缓存
            String result = redisService.put(token, loginCode, 60 * 60 * 24);
            //如果redisService没有熔断，也就是返回ok,才能执行
            if (result != null && result.equals("ok")) {
                CookieUtil.setCookie(response, "token", token, 60 * 60 * 24);
                if (url != null && !url.trim().equals(""))
                    return "redirect:" + url;
            }
            //熔断后返回错误提示
            else {
                redirectAttributes.addFlashAttribute("message", "服务器异常");
            }

        }
        //登录失败
        else {
            redirectAttributes.addFlashAttribute("message", "用户名或密码错误");
        }
        return "redirect:/login";
    }

登录跳转

@Autowired
private LoginService loginService;

@Autowired
private RedisService redisService;

/**
* 跳转登录页
*/
@GetMapping("login")
public String login(HttpServletRequest request,
                    Model model,
                    @RequestParam(required = false) String url
) {
    String token = CookieUtil.getCookie(request, "token");
    //token不为空可能已登录,从redis获取账号
    if (token != null && token.trim().length() != 0) {
        String loginCode = redisService.get(token);
        //如果账号不为空，从redis获取该账号的个人信息
        if (loginCode != null && loginCode.trim().length() != 0) {
            String json = redisService.get(loginCode);
            if (json != null && json.trim().length() != 0) {
                try {
                    User user = JsonUtil.stringToObject(json, User.class);

                    //已登录
                    if (user != null) {
                        if (url != null && url.trim().length() != 0) {
                            return "redirect:" + url;
                        }
                    }
                    //将登录信息传到登录页
                    model.addAttribute("user", user);

                } catch (IOException e) {
                    e.printStackTrace();
                }

            }
        }
    }
    return "login";
}

搭建服务消费者：添加一个拦截器，判断token是否为空

拦截器

public class WebAdminInterceptor implements HandlerInterceptor {

@Autowired
private RedisService redisService;

@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
    String token = CookieUtil.getCookie(request, "token");

    //token为空，一定没有登录
    if (token == null || token.isEmpty()) {
        response.sendRedirect("http://localhost:8503/login?url=http://localhost:8601/login");
        return false;
    }
    return true;
}

@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

    HttpSession session = request.getSession();
    User user = (User) session.getAttribute("user");

    //已登陆状态
    if (user != null) {
        if (modelAndView != null) {
            modelAndView.addObject("user", user);

        }
    }
    //未登录状态
    else {
        String token = CookieUtil.getCookie(request, "token");
        if (token != null && !token.isEmpty()) {
            String loginCode = redisService.get(token);

            if (loginCode != null && !loginCode.isEmpty()) {
                String json = redisService.get(loginCode);
                if (json != null && !json.isEmpty()) {
                    //已登录状态，创建局部会话
                    user = JsonUtil.stringToObject(json, User.class);
                    if (modelAndView != null) {
                        modelAndView.addObject("user", user);
                    }
                    request.getSession().setAttribute("user", user);
                }
            }
        }
    }

    //二次确认是否有用户信息
    if (user == null) {
        response.sendRedirect("http://localhost:8503/login?url=http://localhost:8601/login");

    }

}

@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

}

}

配置拦截器

@Configuration public class WebAdminInterceptorConfig implements WebMvcConfigurer {

//将拦截器设置为Bean,在拦截其中才能使用@AutoWired注解自动注入
@Bean
WebAdminInterceptor webAdminInterceptor() {
    return new WebAdminInterceptor();
}

@Override
public void addInterceptors(InterceptorRegistry registry) {
    registry.addInterceptor(webAdminInterceptor())
            .addPathPatterns("/**")
            .excludePathPatterns("/static");
}

}