SpringCloud章节复习已经过去，新的章节Redis开始了，这个章节中将会回顾Redis实战项目 大众点评
主要依照以下几个原则

1. 基础+实战的Demo和Coding上传到我的代码仓库
2. 在原有基础上加入一些设计模式，stream+lamdba等新的糖
3. 通过DeBug调试，进入组件源码去分析底层运行的规则和设计模式

代码会同步在我的gitee中去，觉得不错的同学记得一键三连求关注，感谢：
Session-链接: RedisProjectDemo
Redis优化-链接: RedisProject

需求：基于Redis实现短信验证登录

当出现了Tomcat集群如何处理session？

基于Redis的短信登录实战

优化为Redis login方法

1. 通过Redis来存放验证码
2. 使用UUID实现token作为key，获取对应的User信息
3. 注意BeanUtil.beanToMap的API使用

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        String phone = loginForm.getPhone();
        if ((RegexUtils.isPhoneInvalid(phone))) {
            return Result.fail("手机格式错误！");
        }


//通过Redis来存放验证码
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        String code = loginForm.getCode();

//        Object cacheCode = session.getAttribute("code");

        if (cacheCode == null || !cacheCode.toString().equals(code)) {
            return Result.fail("验证码错误！");
        }

        User user = query().eq("phone", phone).one();

        if(user==null){
            user = createUserWithPhone(phone);
        }

//        session.setAttribute("user", BeanUtil.copyProperties(user, UserDTO.class));

        String token = UUID.randomUUID().toString(true);
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);

        Map<String, Object> stringObjectMap = BeanUtil.beanToMap(userDTO, new HashMap<>(),
                        CopyOptions.create().setIgnoreNullValue(true)
                        .setFieldValueEditor((fieldName, fieldValue)->{
                            return fieldValue.toString();
                        }));
//        String tokenKey = LOGIN_USER_KEY + token;
        String tokenKey = LOGIN_USER_KEY + "1" ;
//使用UUID实现token作为key，获取对应的User信息
        stringRedisTemplate.opsForHash().putAll(tokenKey, stringObjectMap);
        stringRedisTemplate.expire(token, LOGIN_USER_TTL, TimeUnit.SECONDS);

        return Result.ok();
    }

    private User createUserWithPhone(String phone) {
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(8));
        save(user);
        return user;
    }

配置拦截器实现双重验证

1. 设定两层优化器，第一层作为登录验证，获取ThreadLocal中的信息，不断更新Redis
2. 第二层为了拦截部分资源信息

public class LoginInterceptor implements HandlerInterceptor {

/*    private StringRedisTemplate stringRedisTemplate;

    public LoginInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }*/

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {


        if (UserHolder.getUser() == null) {
            response.setStatus(401);
            return false;
        }

        return true;
    }
}

public class RefreshInterceptor implements HandlerInterceptor {

    private StringRedisTemplate stringRedisTemplate;

    public RefreshInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {


//        String token = request.getHeader("authorization");
        String token = "1";
        if (StrUtil.isBlank(token)) {
            return true;
        }
/*        UserDTO userDTO = (UserDTO) request.getSession().getAttribute("user");
        if (userDTO==null) {
            response.setStatus(401);
            return false;
        }*/
        String key = LOGIN_USER_KEY + token;
        Map<Object, Object> userMap = stringRedisTemplate.opsForHash().entries(key);
        if (userMap == null) {
            return true;
        }
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);

        UserHolder.saveUser(userDTO);
        stringRedisTemplate.expire(key, LOGIN_USER_TTL, TimeUnit.SECONDS);

        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        UserHolder.removeUser();
        System.out.println("123");
    }
}

配置类实现异步/排序 拦截

通过两种方式实现顺序 拦截器

@Configuration
public class MvcConfig implements WebMvcConfigurer {

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        // TODO 通过异步请求实现
/*        CompletableFuture<Object> objectCompletableFuture = CompletableFuture.supplyAsync(() -> {
            InterceptorRegistration interceptorRegistration = registry.addInterceptor(
                    new RefreshInterceptor(stringRedisTemplate))
                    .addPathPatterns("/**");
            System.out.println("第一步拦截");
            return interceptorRegistration;
        });

        objectCompletableFuture.thenAccept((result)->{
            registry.addInterceptor(new LoginInterceptor())
                    .excludePathPatterns(
                            "/shop/**",
                            "voucher/**",
                            "shop-type/**",
                            "upload/**",
                            "/blog/hot",
                            "/user/code",
                            "/user/login"
                    );
            System.out.println("第二步");
        });*/

        registry.addInterceptor(
                new RefreshInterceptor(stringRedisTemplate))
                .addPathPatterns("/**").order(0);


        registry.addInterceptor(new LoginInterceptor())
                .excludePathPatterns(
                        "/shop/**",
                        "voucher/**",
                        "shop-type/**",
                        "upload/**",
                        "/blog/hot",
                        "/user/code",
                        "/user/login"
                ).order(1);


    }
}

结果展示