学习目标：

来源：黑马教程
使用Redis中BitMap数据结构使用签到功能和连续签到功能

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学习产出：

解决方案：

1. 准备pom环境

		<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-redis</artifactId></dependency><dependency><groupId>org.apache.commons</groupId><artifactId>commons-pool2</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><scope>runtime</scope><version>5.1.47</version></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><optional>true</optional></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-boot-starter</artifactId><version>3.4.3</version></dependency><!--hutool--><dependency><groupId>cn.hutool</groupId><artifactId>hutool-all</artifactId><version>5.7.17</version></dependency><dependency><groupId>org.redisson</groupId><artifactId>redisson</artifactId><version>3.23.1</version></dependency>

2. 配置ThreadLocal和过滤器

public class UserHolder {private static final ThreadLocal<UserDTO> tl = new ThreadLocal<>();public static void saveUser(UserDTO user){tl.set(user);}public static UserDTO getUser(){return tl.get();}public static void removeUser(){tl.remove();}
}

@Configuration
public class MvcConfig implements WebMvcConfigurer {@Autowiredprivate StringRedisTemplate redis;@Overridepublic void addInterceptors(InterceptorRegistry registry) {registry.addInterceptor(new LoginInterceptor()).excludePathPatterns("/user/code","/user/login","/blog/hot","/shop/**","/shop-type/**","/voucher/**").order(2);registry.addInterceptor(new RefreshTokenInterceptor(redis)).addPathPatterns("/**").order(1);}
}
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@Slf4j
public class LoginInterceptor implements HandlerInterceptor {//controller执行之前@Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {//1.判断是否需要拦截ThreadLocalif (UserHolder.getUser()==null) {response.setStatus(401);return false;}//7.放行return true;}//渲染后返回给前台数据前@Overridepublic void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {//移除用户，避免内存泄露UserHolder.removeUser();}
}
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@Slf4j
public class RefreshTokenInterceptor implements HandlerInterceptor {//这个对象不是由spring管理的所以不能用注解自动注入private StringRedisTemplate redis;public RefreshTokenInterceptor(StringRedisTemplate redis) {this.redis = redis;}//controller执行之前@Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {//1.获取请求头中的tokenString token = request.getHeader("authorization");if (StrUtil.isBlank(token)) {return true;}//2.基于token获取redis中的用户//通过key取到hash中的map集合数据Map<Object, Object> userMap = redis.opsForHash().entries("login:token:" + token);//3.判断用户是否存在if (userMap.isEmpty()) {return true;}//5.将查询到的hash数据转为userDto对象UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);//6.存在，保存用户信息到ThreadLocal中UserHolder.saveUser(userDTO);//7.刷新token有效期redis.expire(LOGIN_USER_KEY + token, 30, TimeUnit.MINUTES);log.info("我是第一个拦截器当前拦截所有请求的用户为，线程为{},{}",UserHolder.getUser(),Thread.currentThread());//8.放行return true;}

3. Controller层：负责接收请求和向下分配

@RestController
@RequestMapping("/user")
public class UserController{@Resourceprivate IUserService userService;@PostMapping("/sign")public Result sign(){return userService.sign();}
}

4. Service层：负责业务的处理逻辑签到功能

@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {private static final ObjectMapper mapper = new ObjectMapper();@Resourceprivate StringRedisTemplate redis;@Overridepublic Result sign() {//1. 获取当前登录用户IdLong userId = UserHolder.getUser().getId();//2.获取日期：Redis中的offset偏移量是从0开始算，偏移量n代表的这个月的第n+1天int offset = LocalDateTime.now().getDayOfMonth() - 1;//3.拼接key存入RedisLocalDateTime now = LocalDateTime.now();String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));String key = "sign:" + userId + keySuffix;//true代表的是存入BitMap中的二进制是1redis.opsForValue().setBit(key, offset, true);return Result.ok();}
}`5. Service层实现连续签到功能`
```java
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {private static final ObjectMapper mapper = new ObjectMapper();@Resourceprivate StringRedisTemplate redis;@Overridepublic Result signCount() {//1.获取当前登录用户Long userId = UserHolder.getUser().getId();//2.获取日期LocalDateTime nowTime = LocalDateTime.now();//3.拼接keyString keySuffix = nowTime.format(DateTimeFormatter.ofPattern(":yyyyMM"));String key = "sign:" + userId + keySuffix;//4.获取今天是第几天int day = nowTime.getDayOfMonth();//5.获取本月截至今天为止所有的签到记录，返回的是一个十进制数字List<Long> result = redis.opsForValue().bitField(key,BitFieldSubCommands.create().get(BitFieldSubCommands.BitFieldType.unsigned(day)).valueAt(0));if (result.isEmpty() || result == null) {return Result.ok(0);}Long signCount = result.get(0);if (signCount == null || signCount == 0) {return Result.ok(0);}//6.遍历int count=0;while (true) {if ((signCount & 1) == 0) {//不为0，跳出循环break;} else {count++;signCount = signCount >> 1;}}//7.签到记录返回的十进制数字与1做 与运算return Result.ok(count);}
}