Redis高效實現(xiàn)點贊、取消點贊功能！
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編輯：業(yè)余草
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基于 SpringCloud, 用戶發(fā)起點贊、取消點贊后先存入 Redis 中，再每隔兩小時從 Redis 讀取點贊數(shù)據(jù)寫入數(shù)據(jù)庫中做持久化存儲。
點贊功能在很多系統(tǒng)中都有，但別看功能小，想要做好需要考慮的東西還挺多的。
「點贊、取消點贊是高頻次的操作，若每次都讀寫數(shù)據(jù)庫，大量的操作會影響數(shù)據(jù)庫性能，所以需要做緩存。」
至于多久從 Redis 取一次數(shù)據(jù)存到數(shù)據(jù)庫中，根據(jù)項目的實際情況定吧，我是暫時設(shè)了兩個小時。
項目需求需要查看都誰點贊了，所以要存儲每個點贊的點贊人、被點贊人，不能簡單的做計數(shù)。
文章分四部分介紹：
Redis 緩存設(shè)計及實現(xiàn)
數(shù)據(jù)庫設(shè)計
數(shù)據(jù)庫操作
開啟定時任務(wù)持久化存儲到數(shù)據(jù)庫
一、Redis 緩存設(shè)計及實現(xiàn)
1.1 Redis 安裝及運行
?Redis 安裝請自行查閱相關(guān)教程。
?
說下Docker 安裝運行 Redis
docker?run?-d?-p?6379:6379?redis:4.0.8??
如果已經(jīng)安裝了 Redis，打開命令行，輸入啟動 Redis 的命令
redis-server??
1.2 Redis 與 SpringBoot 項目的整合
1.在 pom.xml 中引入依賴
<dependency>??
????<groupId>org.springframework.bootgroupId>??
????<artifactId>spring-boot-starter-data-redisartifactId>??
dependency>??
2.在啟動類上添加注釋 @EnableCaching
@SpringBootApplication??
@EnableDiscoveryClient??
@EnableSwagger2??
@EnableFeignClients(basePackages?=?"com.solo.coderiver.project.client")??
@EnableCaching??
public?class?UserApplication?{
????public?static?void?main(String[]?args)?{??
????????SpringApplication.run(UserApplication.class,?args);??
????}??
}??
3.編寫 Redis 配置類 RedisConfig
import?com.fasterxml.jackson.annotation.JsonAutoDetect;??
import?com.fasterxml.jackson.annotation.PropertyAccessor;??
import?com.fasterxml.jackson.databind.ObjectMapper;??
import?org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;??
import?org.springframework.context.annotation.Bean;??
import?org.springframework.context.annotation.Configuration;??
import?org.springframework.data.redis.connection.RedisConnectionFactory;??
import?org.springframework.data.redis.core.RedisTemplate;??
import?org.springframework.data.redis.core.StringRedisTemplate;??
import?org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;??
??
import?java.net.UnknownHostException;??
@Configuration??
public?class?RedisConfig?{??
??
????@Bean??
????@ConditionalOnMissingBean(name?=?"redisTemplate")??
????public?RedisTemplate?redisTemplate(??
????????????RedisConnectionFactory?redisConnectionFactory)??
????????????throws?UnknownHostException? {??
??
????????Jackson2JsonRedisSerializer至此 Redis 在 SpringBoot 項目中的配置已經(jīng)完成，可以愉快的使用了。
1.3 Redis 的數(shù)據(jù)結(jié)構(gòu)類型
Redis 可以存儲鍵與5種不同數(shù)據(jù)結(jié)構(gòu)類型之間的映射，這5種數(shù)據(jù)結(jié)構(gòu)類型分別為String（字符串）、List（列表）、Set（集合）、Hash（散列）和 Zset（有序集合）。
下面來對這5種數(shù)據(jù)結(jié)構(gòu)類型作簡單的介紹：
1.4 點贊數(shù)據(jù)在 Redis 中的存儲格式
用 Redis 存儲兩種數(shù)據(jù)，一種是記錄點贊人、被點贊人、點贊狀態(tài)的數(shù)據(jù)，另一種是每個用戶被點贊了多少次，做個簡單的計數(shù)。
「由于需要記錄點贊人和被點贊人，還有點贊狀態(tài)（點贊、取消點贊），還要固定時間間隔取出 Redis 中所有點贊數(shù)據(jù)，分析了下 Redis 數(shù)據(jù)格式中 Hash 最合適。」
因為 Hash 里的數(shù)據(jù)都是存在一個鍵里，可以通過這個鍵很方便的把所有的點贊數(shù)據(jù)都取出。這個鍵里面的數(shù)據(jù)還可以存成鍵值對的形式，方便存入點贊人、被點贊人和點贊狀態(tài)。
設(shè)點贊人的 id 為 likedPostId，被點贊人的 id 為 likedUserId ，點贊時狀態(tài)為 1，取消點贊狀態(tài)為 0。將點贊人 id 和被點贊人 id 作為鍵，兩個 id 中間用 :: 隔開，點贊狀態(tài)作為值。
所以如果用戶點贊，存儲的鍵為：likedUserId::likedPostId，對應(yīng)的值為 1 。取消點贊，存儲的鍵為：likedUserId::likedPostId，對應(yīng)的值為 0 。取數(shù)據(jù)時把鍵用 :: 切開就得到了兩個id，也很方便。
在可視化工具 RDM 中看到的是這樣子
1.5 操作 Redis
將具體操作方法封裝到了 RedisService 接口里
RedisService.java
import?com.solo.coderiver.user.dataobject.UserLike;??
import?com.solo.coderiver.user.dto.LikedCountDTO;??
??
import?java.util.List;??
??
public?interface?RedisService?{??
??
????/**??
?????*?點贊。狀態(tài)為1 ?
?????*?@param?likedUserId??
?????*?@param?likedPostId??
?????*/??
????void?saveLiked2Redis(String?likedUserId,?String?likedPostId);??
??
????/**??
?????*?取消點贊。將狀態(tài)改變?yōu)???
?????*?@param?likedUserId??
?????*?@param?likedPostId??
?????*/??
????void?unlikeFromRedis(String?likedUserId,?String?likedPostId);??
??
????/**??
?????*?從Redis中刪除一條點贊數(shù)據(jù)??
?????*?@param?likedUserId??
?????*?@param?likedPostId??
?????*/??
????void?deleteLikedFromRedis(String?likedUserId,?String?likedPostId);??
??
????/**??
?????*?該用戶的點贊數(shù)加1??
?????*?@param?likedUserId??
?????*/??
????void?incrementLikedCount(String?likedUserId);??
??
????/**??
?????*?該用戶的點贊數(shù)減1??
?????*?@param?likedUserId??
?????*/??
????void?decrementLikedCount(String?likedUserId);??
??
????/**??
?????*?獲取Redis中存儲的所有點贊數(shù)據(jù)??
?????*?@return??
?????*/??
????List?getLikedDataFromRedis() ;??
??
????/**??
?????*?獲取Redis中存儲的所有點贊數(shù)量??
?????*?@return??
?????*/??
????List?getLikedCountFromRedis() ;??
??
}??
實現(xiàn)類 RedisServiceImpl.java
import?com.solo.coderiver.user.dataobject.UserLike;??
import?com.solo.coderiver.user.dto.LikedCountDTO;??
import?com.solo.coderiver.user.enums.LikedStatusEnum;??
import?com.solo.coderiver.user.service.LikedService;??
import?com.solo.coderiver.user.service.RedisService;??
import?com.solo.coderiver.user.utils.RedisKeyUtils;??
import?lombok.extern.slf4j.Slf4j;??
import?org.springframework.beans.factory.annotation.Autowired;??
import?org.springframework.data.redis.core.Cursor;??
import?org.springframework.data.redis.core.RedisTemplate;??
import?org.springframework.data.redis.core.ScanOptions;??
import?org.springframework.stereotype.Service;??
??
import?java.util.ArrayList;??
import?java.util.List;??
import?java.util.Map;??
??
@Service??
@Slf4j??
public?class?RedisServiceImpl?implements?RedisService?{??
??
????@Autowired??
????RedisTemplate?redisTemplate;??
??
????@Autowired??
????LikedService?likedService;??
??
????@Override??
????public?void?saveLiked2Redis(String?likedUserId,?String?likedPostId)?{??
????????String?key?=?RedisKeyUtils.getLikedKey(likedUserId,?likedPostId);??
????????redisTemplate.opsForHash().put(RedisKeyUtils.MAP_KEY_USER_LIKED,?key,?LikedStatusEnum.LIKE.getCode());??
????}??
??
????@Override??
????public?void?unlikeFromRedis(String?likedUserId,?String?likedPostId)?{??
????????String?key?=?RedisKeyUtils.getLikedKey(likedUserId,?likedPostId);??
????????redisTemplate.opsForHash().put(RedisKeyUtils.MAP_KEY_USER_LIKED,?key,?LikedStatusEnum.UNLIKE.getCode());??
????}??
??
????@Override??
????public?void?deleteLikedFromRedis(String?likedUserId,?String?likedPostId)?{??
????????String?key?=?RedisKeyUtils.getLikedKey(likedUserId,?likedPostId);??
????????redisTemplate.opsForHash().delete(RedisKeyUtils.MAP_KEY_USER_LIKED,?key);??
????}??
??
????@Override??
????public?void?incrementLikedCount(String?likedUserId)?{??
????????redisTemplate.opsForHash().increment(RedisKeyUtils.MAP_KEY_USER_LIKED_COUNT,?likedUserId,?1);??
????}??
??
????@Override??
????public?void?decrementLikedCount(String?likedUserId)?{??
????????redisTemplate.opsForHash().increment(RedisKeyUtils.MAP_KEY_USER_LIKED_COUNT,?likedUserId,?-1);??
????}??
??
????@Override??
????public?List?getLikedDataFromRedis()? {??
????????Cursor>?cursor?=?redisTemplate.opsForHash().scan(RedisKeyUtils.MAP_KEY_USER_LIKED,?ScanOptions.NONE);??
????????List?list?=?new?ArrayList<>();??
????????while?(cursor.hasNext()){??
????????????Map.Entry?entry?=?cursor.next();??
????????????String?key?=?(String)?entry.getKey();??
????????????//分離出?likedUserId，likedPostId??
????????????String[]?split?=?key.split("::");??
????????????String?likedUserId?=?split[0];??
????????????String?likedPostId?=?split[1];??
????????????Integer?value?=?(Integer)?entry.getValue();??
??
????????????//組裝成?UserLike?對象??
????????????UserLike?userLike?=?new?UserLike(likedUserId,?likedPostId,?value);??
????????????list.add(userLike);??
??
????????????//存到?list?后從?Redis?中刪除??
????????????redisTemplate.opsForHash().delete(RedisKeyUtils.MAP_KEY_USER_LIKED,?key);??
????????}??
??
????????return?list;??
????}??
??
????@Override??
????public?List?getLikedCountFromRedis()? {??
????????Cursor>?cursor?=?redisTemplate.opsForHash().scan(RedisKeyUtils.MAP_KEY_USER_LIKED_COUNT,?ScanOptions.NONE);??
????????List?list?=?new?ArrayList<>();??
????????while?(cursor.hasNext()){??
????????????Map.Entry?map?=?cursor.next();??
????????????//將點贊數(shù)量存儲在?LikedCountDT??
????????????String?key?=?(String)map.getKey();??
????????????LikedCountDTO?dto?=?new?LikedCountDTO(key,?(Integer)?map.getValue());??
????????????list.add(dto);??
????????????//從Redis中刪除這條記錄??
????????????redisTemplate.opsForHash().delete(RedisKeyUtils.MAP_KEY_USER_LIKED_COUNT,?key);??
????????}??
????????return?list;??
????}??
}??
「用到的工具類和枚舉類」
RedisKeyUtils, 用于根據(jù)一定規(guī)則生成 key
public?class?RedisKeyUtils?{??
??
????//保存用戶點贊數(shù)據(jù)的key??
????public?static?final?String?MAP_KEY_USER_LIKED?=?"MAP_USER_LIKED";??
????//保存用戶被點贊數(shù)量的key??
????public?static?final?String?MAP_KEY_USER_LIKED_COUNT?=?"MAP_USER_LIKED_COUNT";??
??
????/**??
?????*?拼接被點贊的用戶id和點贊的人的id作為key。格式 222222::333333 ?
?????*?@param?likedUserId?被點贊的人id??
?????*?@param?likedPostId?點贊的人的id??
?????*?@return??
?????*/??
????public?static?String?getLikedKey(String?likedUserId,?String?likedPostId){??
????????StringBuilder?builder?=?new?StringBuilder();??
????????builder.append(likedUserId);??
????????builder.append("::");??
????????builder.append(likedPostId);??
????????return?builder.toString();??
????}??
}??
LikedStatusEnum 用戶點贊狀態(tài)的枚舉類
package?com.solo.coderiver.user.enums;??
??
import?lombok.Getter;??
??
/**??
?*?用戶點贊的狀態(tài)??
?*/??
@Getter??
public?enum?LikedStatusEnum?{??
????LIKE(1,?"點贊"),??
????UNLIKE(0,?"取消點贊/未點贊"),??
????;??
??
????private?Integer?code;??
??
????private?String?msg;??
??
????LikedStatusEnum(Integer?code,?String?msg)?{??
????????this.code?=?code;??
????????this.msg?=?msg;??
????}??
}??
二、數(shù)據(jù)庫設(shè)計
數(shù)據(jù)庫表中至少要包含三個字段：被點贊用戶id，點贊用戶id，點贊狀態(tài)。再加上主鍵id，創(chuàng)建時間，修改時間就行了。
建表語句
create?table?`user_like`(??
????`id`?int?not?null?auto_increment,??
????`liked_user_id`?varchar(32)?not?null?comment?'被點贊的用戶id',??
????`liked_post_id`?varchar(32)?not?null?comment?'點贊的用戶id',??
????`status`?tinyint(1)?default?'1'?comment?'點贊狀態(tài)，0取消，1點贊',??
????`create_time`?timestamp?not?null?default?current_timestamp?comment?'創(chuàng)建時間',??
??`update_time`?timestamp?not?null?default?current_timestamp?on?update?current_timestamp?comment?'修改時間',??
????primary?key(`id`),??
????INDEX?`liked_user_id`(`liked_user_id`),??
????INDEX?`liked_post_id`(`liked_post_id`)??
)?comment?'用戶點贊表';??
對應(yīng)的對象 UserLike
import?com.solo.coderiver.user.enums.LikedStatusEnum;??
import?lombok.Data;??
??
import?javax.persistence.Entity;??
import?javax.persistence.GeneratedValue;??
import?javax.persistence.GenerationType;??
import?javax.persistence.Id;??
??
/**??
?*?用戶點贊表??
?*/??
@Entity??
@Data??
public?class?UserLike?{??
??
????//主鍵id??
????@Id??
????@GeneratedValue(strategy?=?GenerationType.IDENTITY)??
????private?Integer?id;??
??
????//被點贊的用戶的id??
????private?String?likedUserId;??
??
????//點贊的用戶的id??
????private?String?likedPostId;??
??
????//點贊的狀態(tài).默認未點贊??
????private?Integer?status?=?LikedStatusEnum.UNLIKE.getCode();??
??
????public?UserLike()?{??
????}??
??
????public?UserLike(String?likedUserId,?String?likedPostId,?Integer?status)?{??
????????this.likedUserId?=?likedUserId;??
????????this.likedPostId?=?likedPostId;??
????????this.status?=?status;??
????}??
}??
三、數(shù)據(jù)庫操作
操作數(shù)據(jù)庫同樣封裝在接口中
LikedService
import?com.solo.coderiver.user.dataobject.UserLike;??
import?org.springframework.data.domain.Page;??
import?org.springframework.data.domain.Pageable;??
??
import?java.util.List;??
??
public?interface?LikedService?{??
??
????/**??
?????*?保存點贊記錄??
?????*?@param?userLike??
?????*?@return??
?????*/??
????UserLike?save(UserLike?userLike);??
??
????/**??
?????*?批量保存或修改??
?????*?@param?list??
?????*/??
????List?saveAll(List?list) ;??
??
??
????/**??
?????*?根據(jù)被點贊人的id查詢點贊列表（即查詢都誰給這個人點贊過）??
?????*?@param?likedUserId?被點贊人的id??
?????*?@param?pageable??
?????*?@return??
?????*/??
????Page?getLikedListByLikedUserId(String?likedUserId,?Pageable?pageable) ;??
??
????/**??
?????*?根據(jù)點贊人的id查詢點贊列表（即查詢這個人都給誰點贊過）??
?????*?@param?likedPostId??
?????*?@param?pageable??
?????*?@return??
?????*/??
????Page?getLikedListByLikedPostId(String?likedPostId,?Pageable?pageable) ;??
??
????/**??
?????*?通過被點贊人和點贊人id查詢是否存在點贊記錄??
?????*?@param?likedUserId??
?????*?@param?likedPostId??
?????*?@return??
?????*/??
????UserLike?getByLikedUserIdAndLikedPostId(String?likedUserId,?String?likedPostId);??
??
????/**??
?????*?將Redis里的點贊數(shù)據(jù)存入數(shù)據(jù)庫中??
?????*/??
????void?transLikedFromRedis2DB();??
??
????/**??
?????*?將Redis中的點贊數(shù)量數(shù)據(jù)存入數(shù)據(jù)庫??
?????*/??
????void?transLikedCountFromRedis2DB();??
??
}??
LikedServiceImpl 實現(xiàn)類
import?com.solo.coderiver.user.dataobject.UserInfo;??
import?com.solo.coderiver.user.dataobject.UserLike;??
import?com.solo.coderiver.user.dto.LikedCountDTO;??
import?com.solo.coderiver.user.enums.LikedStatusEnum;??
import?com.solo.coderiver.user.repository.UserLikeRepository;??
import?com.solo.coderiver.user.service.LikedService;??
import?com.solo.coderiver.user.service.RedisService;??
import?com.solo.coderiver.user.service.UserService;??
import?lombok.extern.slf4j.Slf4j;??
import?org.springframework.beans.factory.annotation.Autowired;??
import?org.springframework.data.domain.Page;??
import?org.springframework.data.domain.Pageable;??
import?org.springframework.stereotype.Service;??
import?org.springframework.transaction.annotation.Transactional;??
??
import?java.util.List;??
??
@Service??
@Slf4j??
public?class?LikedServiceImpl?implements?LikedService?{??
??
????@Autowired??
????UserLikeRepository?likeRepository;??
??
????@Autowired??
????RedisService?redisService;??
??
????@Autowired??
????UserService?userService;??
??
????@Override??
????@Transactional??
????public?UserLike?save(UserLike?userLike)?{??
????????return?likeRepository.save(userLike);??
????}??
??
????@Override??
????@Transactional??
????public?List?saveAll(List?list) ? {??
????????return?likeRepository.saveAll(list);??
????}??
??
????@Override??
????public?Page?getLikedListByLikedUserId(String?likedUserId,?Pageable?pageable)? {??
????????return?likeRepository.findByLikedUserIdAndStatus(likedUserId,?LikedStatusEnum.LIKE.getCode(),?pageable);??
????}??
??
????@Override??
????public?Page?getLikedListByLikedPostId(String?likedPostId,?Pageable?pageable)? {??
????????return?likeRepository.findByLikedPostIdAndStatus(likedPostId,?LikedStatusEnum.LIKE.getCode(),?pageable);??
????}??
??
????@Override??
????public?UserLike?getByLikedUserIdAndLikedPostId(String?likedUserId,?String?likedPostId)?{??
????????return?likeRepository.findByLikedUserIdAndLikedPostId(likedUserId,?likedPostId);??
????}??
??
????@Override??
????@Transactional??
????public?void?transLikedFromRedis2DB()?{??
????????List?list?=?redisService.getLikedDataFromRedis();??
????????for?(UserLike?like?:?list)?{??
????????????UserLike?ul?=?getByLikedUserIdAndLikedPostId(like.getLikedUserId(),?like.getLikedPostId());??
????????????if?(ul?==?null){??
????????????????//沒有記錄，直接存入??
????????????????save(like);??
????????????}else{??
????????????????//有記錄，需要更新??
????????????????ul.setStatus(like.getStatus());??
????????????????save(ul);??
????????????}??
????????}??
????}??
??
????@Override??
????@Transactional??
????public?void?transLikedCountFromRedis2DB()?{??
????????List?list?=?redisService.getLikedCountFromRedis();??
????????for?(LikedCountDTO?dto?:?list)?{??
????????????UserInfo?user?=?userService.findById(dto.getId());??
????????????//點贊數(shù)量屬于無關(guān)緊要的操作，出錯無需拋異常??
????????????if?(user?!=?null){??
????????????????Integer?likeNum?=?user.getLikeNum()?+?dto.getCount();??
????????????????user.setLikeNum(likeNum);??
????????????????//更新點贊數(shù)量??
????????????????userService.updateInfo(user);??
????????????}??
????????}??
????}??
}??
數(shù)據(jù)庫的操作就這些，主要還是增刪改查。
四、開啟定時任務(wù)持久化存儲到數(shù)據(jù)庫
定時任務(wù) Quartz 很強大，就用它了。
「Quartz 使用步驟：」
1.添加依賴
<dependency>??
????<groupId>org.springframework.bootgroupId>??
????<artifactId>spring-boot-starter-quartzartifactId>??
dependency>??
2.編寫配置文件
package?com.solo.coderiver.user.config;??
??
import?com.solo.coderiver.user.task.LikeTask;??
import?org.quartz.*;??
import?org.springframework.context.annotation.Bean;??
import?org.springframework.context.annotation.Configuration;??
??
@Configuration??
public?class?QuartzConfig?{??
??
????private?static?final?String?LIKE_TASK_IDENTITY?=?"LikeTaskQuartz";??
??
????@Bean??
????public?JobDetail?quartzDetail(){??
????????return?JobBuilder.newJob(LikeTask.class).withIdentity(LIKE_TASK_IDENTITY).storeDurably().build();??
????}??
??
????@Bean??
????public?Trigger?quartzTrigger(){??
????????SimpleScheduleBuilder?scheduleBuilder?=?SimpleScheduleBuilder.simpleSchedule()??
//????????????????.withIntervalInSeconds(10)??//設(shè)置時間周期單位秒??
????????????????.withIntervalInHours(2)??//兩個小時執(zhí)行一次??
????????????????.repeatForever();??
????????return?TriggerBuilder.newTrigger().forJob(quartzDetail())??
????????????????.withIdentity(LIKE_TASK_IDENTITY)??
????????????????.withSchedule(scheduleBuilder)??
????????????????.build();??
????}??
}??
3.編寫執(zhí)行任務(wù)的類繼承自 QuartzJobBean
package?com.solo.coderiver.user.task;??
??
import?com.solo.coderiver.user.service.LikedService;??
import?lombok.extern.slf4j.Slf4j;??
import?org.apache.commons.lang.time.DateUtils;??
import?org.quartz.JobExecutionContext;??
import?org.quartz.JobExecutionException;??
import?org.springframework.beans.factory.annotation.Autowired;??
import?org.springframework.scheduling.quartz.QuartzJobBean;??
??
import?java.text.SimpleDateFormat;??
import?java.util.Date;??
??
/**??
?*?點贊的定時任務(wù)??
?*/??
@Slf4j??
public?class?LikeTask?extends?QuartzJobBean?{??
??
????@Autowired??
????LikedService?likedService;??
??
????private?SimpleDateFormat?sdf?=?new?SimpleDateFormat("yyyy-MM-dd?HH:mm:ss");??
??
????@Override??
????protected?void?executeInternal(JobExecutionContext?jobExecutionContext)?throws?JobExecutionException?{??
??
????????log.info("LikeTask--------?{}",?sdf.format(new?Date()));??
??
????????//將?Redis?里的點贊信息同步到數(shù)據(jù)庫里??
????????likedService.transLikedFromRedis2DB();??
????????likedService.transLikedCountFromRedis2DB();??
????}??
}??
在定時任務(wù)中直接調(diào)用 LikedService 封裝的方法完成數(shù)據(jù)同步。
以上就是點贊功能的設(shè)計與實現(xiàn)，不足之處還請各位大佬多多指教。
另外，點贊/取消點贊跟點贊數(shù) +1/ -1應(yīng)該保證是原子操作，不然出現(xiàn)并發(fā)問題就會有兩條重復(fù)的點贊記錄，所以要給整個原子操作加鎖。
同時需要在Spring Boot 的系統(tǒng)關(guān)閉鉤子函數(shù)中補充同步redis中點贊數(shù)據(jù)到mysql中的過程 . 不然有可能出現(xiàn)距離上一次同步1小時59分的時候服務(wù)器更新，把整整兩小時的點贊數(shù)據(jù)都給清空了。如果點贊設(shè)計到比較重要活動業(yè)務(wù)的話這就很尷尬了。
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