Redis实现全局唯一id生成

　　Redis实现全局唯一id生成
　　废话不多说直接上代码 import org.springframework.beans.factory.annotation.Autowired; import org.springframework.data.redis.core.RedisTemplate; import org.springframework.stereotype.Component; import org.springframework.util.Assert;  import java.time.LocalDate; import java.time.format.DateTimeFormatter; import java.util.Calendar; import java.util.concurrent.TimeUnit;  /**  * 描述:  * 唯一ID生成器  * @author jimmy  * @create 2020-11-06 16:06  */ @Component public class GenerateIDUtil {      @Autowired     private RedisTemplate redisTemplate;      /**      * 生成每天的初始Id      * @param key      * @return      */  public String initPrimaryId(String key) {         Assert.hasLength(key, ＂hashName不能为空＂);         String hashCol = LocalDate.now().format(DateTimeFormatter.ofPattern(＂yyyyMMdd＂));         //自定义编号规则         String hashColVal = hashCol + ＂00001＂; //        redisTemplate.opsForHash().putIfAbsent(hashName, hashCol, hashColVal);          Long expiresTime = getSecondsNextEarlyMorning();         redisTemplate.opsForValue().set(key, Long.valueOf(hashColVal), expiresTime, TimeUnit.SECONDS);         return hashColVal;     }       /**      * 获取分布式Id           * @param key      * @return      */     public String getPrimaryId(String key) {          String id = ＂＂;         if(redisTemplate.hasKey(key)){             // redisTemplate.opsForValue().get(key);             // redisTemplate.delete(key);             id = String.valueOf(redisTemplate.opsForValue().increment(key, 1));         } else {             id = initPrimaryId(key);         }         return id;     }       /**      * 判断当前时间距离第二天凌晨的秒数      * @return 返回值单位为[s:秒]      */     public Long getSecondsNextEarlyMorning() {         Calendar cal = Calendar.getInstance();         cal.add(Calendar.DAY_OF_YEAR, 1);         cal.set(Calendar.HOUR_OF_DAY, 0);         cal.set(Calendar.SECOND, 0);         cal.set(Calendar.MINUTE, 0);         cal.set(Calendar.MILLISECOND, 0);         return (cal.getTimeInMillis() - System.currentTimeMillis()) / 1000;     } }
　　写法很简单，没什么可说的。