是以太山不让土壤，故能成其大；河海不择细流，故能就其深。------李斯

多用于排行榜、统计访问量、签到天数等场景

|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 | hljs java package com.ruben; import org.junit.jupiter.api.Test; import org.springframework.boot.test.context.SpringBootTest; import org.springframework.context.annotation.DependsOn; import org.springframework.data.redis.core.StringRedisTemplate; import org.springframework.data.redis.support.atomic.RedisAtomicLong; import org.springframework.test.annotation.Rollback; import javax.annotation.Resource; import java.math.BigDecimal; import java.time.Duration; import java.time.temporal.ChronoUnit; import java.util.Optional; import java.util.concurrent.TimeUnit; /** * 我还没有写描述 * * @author <achao1441470436@gmail.com> * @date 2021/4/29 0029 22:37 */ @SpringBootTest @Rollback(false) public class RedisDemo { @Resource private StringRedisTemplate stringRedisTemplate; @Test public void redisIncrementDemo() { RedisAtomicLong redisAtomicLong = Optional.ofNullable(stringRedisTemplate.getConnectionFactory()).map(factory -> new RedisAtomicLong("ruben", factory)).orElseThrow(() -> new RuntimeException("redis获取连接失败")); // 自增并获取 类比 ++i long longValue = redisAtomicLong.incrementAndGet(); System.out.println("自增并获取" + longValue); // 1 // 获取并自增 类比 i++ longValue = redisAtomicLong.getAndIncrement(); System.out.println("获取并自增" + longValue); // 1 // 相加并获取 类比 += longValue = redisAtomicLong.addAndGet(2L); System.out.println("相加并获取" + longValue); // 4 // 修改并获取 longValue = redisAtomicLong.updateAndGet(i -> i + 2); System.out.println("修改并获取" + longValue); // 6 // 自减并获取 类比 --i longValue = redisAtomicLong.decrementAndGet(); System.out.println("自减并获取" + longValue); // 5 // 计算和5的最大值并获取 longValue = redisAtomicLong.accumulateAndGet(6L, Long::max); System.out.println("计算和5的最大值并获取" + longValue); // 6 // 计算两数相乘并获取 longValue = redisAtomicLong.accumulateAndGet(5L, (left, right) -> new BigDecimal(left).multiply(new BigDecimal(right)).longValue()); System.out.println("计算两数相乘并获取" + longValue); // 30 // 直接设置值（这里我们设为0表示重置） redisAtomicLong.set(0L); // 直接获取 longValue = redisAtomicLong.get(); System.out.println("获取" + longValue); // 0 // 设置过期时间30秒 过期后清除 redisAtomicLong.expire(30, TimeUnit.SECONDS); redisAtomicLong.expire(Duration.of(30, ChronoUnit.SECONDS)); // 获取过期时间 Long expire = redisAtomicLong.getExpire(); System.out.println("获取过期时间" + expire); // 30 } } |

写的应该是比较全了，常用的都放这里了