前期準(zhǔn)備工作（如無需要可直接跳過）

redis安裝

具體的安裝教程可參考之前的章節(jié)（http://www.reibang.com/p/91f90adb782f）

啟動(dòng)redis server（如果沒有redis install角雷，可在src目錄下找到啟動(dòng)命令）

執(zhí)行bin/redis-server命令矢沿，出現(xiàn)如下圖就說明啟動(dòng)成功

redis server啟動(dòng)

bin/redis-server命令后面可以指定redis的配置文件（配置文件中配置了一些參數(shù)）坞淮，具體的配置文件可關(guān)注博主菱蔬，后期會(huì)不斷更新麦牺，共同進(jìn)步寒亥；

啟動(dòng)redis client（如果沒有redis install洒忧，可在src目錄下找到啟動(dòng)命令）

執(zhí)行bin/redis-cli [-h ip] [-p port]运授，出現(xiàn)如下圖所示說明客戶端啟動(dòng)并連接成功

redis client啟動(dòng)

ping測(cè)試連接

redis的五種類型

• string：字符串類型
• list：列表
• hash：hash吁朦，類似于Java中的hashMap數(shù)據(jù)結(jié)構(gòu)
  • 有序柒室，順序?yàn)椴迦氲捻樞?/li>
  • 允許重復(fù)值
• set：無序去重列表，與Java中的set類似
  • 無序
  • 對(duì)值進(jìn)行去重
• zset（sorted set）：有序去重列表
  • 結(jié)構(gòu)體中有score的值逗宜，會(huì)根據(jù)這個(gè)score的值進(jìn)行排序
  • 對(duì)值進(jìn)行去重

string

部分基本命令

提示：可使用help @string查看所有string的相關(guān)命令以使用語法與含義空骚；

應(yīng)用場(chǎng)景

• 分布式鎖的實(shí)現(xiàn)（簡(jiǎn)易版jedis）

public class SimpleDistributedLock {
    // treadcount
    private static final int threadCount = 100;
    private static CountDownLatch countDownLatch = new CountDownLatch(threadCount);
    // 1000個(gè)庫存
    private static int inv = 1;
    // 鎖的key
    private static final String lockKey = "distributedLock:simple";
    // 鎖超時(shí)時(shí)間
    private static final long expireSeconds = 10;
    // redisson
    private static RedissonClient redissonClient;
    // redis host
    private static final String redisHost = "127.0.0.1";
    // redis port
    private static final int redisPort = 6379;
    // 初始化連接redis
    static {
        Config config = new Config();
        config.useSingleServer().setAddress(redisHost + ":" + redisPort);
        redissonClient = Redisson.create(config);
    }
    public static void main(String[] args) throws InterruptedException {
        // 模擬并發(fā) 扣減庫存
        for (int i = 0; i < threadCount; i++) {
            new Thread(() -> {
                RLock lock = redissonClient.getLock(lockKey);
                try {
                    // 設(shè)置過期時(shí)間 并 加鎖（獲取鎖）
                    lock.lock(expireSeconds, TimeUnit.SECONDS);
                    // 業(yè)務(wù) 扣減庫存
                    if (inv > 0) {
                        inv--;
                    }

                } catch (Exception e) {
                    // 回滾業(yè)務(wù)操作
                } finally {
                    lock.unlock();
                    countDownLatch.countDown();
                }
            }).start();
        }
        countDownLatch.await();
        System.out.println(inv);
        redissonClient.shutdown();
    }
}

• 分布式計(jì)數(shù)器

public class Counter {
    private static int count = 0;
    // treadcount
    private static final int threadCount = 100;
    private static CountDownLatch countDownLatch = new CountDownLatch(threadCount);
    // 鎖的key
    private static final String lockKey = "distributedLock:simple";
    // 鎖超時(shí)時(shí)間
    private static final long expireSeconds = 10;
    // redisson
    private static RedissonClient redissonClient;
    // redis host
    private static final String redisHost = "127.0.0.1";
    // redis port
    private static final int redisPort = 6379;
    // 初始化連接redis
    static {
        Config config = new Config();
        config.useSingleServer().setAddress(redisHost + ":" + redisPort);
        redissonClient = Redisson.create(config);
    }
    public static void main(String[] args) throws InterruptedException {
        for (int i = 0; i < threadCount; i++) {
            new Thread(() -> {
                RLock lock = redissonClient.getLock(lockKey);
                try {
                    lock.lock(expireSeconds, TimeUnit.SECONDS);
                    // 業(yè)務(wù)操作
                    count++;
                } finally {
                    countDownLatch.countDown();
                    lock.unlock();
                }
            }).start();
        }
        countDownLatch.await();
        System.out.println(count);
        redissonClient.shutdown();
    }
}

• 統(tǒng)計(jì)用戶一年內(nèi)的登錄情況

# uid為key，每一位代表著一年中的一天
# 2016123240用戶在第一天登錄過
127.0.0.1:6379> SETBIT uid_2016123240 0 1
(integer) 0
# 2016123240用戶在第八天登錄過
127.0.0.1:6379> SETBIT uid_2016123240 7 1
(integer) 0
# 2016123240用戶在第二十二天登錄過
127.0.0.1:6379> SETBIT uid_2016123240 21 1
(integer) 0
# 2016123240用戶在第三十一天登錄過
127.0.0.1:6379> SETBIT uid_2016123240 30 1
(integer) 0
# 2016123240用戶在第五十六天登錄過
127.0.0.1:6379> SETBIT uid_2016123240 55 1
(integer) 0
# 2016123240用戶在第三百六十六天登錄過
127.0.0.1:6379> SETBIT uid_2016123240 365 1
(integer) 0
# 獲取2016123240用戶在這一年內(nèi)的登錄次數(shù)
127.0.0.1:6379> BITCOUNT uid_2016123240 0 -1
(integer) 6

• 統(tǒng)計(jì)近7天登錄過的用戶數(shù)

127.0.0.1:6379> SETBIT 20210628 1 1
(integer) 0
127.0.0.1:6379> SETBIT 20210628 2 1
(integer) 0
127.0.0.1:6379> SETBIT 20210628 3 1
(integer) 0
127.0.0.1:6379> SETBIT 20210628 4 1
(integer) 0
127.0.0.1:6379> SETBIT 20210629 1 1
(integer) 0
127.0.0.1:6379> SETBIT 20210629 6 1
(integer) 0
127.0.0.1:6379> SETBIT 20210629 5 1
(integer) 0
127.0.0.1:6379> SETBIT 20210629 2 1
(integer) 0
127.0.0.1:6379> SETBIT 20210630 2 1
(integer) 0
127.0.0.1:6379> SETBIT 20210630 1 1
(integer) 0
127.0.0.1:6379> SETBIT 20210630 9 1
(integer) 0
127.0.0.1:6379> SETBIT 20210630 5 1
(integer) 0
127.0.0.1:6379> SETBIT 20210701 1 1
(integer) 0
127.0.0.1:6379> SETBIT 20210701 6 1
(integer) 0
127.0.0.1:6379> SETBIT 20210701 3 1
(integer) 0
127.0.0.1:6379> SETBIT 20210701 2 1
(integer) 0
127.0.0.1:6379> SETBIT 20210702 1 1
(integer) 0
127.0.0.1:6379> SETBIT 20210702 2 1
(integer) 0
127.0.0.1:6379> SETBIT 20210702 10 1
(integer) 0
127.0.0.1:6379> SETBIT 20210703 1 1
(integer) 0
127.0.0.1:6379> SETBIT 20210703 2 1
(integer) 0
127.0.0.1:6379> SETBIT 20210703 6 1
(integer) 0
127.0.0.1:6379> SETBIT 20210704 1 1
(integer) 0
127.0.0.1:6379> BITOP or orResult 20210628 20210629 20210630 20210701 20210702 20210703 20210704
(integer) 2
127.0.0.1:6379> BITCOUNT orResult 0 -1
(integer) 8

• 統(tǒng)計(jì)最近7天連續(xù)登錄的用戶數(shù)

127.0.0.1:6379> SETBIT 20210628 1 1
(integer) 0
127.0.0.1:6379> SETBIT 20210628 2 1
(integer) 0
127.0.0.1:6379> SETBIT 20210628 3 1
(integer) 0
127.0.0.1:6379> SETBIT 20210628 4 1
(integer) 0
127.0.0.1:6379> SETBIT 20210629 1 1
(integer) 0
127.0.0.1:6379> SETBIT 20210629 6 1
(integer) 0
127.0.0.1:6379> SETBIT 20210629 5 1
(integer) 0
127.0.0.1:6379> SETBIT 20210629 2 1
(integer) 0
127.0.0.1:6379> SETBIT 20210630 2 1
(integer) 0
127.0.0.1:6379> SETBIT 20210630 1 1
(integer) 0
127.0.0.1:6379> SETBIT 20210630 9 1
(integer) 0
127.0.0.1:6379> SETBIT 20210630 5 1
(integer) 0
127.0.0.1:6379> SETBIT 20210701 1 1
(integer) 0
127.0.0.1:6379> SETBIT 20210701 6 1
(integer) 0
127.0.0.1:6379> SETBIT 20210701 3 1
(integer) 0
127.0.0.1:6379> SETBIT 20210701 2 1
(integer) 0
127.0.0.1:6379> SETBIT 20210702 1 1
(integer) 0
127.0.0.1:6379> SETBIT 20210702 2 1
(integer) 0
127.0.0.1:6379> SETBIT 20210702 10 1
(integer) 0
127.0.0.1:6379> SETBIT 20210703 1 1
(integer) 0
127.0.0.1:6379> SETBIT 20210703 2 1
(integer) 0
127.0.0.1:6379> SETBIT 20210703 6 1
(integer) 0
127.0.0.1:6379> SETBIT 20210704 1 1
(integer) 0
127.0.0.1:6379> BITOP and andResult 20210628 20210629 20210630 20210701 20210702 20210703 20210704
(integer) 2
127.0.0.1:6379> BITCOUNT andResult 0 -1
(integer) 1

list

部分基本命令

應(yīng)用場(chǎng)景

• 消息隊(duì)列：主要是通過blpush+brpop實(shí)現(xiàn)肋坚；
• 常用數(shù)據(jù)結(jié)構(gòu)實(shí)現(xiàn)
  • lpush + rpop 實(shí)現(xiàn)隊(duì)列；
  • lpush + lpop 實(shí)現(xiàn)棧肃廓；

hash

部分基本命令

應(yīng)用場(chǎng)景

• 存儲(chǔ)對(duì)象（object）：set user name zhangsan age 13
• 購(gòu)物車：
  • 添加到購(gòu)物車：hset shop_car product_1001 1
  • 增加商品個(gè)數(shù)：hincrby shop_car product_1001 2
  • 刪除商品：hdel shop_car product_1001
  • 計(jì)算購(gòu)物車商品種類數(shù)：hlen shop_car

set

部分基本命令

應(yīng)用場(chǎng)景

• 微博關(guān)注/粉絲列表：sadd follow 1 2 3/ sadd fans 1 2 3
• 共同關(guān)注列表：sinter follow1 follow2
• 猜你喜歡：sdiff follow1 follow2
• 隨機(jī)抽獎(jiǎng)：spop award_pool 10

zset

部分基本命令

應(yīng)用場(chǎng)景

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