Springboot整合redis實現(xiàn)緩存

引入依賴

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-cache</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>

配置RedisConfig

@EnableCaching
@Configuration
public class RedisConfig {

    @Bean
    RedisCacheConfiguration redisCacheConfiguration() {
        // 讀取redis的默認配置模板
        RedisCacheConfiguration config = RedisCacheConfiguration.defaultCacheConfig();

        // 設(shè)置過期時間
        config = config.entryTtl(Duration.ofDays(1));

        // 設(shè)置KEY的前綴
        config.prefixKeysWith("CACHE_");
        // 開啟使用KEY前綴
        config.usePrefix();

        // 設(shè)置允許緩存空值，防止緩存穿透
        config.getAllowCacheNullValues();

        // 配置key的序列化方式
        config.serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(new StringRedisSerializer()));

        // 配置value的序列化方式
        config = config.serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(new GenericJackson2JsonRedisSerializer()));

        return config;
    }

}

RedisTemplate常用方法
redisTemplate.opsForValue();//操作字符串
redisTemplate.opsForHash();//操作hash
redisTemplate.opsForList();//操作list
redisTemplate.opsForSet();//操作set
redisTemplate.opsForZSet();//操作有序set

Redis常用緩存注解

注解名 作用
@Cacheable  主要針對方法配置添吗，能夠根據(jù)方法的請求參數(shù)對其結(jié)果進行緩存
@CacheEvict 清空緩存
@CachePut   保證方法被調(diào)用沥曹，又希望結(jié)果被緩存
@EnableCaching  開啟基于注解的緩存

解決緩存穿透、緩存雪崩碟联、緩存擊穿

1. 空結(jié)果緩存：解決緩存穿透問題
2. 設(shè)置過期時間加隨機值：解決緩存雪崩
3. 加鎖：解決緩存擊穿

Redisson整合 可重入鎖 讀寫鎖

官網(wǎng)地址 github redisson wiki

導(dǎo)入依賴

        <dependency>
            <groupId>org.redisson</groupId>
            <artifactId>redisson-spring-boot-starter</artifactId>
             <!--適用于2.2.x版本-->
            <version>3.13.1</version>
        </dependency>

配置RedissonConfig

@Configuration
public class RedissonConfig {

    @Bean
    public RedissonClient redisson() {
        //1. 創(chuàng)建配置
        Config config = new Config();
        config.useSingleServer().setAddress("redis://192.168.56.10:6379");
        // 2. 根據(jù)config創(chuàng)建出RedissonClient實例
        RedissonClient redisson = Redisson.create(config);
        return redisson;
    }

}

可重入鎖

RLock rLock = redissonClient.getLock("lock");
rLock.lock();
rLock.unlock();

讀寫鎖

    // 讀
    @GetMapping("read")
    public R read() {
        RLock lock = redissonClient.getReadWriteLock("rw-lock").readLock();
        try {
            lock.lock();
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
        return R.ok().data("data", "read");
    }

    // 寫
    @GetMapping("write")
    public R write() {
        RLock lock = redissonClient.getReadWriteLock("rw-lock").writeLock();
        try {
            lock.lock();
            Thread.sleep(8000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
        return R.ok().data("data", "write");
    }