Introduction to the method of integrating Redis cache with SpringBoot

How SpringBoot integrates Redis cache:

1. Introduce cache dependency

 org.springframework.boot spring-boot-starter-data-redis 2.1.5.RELEASE 

2. Add cache configuration

in application Add the following configuration to the .properties file

## Redis部分 # Redis服务器地址 spring.redis.host=${redis.host} # Redis服务器连接端口 spring.redis.port=${redis.port} # Redis服务器连接密码（默认为空） spring.redis.password=${redis.password} # 连接池最大连接数（使用负值表示没有限制） spring.redis.jedis.pool.max-active=${redis.maxTotal} # 连接池最大阻塞等待时间（使用负值表示没有限制） spring.redis.jedis.pool.max-wait=-1ms # 连接池中的最大空闲连接 spring.redis.jedis.pool.max-idle=${redis.maxIdle} # 连接池中的最小空闲连接 spring.redis.jedis.pool.min-idle=4 # 连接超时时间（毫秒） spring.redis.timeout=5000 ## Cache部分 #缓存的名称集合，多个采用逗号分割 spring.cache.cache-names= #缓存的类型，官方提供了很多，这里我们填写redis spring.cache.type=redis #是否缓存null数据，默认是false spring.cache.redis.cache-null-values=false #redis中缓存超时的时间，默认60000ms spring.cache.redis.time-to-live=60000 #缓存数据key是否使用前缀，默认是true spring.cache.redis.use-key-prefix=true #缓存数据key的前缀，在上面的配置为true时有效， spring.cache.redis.key-prefix=

3. Add the enable caching annotation EnableCaching

@EnableCaching public class WebApplication { public static void main(String[] args) { SpringApplication.run(WebApplication.class, args); } }

4. Add the caching annotation

@Cacheable

The annotation’s function It indicates that the return value of this method will be cached;

You need to pay attention to condition and unless, they are both conditional judgment parameters:

• condition: judge before calling the method , so the result value of the method cannot be used as a judgment condition;

• unless: judgment is made after the method is called. At this time, the method return value can be obtained as a judgment condition.

So the operation that relies on the method return value as whether to cache must use the unless parameter instead of condition

@CachePut

Update the method return value Current cache

@CacheEvict

Expire (clear) the current cache

For more related knowledge, please pay attention toredis introductory tutorialcolumn

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