Introduction to the method of integrating Redis cache with SpringBoot

How SpringBoot integrates Redis cache:

1. Introduce cache dependency

<dependency>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-data-redis</artifactId>
     <version>2.1.5.RELEASE</version>
</dependency>

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 to redis introductory tutorialcolumn

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