在Spring Boot应用程序中使用Redis缓存的步骤：
1.要获得Redis连接，我们可以使用Lettuce或Jedis客户端库，Spring Boot 2.0启动程序spring-boot-starter-data-redis默认使用了Lettuce。要获得Redis的池化连接工厂，我们需要在类路径上提供commons-pool2，下面展示使用Lettuce情况下的Maven依赖项配置：
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-pool2</artifactId>
</dependency>
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2.在application.properties中配置spring.redis.*前缀的参数：
spring.redis.host=localhost
spring.redis.port=6379
spring.redis.password=
spring.redis.lettuce.pool.max-active=7
spring.redis.lettuce.pool.max-idle=7
spring.redis.lettuce.pool.min-idle=2
spring.redis.lettuce.pool.max-wait=-1ms
spring.redis.lettuce.shutdown-timeout=200ms
spring.cache.redis.cache-null-values=false
spring.cache.redis.time-to-live=600000
spring.cache.redis.use-key-prefix=true
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3. 在 @SpringBootApplication类使用@EnableCaching激活Redis：
@SpringBootApplication
@EnableCaching
public class SpringBootAppStarter {
public static void main(String[] args) {
SpringApplication.run(SpringBootAppStarter.class, args);
}
}
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如果想用Jedis 客户端，需要排除Lettuce，加入Jedis:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
<exclusions>
<exclusion>
<groupId>io.lettuce</groupId>
<artifactId>lettuce-core</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
</dependency>
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jedis将自动在类路径上解决commons-pool2， application配置:
spring.redis.host=localhost
spring.redis.port=6379
spring.redis.password=
spring.redis.jedis.pool.max-active=7
spring.redis.jedis.pool.max-idle=7
spring.redis.jedis.pool.min-idle=2
spring.redis.jedis.pool.max-wait=-1ms
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