Spring Boot 2.0 实践：Redis

最新推荐文章于 2021-02-16 22:40:50 发布

原创最新推荐文章于 2021-02-16 22:40:50 发布 · 187 阅读

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#Spring Boot #Redis #Cache

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本文介绍了如何在Spring Boot 2.0中整合Redis，包括添加Maven依赖，配置application.properties，自定义配置RedisTemplate和RedisCacheConfiguration。通过直接使用注入的redisTemplate进行操作，如opsForValue().set()，或者利用@Cacheable注解实现缓存功能。同时，文章提到，如果需要自定义RedisTemplate的行为或缓存注解的行为，需要相应地配置细节，特别是RedisCacheConfiguration中的序列化设置。

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Redis常用cmd：

PS C:\Program Files\Redis> .\redis-cli.exe -h 127.0.0.1 -p 6379 -a 123456
> SELECT 0
> keys *
> type "aaa"
> hkeys "aaa"
> hgetall "aaa"
> get "aaa"

maven依赖：

        <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>

application.properties：

spring.redis.host=127.0.0.1
spring.redis.port=6379
spring.redis.password=123456
spring.redis.database=2
spring.redis.lettuce.pool.max-active=8
spring.redis.lettuce.pool.max-wait=-1
spring.redis.lettuce.pool.max-idle=8
spring.redis.lettuce.pool.min-idle=0
spring.redis.timeout=3600ms

自定义配置：

@Configuration
@EnableCaching
public class RedisConfig extends CachingConfigurerSupport {

	@Bean
	public RedisTemplate redisTemplate(RedisConnectionFactory redisConnectionFactory) {
		RedisTemplate redisTemplate = new RedisTemplate();
		redisTemplate.setConnectionFactory(redisConnectionFactory);

		Jackson2JsonRedisSerializer<Object> jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer<>(
				Object.class);
		ObjectMapper objectMapper = new ObjectMapper();
		objectMapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
		objectMapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
		jackson2JsonRedisSerializer.setObjectMapper(objectMapper);

		redisTemplate.setKeySerializer(new StringRedisSerializer());
		redisTemplate.setValueSerializer(jackson2JsonRedisSerializer);
		return redisTemplate;
	}

	@Bean
	public RedisCacheConfiguration redisCacheConfiguration() {
		Jackson2JsonRedisSerializer<Object> jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer<>(
				Object.class);

		ObjectMapper objectMapper = new ObjectMapper();
		objectMapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
		objectMapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);

		jackson2JsonRedisSerializer.setObjectMapper(objectMapper);

		RedisCacheConfiguration configuration = RedisCacheConfiguration.defaultCacheConfig();
		configuration = configuration
				.serializeValuesWith(
						RedisSerializationContext.SerializationPair.fromSerializer(jackson2JsonRedisSerializer))
				.entryTtl(Duration.ofDays(30));

		return configuration;
	}
}

用法：

直接用注入的redisTemplate操作，如opsForValue().set()。此时若要自定义其行为，需要上述配置中的redisTemplate()方法。
用@Cacheable等注解。此时若要自定义，需要配置上述redisCacheConfiguration()部分。因为注解执行不是直接使用redisTemplate，而是使用RedisCacheConfiguration中CacheManager中的属性，例如序列化。详细可参考：springboot cache缓存注解源码解析