spring boot 缓存 | Redis 缓存
- spring boot
- 2020-06-08 21:55:47
- 浏览 364
简介可以将一些常用数据、高频数据缓存到 redis 中,减少数据库查询,提高访问速度
引入依赖
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
配置 Redis 连接
spring:
redis:
host: 192.168.1.254
port: 6379
配置 Redis 序列化使用 JSON
@EnableCaching
@Configuration
public class RedisConfig extends CachingConfigurerSupport {
@Bean
public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory factory) {
RedisTemplate<String, Object> template = new RedisTemplate<>();
RedisSerializer<String> redisSerializer = new StringRedisSerializer();
Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
ObjectMapper om = new ObjectMapper();
om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
jackson2JsonRedisSerializer.setObjectMapper(om);
template.setConnectionFactory(factory);
// key 序列化方式
template.setKeySerializer(redisSerializer);
// value 序列化
template.setValueSerializer(jackson2JsonRedisSerializer);
// value hashmap 序列化
template.setHashValueSerializer(jackson2JsonRedisSerializer);
return template;
}
@Bean
public CacheManager cacheManager(RedisConnectionFactory factory) {
RedisSerializer<String> redisSerializer = new StringRedisSerializer();
Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
//解决查询缓存转换异常的问题
ObjectMapper om = new ObjectMapper();
om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
jackson2JsonRedisSerializer.setObjectMapper(om);
// 配置序列化(解决乱码的问题),过期时间 1 小时
RedisCacheConfiguration config = RedisCacheConfiguration.defaultCacheConfig()
.entryTtl(Duration.ofHours(1))
.serializeKeysWith(RedisSerializationContext.SerializationPair.fromSerializer(redisSerializer))
.serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(jackson2JsonRedisSerializer))
.disableCachingNullValues();
RedisCacheManager cacheManager = RedisCacheManager.builder(factory)
.cacheDefaults(config)
.build();
return cacheManager;
}
}
查询缓存
@Cacheable(key = "#id", unless = "#result == null")
@Override
public User query(Integer id) {
log.info("执行查询");
User user = new User();
user.setId(id);
user.setName("蔡徐坤");
return user;
}
查看 redis 数据
修改缓存
@CachePut(key = "#user.id")
@Override
public User modify(User user) {
return user;
}
查看 redis 数据
删除缓存
@CacheEvict(key = "#id")
@Override
public void remove(Integer id) {
}
查看 redis 数据