SpringBoot操作Redis

SpringBoot專案中操作redis非常簡單,只需pom.xml新增依賴:

<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-data-redis</artifactId>
	<version>1.5.15.RELEASE</version>
</dependency>

在application.properties中新增:

# redis config
spring.redis.host=127.0.0.1
spring.redis.port=6379
spring.redis.pool.max-idle=8
spring.redis.pool.min-idle=0
spring.redis.pool.max-active=8
spring.redis.pool.max-wait=-1
spring.redis.database=0

SpringBoot會自動在容器中注入一個RedisTemplate<Object,Object>和StringRedisTemplate<Object,Object>,這個泛型在專案中使用起來非常不方便,需要大量的型別轉換,而且這個RedisTemplate並沒有配置key和value的序列化方式,直接使用會有許多坑,比如要使用redis的incr和decr時會丟擲異常。
所以，我們需要重新配置一個RedisTemplate<String,Object>，以方便我們使用：

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;
 

import org.springframework.data.redis.serializer.StringRedisSerializer;

import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;

@Configuration
public class RedisConfig {

    @Bean
    @SuppressWarnings("all")
    public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory factory) {

        RedisTemplate<String, Object> template = new RedisTemplate<String, Object>();

        template.setConnectionFactory(factory);

        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);

        StringRedisSerializer stringRedisSerializer = new StringRedisSerializer();

        template.setKeySerializer(stringRedisSerializer);

        template.setHashKeySerializer(stringRedisSerializer);

        template.setValueSerializer(jackson2JsonRedisSerializer);

        template.setHashValueSerializer(jackson2JsonRedisSerializer);

        template.afterPropertiesSet();

        return template;
    }
}