pom.xml

<!--redis-->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>

application.yml:

redis:
      #資料庫索引
      database: 0
      host: 47.101.172.217
      port: 6379
      password:
      lettuce:
        pool:
          #最大連線數
          max-active: 8
          #最大阻塞等待時間(負數表示沒限制)
          max-wait: -1
          #最大空閒
          max-idle: 8
          #最小空閒
          min-idle: 0
      #連線超時時間
      timeout: 10000

RedisConfig.java:

@Configuration
@EnableCaching
public class RedisConfig extends CachingConfigurerSupport {



    /**
     * json序列化
     * @return
     */
    @Bean
    public RedisSerializer<Object> jackson2JsonRedisSerializer() {
        //使用Jackson2JsonRedisSerializer來序列化和反序列化redis的value值
        Jackson2JsonRedisSerializer serializer = new Jackson2JsonRedisSerializer(Object.class);

        ObjectMapper mapper = new ObjectMapper();
        mapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        mapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
        serializer.setObjectMapper(mapper);
        return serializer;
    }

    @Bean
    public RedisTemplate<String, Object> redisTemplate(LettuceConnectionFactory lettuceConnectionFactory) {
        //StringRedisTemplate的構造方法中預設設定了stringSerializer
        RedisTemplate<String, Object> template = new RedisTemplate<>();
        //set key serializer
        StringRedisSerializer stringRedisSerializer = new StringRedisSerializer();
        template.setKeySerializer(stringRedisSerializer);
        template.setHashKeySerializer(stringRedisSerializer);


        //set value serializer
        template.setDefaultSerializer(jackson2JsonRedisSerializer());

        template.setConnectionFactory(lettuceConnectionFactory);
        template.afterPropertiesSet();
        return template;
    }

    @Bean
    public StringRedisTemplate stringRedisTemplate(LettuceConnectionFactory lettuceConnectionFactory) {
        StringRedisTemplate template = new StringRedisTemplate();
        template.setConnectionFactory(lettuceConnectionFactory);
        return template;
    }
    /**
     * 在使用@Cacheable時，如果不指定key，則使用找個預設的key生成器生成的key
     *
     */
    @Override
    @Bean
    public SimpleKeyGenerator keyGenerator() {
        return new SimpleKeyGenerator() {

            @Override
            public Object generate(Object target, Method method, Object... params) {
                StringBuilder sb = new StringBuilder();
                sb.append(target.getClass().getName());
                sb.append(".").append(method.getName());

                StringBuilder paramsSb = new StringBuilder();
                for (Object param : params) {
                    // 如果不指定，預設生成包含到鍵值中
                    if (param != null) {
                        paramsSb.append(param.toString());
                    }
                }

                if (paramsSb.length() > 0) {
                    sb.append("_").append(paramsSb);
                }
                return sb.toString();
            }

        };

    }

    /**
     * 管理快取
     *
     * @param lettuceConnectionFactory
     * @return
     */
    //快取管理器
    @Bean
    public CacheManager cacheManager(LettuceConnectionFactory lettuceConnectionFactory) {
        // 生成一個預設配置，通過config物件即可對快取進行自定義配置
        RedisCacheConfiguration config = RedisCacheConfiguration.defaultCacheConfig();

        // 設定快取的預設過期時間，也是使用Duration設定
        config = config.entryTtl(Duration.ofMinutes(1))
                // 設定 key為string序列化
                .serializeKeysWith(RedisSerializationContext.SerializationPair.fromSerializer(new StringRedisSerializer()))
                // 設定value為json序列化
                .serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(jackson2JsonRedisSerializer() ))
                // 不快取空值
                .disableCachingNullValues();

        // 設定一個初始化的快取空間set集合
        Set<String> cacheNames = new HashSet<>();
        cacheNames.add("company_goods_info");

        // 對每個快取空間應用不同的配置
        Map<String, RedisCacheConfiguration> configMap = new HashMap<>();
        configMap.put("company_goods_info", config);

        // 使用自定義的快取配置初始化一個cacheManager
        RedisCacheManager cacheManager = RedisCacheManager.builder(lettuceConnectionFactory)
                // 一定要先呼叫該方法設定初始化的快取名，再初始化相關的配置
                .initialCacheNames(cacheNames)
                .withInitialCacheConfigurations(configMap)
                .build();
        return cacheManager;
    }
}