@Cacheable和@CachePut存入redis的数据使用redisTemplate取出时为null的解决

当使用@Cacheable和@CachePut注解存数据到redis中时如果使用spring默认的redis key序列化方式时，使用redisTemplate取数据为null

@CacheConfig(cacheNames = "users")     存入redis users目录下取数据时的key为users::username
public interface UserRepository extends JpaRepository<User, Long> {
    @Query("from User u where u.username=:username")
    User findUser(@Param("username") String username);

    @Cacheable(key = "#p0")  //使用第一个参数作为key
    User findUserByUsername(String username);

    @CachePut(key = "#p0.username")
    User save(User user);
}

不配置redisTemplate的效果：

　　@Test
    public void before() {
        userRepository.save(new User("AAA", 10));
        System.out.println("直接从redis取数据：" + redisTemplate.opsForValue().get("users::AAA"));
    }
　　//Hibernate: insert into user (age, username) values (?, ?)

　　  //直接从redis取数据：null

配置redis key的序列化方式

@Configuration
public class RedisConfig {
     @Bean
    public RedisTemplate redisTemplate(RedisConnectionFactory redisConnectionFactory) {
        RedisTemplate redisTemplate = new RedisTemplate<>();
        redisTemplate.setConnectionFactory(redisConnectionFactory);
        GenericToStringSerializer<String> stringGenericToStringSerializer = new GenericToStringSerializer<>(String.class);
        redisTemplate.setKeySerializer(stringGenericToStringSerializer);
        redisTemplate.setHashKeySerializer(stringGenericToStringSerializer);
        redisTemplate.setStringSerializer(stringGenericToStringSerializer);
        redisTemplate.afterPropertiesSet();
        return redisTemplate;
    }        
}

配置完后打印结果

Hibernate: insert into user (age, username) values (?, ?)
直接从redis取数据：com.cw.study.domain.User@41cf4272

说明默认的redisTemplate序列化key的方式和@Cacheable、@CachePut序列化key的方式不同