用spring查询redis的bitmap数据

1. 引入依赖

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

2. 配置Redis连接

spring:
  redis:
    host: localhost
    port: 6379

3. 定义RedisTemplate

@Configuration
public class RedisConfig {
    @Autowired
    private RedisConnectionFactory redisConnectionFactory;

    @Bean
    public RedisTemplate<String, Object> redisTemplate() {
        RedisTemplate<String, Object> redisTemplate = new RedisTemplate<>();
        redisTemplate.setConnectionFactory(redisConnectionFactory);
        redisTemplate.setKeySerializer(new StringRedisSerializer());
        redisTemplate.setValueSerializer(new GenericJackson2JsonRedisSerializer());
        redisTemplate.setHashKeySerializer(new StringRedisSerializer());
        redisTemplate.setHashValueSerializer(new GenericJackson2JsonRedisSerializer());
        return redisTemplate;
    }
}

4. 查询bitmap数据

@Autowired
private RedisTemplate<String, Object> redisTemplate;

public List<Integer> queryBitMap(String key) {
    List<Integer> result = new ArrayList<>();
    RedisConnection connection = redisTemplate.getConnectionFactory().getConnection();
    try {
        byte[] bytes = connection.get(key.getBytes());
        if (bytes != null) {
            BitArray bitArray = BitArrayUtils.createBitArray(bytes);
            for (int i = bitArray.nextSetBit(0); i >= 0; i = bitArray.nextSetBit(i + 1)) {
                result.add(i);
            }
        }
    } finally {
        connection.close();
    }
    return result;
}

其中，BitArrayUtils.createBitArray(bytes)是一个自定义的工具类，用于将字节数组转化为BitArray对象。BitArray是commons-lang3库中的一个类，用于操作位集合。