JedisCluster實現redis的keys命令的方法_redis

由於JedisCluster沒有提供對keys命令的封裝，只能自己實現：

先定義介面。使用TreeSet返回，是為了可以方便地利用它的first()方法：

public interface IRedisOperator {/** * 根據pattern 擷取所有的keys * @param pattern * @return */TreeSet<String> keys(String pattern);}

實作類別：

public class RedisOperator implements IRedisOperator {public final static Logger logger = LoggerFactory.getLogger(RedisOperator.class);@Autowiredprivate JedisCluster jedisCluster;@Overridepublic TreeSet<String> keys(String pattern){logger.debug("Start getting keys...");TreeSet<String> keys = new TreeSet<>();Map<String, JedisPool> clusterNodes = jedisCluster.getClusterNodes();for(String k : clusterNodes.keySet()){logger.debug("Getting keys from: {}", k);JedisPool jp = clusterNodes.get(k);Jedis connection = jp.getResource();try {keys.addAll(connection.keys(pattern));} catch(Exception e){logger.error("Getting keys error: {}", e);} finally{logger.debug("Connection closed.");connection.close();//用完一定要close這個連結。。。}}logger.debug("Keys gotten!");return keys;}}

調用：

TreeSet<String> keys = redisOperator.keys(prefix);Map<String, Object> data = new LinkedHashMap<>();data.put("prefix", prefix);data.put("count", keys.size());String type = "unknown";if(keys.size()>0){type = redisOperator.type(keys.first());}data.put("type", type);