现阶段，互联网越来越热，高并发的设计越来越高，大多数开发者都开始使用redis作为中间件，用以解决高并发的问题。jedis作为redis的客户端，使用也是越来越频繁。很多开发者都注意到了无论是在单机模式还是分布式模式下，jedis获得链接完成操作后，都必须主动归还（也就是做链接的关闭）动作。为什么呢？

查看jedis源码不难发现其缘由。

public class Jedis extends BinaryJedis implements JedisCommands, MultiKeyCommands,AdvancedJedisCommands, ScriptingCommands, BasicCommands, ClusterCommands, SentinelCommands {
........
}

Jedis继承了父类BinaryJedis，那么再来看看BinaryJedis源码：

public class BinaryJedis implements BasicCommands, BinaryJedisCommands, MultiKeyBinaryCommands,AdvancedBinaryJedisCommands, BinaryScriptingCommands, Closeable {protected Client client = null;protected Transaction transaction = null;protected Pipeline pipeline = null;......}

查看BinaryJedis源码，不难发现，所有与redis操作都与Client类有关。我们就再来看看Client这个类吧。

public class Client extends BinaryClient implements Commands {public Client() {super();}public Client(final String host) {super(host);}
.......
}

继续查看BinaryClient类

public class BinaryClient extends Connection {public enum LIST_POSITION {BEFORE, AFTER;public final byte[] raw;private LIST_POSITION() {raw = SafeEncoder.encode(name());}}private boolean isInMulti;private String password;private long db;private boolean isInWatch;public BinaryClient() {super();}public BinaryClient(final String host) {super(host);}
..........
}

还有父类，继续查看父类Connection

public class Connection implements Closeable {private static final byte[][] EMPTY_ARGS = new byte[0][];private String host = Protocol.DEFAULT_HOST;private int port = Protocol.DEFAULT_PORT;private Socket socket;private RedisOutputStream outputStream;private RedisInputStream inputStream;private int pipelinedCommands = 0;private int connectionTimeout = Protocol.DEFAULT_TIMEOUT;private int soTimeout = Protocol.DEFAULT_TIMEOUT;private boolean broken = false;private boolean ssl;private SSLSocketFactory sslSocketFactory;private SSLParameters sslParameters;private HostnameVerifier hostnameVerifier;public Connection() {}public Connection(final String host) {this.host = host;}public Connection(final String host, final int port) {this.host = host;this.port = port;}public Connection(final String host, final int port, final boolean ssl) {this.host = host;this.port = port;this.ssl = ssl;}.........
}

吼吼，看到这里就不难发现，jedis作为redis的客户端链接服务器是通过socket来完成的。

而Redis采用的是基于内存的采用的是单进程单线程模型的KV数据库。所以作为多线程的客户端，jedis使用后要主动做归还动作。否则。。。你明白的！占用socket资源咯