1、基本信息
先来看看他们的类定义：
public class Jedis extends BinaryJedis implements
JedisCommands, MultiKeyCommands,
AdvancedJedisCommands, ScriptingCommands, BasicCommands, ClusterCommands, SentinelCommands {
……
}
public class BinaryJedis implements
BasicCommands, BinaryJedisCommands, MultiKeyBinaryCommands,
AdvancedBinaryJedisCommands, BinaryScriptingCommands, Closeable {
……
}
Jedis继承自BinaryJedis，二者都实现了一系列的命令接口。
仔细看就能发现，这些接口几乎是一一对应的：例如MultiKeyBinaryCommands和MultiKeyCommands，BinaryScriptingCommands和ScriptingCommands等等。从名字就可以看出来他们之间的区别就是是否是binary（二进制）的，从他们的各自的方法中可以找到依据。
public interface MultiKeyBinaryCommands {
Long del(byte[]... keys);
List<byte[]> blpop(int timeout, byte[]... keys);
List<byte[]> brpop(int timeout, byte[]... keys);
List<byte[]> blpop(byte[]... args);
List<byte[]> brpop(byte[]... args);
Set<byte[]> keys(byte[] pattern);
……
}
public interface MultiKeyCommands {
Long del(String... keys);
List<String> blpop(int timeout, String... keys);
List<String> brpop(int timeout, String... keys);
List<String> blpop(String... args);
List<String> brpop(String... args);
Set<String> keys(String pattern);
……
}这些接口命令中，只有BasicCommands是相同的，不存在是不是二进制相关的方法。因为该类中主要是redis的其他操作，并不涉及具体数据类型的操作。简单看几个方法就知道了。
public interface BasicCommands {
String ping();
String quit();
String flushDB();
Long dbSize();
String select(int index);
String flushAll();
String auth(String password);
……
}2、结构关系
前面介绍完了两个类之间的关系和实现的接口，虽然我们平常使用以jedis居多，但其实精华都在binaryJedis中。
//真正的客户端
protected Client client = null;
//用来区分是否是事务操作
protected Transaction transaction = null;
protected Pipeline pipeline = null;
//下面列举了几种比较典型的构造方法
public BinaryJedis() {
client = new Client();
}
public BinaryJedis(final String host) {
URI uri = URI.create(host);
if (uri.getScheme() != null && uri.getScheme().equals("redis")) {
initializeClientFromURI(uri);
} else {
client = new Client(host);
}
}
public BinaryJedis(final String host, final int port, final int connectionTimeout,
final int soTimeout) {
client = new Client(host, port);
client.setConnectionTimeout(connectionTimeout);
client.setSoTimeout(soTimeout);
}
public BinaryJedis(final JedisShardInfo shardInfo) {
client = new Client(shardInfo.getHost(), shardInfo.getPort());
client.setConnectionTimeout(shardInfo.getConnectionTimeout());
client.setSoTimeout(shardInfo.getSoTimeout());
client.setPassword(shardInfo.getPassword());
client.setDb(shardInfo.getDb());
}
public BinaryJedis(final URI uri, final int timeout) {
initializeClientFromURI(uri);
client.setConnectionTimeout(timeout);
client.setSoTimeout(timeout);
}
构造函数中的操作，基本上都是创建Client，并初始化数据信息。那么这个Client是个什么呢？
public class Client extends BinaryClient implements Commands {}
public class BinaryClient extends Connection {}Connection类中主要是socket进行通信，一个Connection已经就是一个最基础的客户端。
另外增加各种协议层次的发送命令和收取结果的方法，都是通过Protocol类的操作RedisOutputStream和RedisInputStream完成的。封装了输入输出流，来方便使用。
public class Connection implements Closeable {
private String host = Protocol.DEFAULT_HOST;
private int port = Protocol.DEFAULT_PORT;
private Socket socket;
private RedisOutputStream outputStream;
private RedisInputStream inputStream;
……
}主要方法：
1、connect()
public void connect() {
if (!isConnected()) {
try {
//创建socket，设置相关参数
socket = new Socket();
socket.setReuseAddress(true);
socket.setKeepAlive(true); // Will monitor the TCP connection is
// valid
socket.setTcpNoDelay(true); // Socket buffer Whetherclosed, to
// ensure timely delivery of data
socket.setSoLinger(true, 0); // Control calls close () method,
// 连接
socket.connect(new InetSocketAddress(host, port), connectionTimeout);
socket.setSoTimeout(soTimeout);
//输入输出
outputStream = new RedisOutputStream(socket.getOutputStream());
inputStream = new RedisInputStream(socket.getInputStream());
} catch (IOException ex) {
broken = true;
throw new JedisConnectionException(ex);
}
}
}
2、disconnect()
public void disconnect() {
if (isConnected()) {
try {
outputStream.flush();
socket.close();
} catch (IOException ex) {
broken = true;
throw new JedisConnectionException(ex);
} finally {
IOUtils.closeQuietly(socket);
}
}
}3、isConnected()
public boolean isConnected() {
return socket != null && socket.isBound() && !socket.isClosed() && socket.isConnected()
&& !socket.isInputShutdown() && !socket.isOutputShutdown();
}