深入浅出Redis-Spring整合Redis
概述：
在之前的博客中，有提到过Redis 在服务端的一些相关知识，今天主要讲一下Java 整合Redis的相关内容。
下面是Jedis 的相关依赖：
redis.clients jedis 2.5.1 org.springframework.data spring-data-redis 1.0.2.RELEASE
1、Jedis 单机客户端
首先我们了解一下，使用Jedis 连接我们的Redis 服务器：
public static void main(String[] args) {
String host = "127.0.0.1";
int port = 6379;
Jedis jedis = new Jedis(host,port,50000);
jedis.set("name","jayce");
String name = jedis.get("name"); System.out.println(name); jedis.close(); }
我们先来看直观的运行结果：
1.1 Jedis 构造函数：
我们先从Jedis 的构造函数开始说起，在Jedis的源码中，我们可以看到Jedis 提供以下几种构造函数：
从上图中我们可以看到一个很重要的信息，Jedis 继承BinaryJedis，并且它的所有构造函数都采用了父类的构造函数：
//根据host 默认端口6379获取连接
public Jedis(final String host) {
super(host);
}
//根据host 与特定端口获取连接
public Jedis(final String host, final int port) {
super(host, port);
}
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//根据host 与特定端口获取连接，并且设定key的生命周期
public Jedis(final String host, final int port, final int timeout) {
super(host, port, timeout); } //根据JedisShardInfo 配置信息，获取连接 public Jedis(JedisShardInfo shardInfo) { super(shardInfo); } //根据特定URI 获取连接 public Jedis(URI uri) { super(uri); }
我们可以观察到父类BinaryJedis 的构造函数中，最终的目的是为了创建一个client，而这个client实质上是一个connection：
因此，我们在创建一个Jedis 对象的过程中，创建了一个对服务器进行连接的Client，而接下来的相关操作，也是由这个client 进行操作。
1.2 Jedis 的Get和Set：
在调用Get和Set方法之前，我们需要创建一个连接，然后进行相应的操作，下述代码提供了设置字符串，和设置对象到Redis 中，需要注意的是，我们在将对象放到Redis 之前，需要将对象进行序列化，因此对象需要实现Serializable接口：
public static void main(String[] args) {
String host = "127.0.0.1";
int port = 6381;
Jedis jedis = new Jedis(host, port);
setString(jedis);
setObject(jedis);
jedis.close();
}
private static void setString(Jedis jedis) {
jedis.set("name", "jayce"); String name = jedis.get("name"); System.out.println(name); } private static void setObject(Jedis jedis) { User user = new User(); user.setId(1); user.setName("jayce"); user.setPassword("kong"); byte[] values = SerializeUtil.serialize(user); byte[] names = "user".getBytes(); jedis.set(names, values); byte[] bytes = jedis.get("user".getBytes()); User userCache = (User) SerializeUtil.unserialize(bytes); System.out.println(userCache); }
我们在服务器中的Redis 中可以看到：
数据已经缓存到了Redis 中。
然后，我们再跟踪一下，Jedis 是如何将一个对象存到了服务器中的：
第一步：Jedis 调用 set 方法，然后调用内部的client进行操作：
public String set(final String key, String value) {
checkIsInMulti();
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client.set(key, value); return
client.getStatusCodeReply(); }
第二步：client 调用 SafeEncoder.encode(key) 方法，将字符串转换成二进制数组，再调用client 中的 set（byte[],byte[]）方法：
public void set(final String key, final String value) {
set(SafeEncoder.encode(key), SafeEncoder.encode(value));
}
public void set(final byte[] key, final byte[] value) {
sendCommand(Command.SET, key, value);
}
第三步：在调用父类Connection中的 sendCommand（） 方法，最终将内容传到服务器中：
protected Connection sendCommand(final Command cmd, final byte[]... args) {
try {
connect();
Protocol.sendCommand(outputStream, cmd, args);
pipelinedCommands++;
return this;
} catch (JedisConnectionException ex) {
// Any other exceptions related to connection?
broken = true; throw ex; } }
2、Jedis 单机版整合Spring
在Spring官网中，给出了这样得一个Demo：
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这个配置文件比较直接的帮我们配置了 jedisConectionFactory ，我们需要做的是注入这个Bean 之后，在工厂里面获取到Connection，然后进行相应的操作。
根据常用的场景，我们用到的比较多的是 Pool
接下来我们研究一下，JedisPool 的源码，方便我们对配置文件的理解：
public JedisPool(GenericObjectPoolConfig poolConfig, String host) {
this(poolConfig, host, 6379, 2000, (String)null, 0, (String)null);
}
public JedisPool(String host, int port) {
this(new GenericObjectPoolConfig(), host, port, 2000, (String)null, 0, (String)null);
}
public JedisPool(String host) {
URI uri = URI.create(host); if(uri.getScheme() != null && uri.getScheme().equals("redis")) { String h = uri.getHost(); int port = uri.getPort(); String password = uri.getUserInfo().split(":", 2)[1]; int database = Integer.parseInt(uri.getPath().split("/", 2)[1]); this.internalPool = new GenericObjectPool(new JedisFactory(h, port, 2000, password, database, (String)null), new GenericObjectPoolConfig()); } else { this.internalPool = new GenericObjectPool(new JedisFactory(host, 6379, 2000, (String)null, 0, (String)null), new GenericObjectPoolConfig()); } } public JedisPool(URI uri) { String h = uri.getHost(); int port = uri.getPort(); String password = uri.getUserInfo().split(":", 2)[1]; int database = Integer.parseInt(uri.getPath().split("/", 2)[1]); this.internalPool = new GenericObjectPool(new JedisFactory(h, port, 2000, password, database, (String)null), new GenericObjectPoolConfig()); } public JedisPool(GenericObjectPoolConfig poolConfig, String host, int port, int timeout, String password) { this(poolConfig, host, port, timeout, password, 0, (String)null); } public JedisPool(GenericObjectPoolConfig poolConfig, String host, int port) { this(poolConfig, host, port, 2000, (String)null, 0, (String)null); } public JedisPool(GenericObjectPoolConfig poolConfig, String host, int port, int timeout) { this(poolConfig, host, port, timeout, (String)null, 0, (String)null); } public JedisPool(GenericObjectPoolConfig poolConfig, String host, int port, int timeout, String password, int database) { this(poolConfig, host, port, timeout, password, database, (String)null); }
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JedisPool 的构造函数与上述的Jedis 的构造函数很相似，这里比较特别的是 GenericObjectPoolConfig 这个配置类，这个类 是org.apache.commons.pool2 包下面的一个用来设置池的大小的类
我们在配置application.xml文件的时候，可以自己配置对应的池大小，但是如果没有相应的配置文件的同学，推荐还是使用默认配置。
public static void main(String[] args) {
ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext-Redis.xml");
Pool jedisPool = (Pool)applicationContext.getBean("redisClient");
Jedis jedis = jedisPool.getResource();
setString(jedis);
setObject(jedis);
jedisPool.returnResource(jedis);
}
private static void setString(Jedis jedis) {
jedis.set("name", "jayce"); String name = jedis.get("name"); System.out.println(name); } private static void setObject(Jedis jedis) { User user = new User(); user.setId(1); user.setName("jayce"); user.setPassword("kong"); byte[] values = SerializeUtil.serialize(user); byte[] names = "user".getBytes(); jedis.set(names, values); byte[] bytes = jedis.get("user".getBytes()); User userCache = (User) SerializeUtil.unserialize(bytes); System.out.println(userCache); }
运行结果：
jayce
User{id=1, name='jayce', password='kong'}