集群环境下redis的Java客户端jedis池的介绍及使用（二）

jedis是redis的java客户端，spring将redis连接池作为一个bean配置。
redis连接池分为两种，一种是“redis.clients.jedis.ShardedJedisPool”，这是基于hash算法的一种分布式集群redis客户端连接池。
另一种是“redis.clients.jedis.JedisPool”，这是单机环境适用的redis连接池。

maven导入相关包：

    <!-- redis依赖包 -->
    <dependency>
      <groupId>redis.clients</groupId>
      <artifactId>jedis</artifactId>
      <version>2.9.0</version>
    </dependency>

ShardedJedisPool是redis集群客户端的对象池，可以通过他来操作ShardedJedis，下面是ShardedJedisPool的xml配置，spring-jedis.xml：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

    <!-- 引入jedis的properties配置文件 -->
    <!--如果你有多个数据源需要通过<context:property-placeholder管理，且不愿意放在一个配置文件里，那么一定要加上ignore-unresolvable=“true"-->
    <context:property-placeholder location="classpath:properties/redis.properties" ignore-unresolvable="true" />

    <!--shardedJedisPool的相关配置-->
    <bean id="jedisPoolConfig" class="redis.clients.jedis.JedisPoolConfig">
        <!--新版是maxTotal，旧版是maxActive-->
        <property name="maxTotal">
            <value>${redis.pool.maxActive}</value>
        </property>
        <property name="maxIdle">
            <value>${redis.pool.maxIdle}</value>
        </property>
        <property name="testOnBorrow" value="true"/>
        <property name="testOnReturn" value="true"/>
    </bean>

    <bean id="shardedJedisPool" class="redis.clients.jedis.ShardedJedisPool"  scope="singleton">
        <constructor-arg index="0" ref="jedisPoolConfig" />
        <constructor-arg index="1">
            <list>
                <bean class="redis.clients.jedis.JedisShardInfo">
                    <constructor-arg name="host" value="${redis.uri}" />
                </bean>
            </list>
        </constructor-arg>
    </bean>
</beans>

下面是单机环境下redis连接池的配置：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

    <!-- 引入jedis的properties配置文件 -->
    <!--如果你有多个数据源需要通过<context:property-placeholder管理，且不愿意放在一个配置文件里，那么一定要加上ignore-unresolvable=“true"-->
    <context:property-placeholder location="classpath:properties/redis.properties" ignore-unresolvable="true" />

    <!--Jedis连接池的相关配置-->
    <bean id="jedisPoolConfig" class="redis.clients.jedis.JedisPoolConfig">
        <!--新版是maxTotal，旧版是maxActive-->
        <property name="maxTotal">
            <value>${redis.pool.maxActive}</value>
        </property>
        <property name="maxIdle">
            <value>${redis.pool.maxIdle}</value>
        </property>
        <property name="testOnBorrow" value="true"/>
        <property name="testOnReturn" value="true"/>
    </bean>

    <bean id="jedisPool" class="redis.clients.jedis.JedisPool">
        <constructor-arg name="poolConfig" ref="jedisPoolConfig" />
        <constructor-arg name="host" value="${redis.host}" />
        <constructor-arg name="port" value="${redis.port}" type="int" />
        <constructor-arg name="timeout" value="${redis.timeout}" type="int" />
        <constructor-arg name="password" value="${redis.password}" />
        <constructor-arg name="database" value="${redis.database}" type="int" />
    </bean>
</beans>

对应的classpath:properties/redis.properties.xml为：

#最大分配的对象数
redis.pool.maxActive=200
#最大能够保持idel状态的对象数
redis.pool.maxIdle=50
redis.pool.minIdle=10
redis.pool.maxWaitMillis=20000
#当池内没有返回对象时，最大等待时间
redis.pool.maxWait=300

#格式：redis://:[密码]@[服务器地址]:[端口]/[db index]
redis.uri = redis://:[email protected]:6379/0

redis.host = 127.0.0.1
redis.port = 6379
redis.timeout=30000
redis.password = 12345
redis.database = 0

二者操作代码类似，都是先注入连接池，然后通过连接池获得jedis实例，通过实例对象操作redis。

ShardedJedis操作：

    @Autowired
    private ShardedJedisPool shardedJedisPool;//注入ShardedJedisPool

    @RequestMapping(value = "/demo_set",method = RequestMethod.GET)
    @ResponseBody
    public String demo_set(){
        //获取ShardedJedis对象
        ShardedJedis shardJedis = shardedJedisPool.getResource();
        //存入键值对
        shardJedis.set("key1","hello jedis");
        //回收ShardedJedis实例
        shardJedis.close();

        return "set";
    }

    @RequestMapping(value = "/demo_get",method = RequestMethod.GET)
    @ResponseBody
    public String demo_get(){
        ShardedJedis shardedJedis = shardedJedisPool.getResource();
        //根据键值获得数据
        String result = shardedJedis.get("key1");
        shardedJedis.close();

        return result;
    }

Jedis操作：

    @Autowired
    private JedisPool jedisPool;//注入JedisPool

    @RequestMapping(value = "/demo_set",method = RequestMethod.GET)
    @ResponseBody
    public String demo_set(){
        //获取ShardedJedis对象
        Jedis jedis = jedisPool.getResource();
        //存入键值对
        jedis.set("key2","hello jedis one");
        //回收ShardedJedis实例
        jedis.close();

        return "set";
    }

    @RequestMapping(value = "/demo_get",method = RequestMethod.GET)
    @ResponseBody
    public String demo_get(){
        Jedis jedis = jedisPool.getResource();
        //根据键值获得数据
        String result = jedis.get("key2");
        jedis.close();

        return result;
    }

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