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使用Spring + Jedis集成Redis

来源:  2016-09-09 13:15:37    评论:0点击:

使用Spring和Jedis完成分片Redis的集成

一、集成环境

Tomcat7

JDK1.7

Jedis-2.7.2

Spring-4.1.6

二、资源依赖

(省略,网上很多)

三、集成过程

1、配置资源池

     这里使用Jedis的ShardedJedisPool来管理,我们定义该配置文件为:spring-redis.xml,全部内容如下:

<?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:p="http://www.springframework.org/schema/p"
  xmlns:context="http://www.springframework.org/schema/context"
  xmlns:aop="http://www.springframework.org/schema/aop"
  xmlns:tx="http://www.springframework.org/schema/tx"
  xmlns:util="http://www.springframework.org/schema/util"
  xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-3.2.xsd
    http://www.springframework.org/schema/tx
    http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
    http://www.springframework.org/schema/aop
    http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
    http://www.springframework.org/schema/util
    http://www.springframework.org/schema/util/spring-util-3.2.xsd">
 
  <!-- 引入jedis配置文件 -->
    <context:property-placeholder location="classpath:conf/properties/redis.properties"
    ignore-unresolvable="true" />
   
    <bean id="jedisPoolConfig" class="redis.clients.jedis.JedisPoolConfig">
        <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>


几个注意的点:

(1)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"

(2)注意新版的(具体从哪个版本开始不清楚,有兴趣可以查一下)JedisPoolConfig的property name,不是maxActive而是maxTotal,而且没有maxWait属性,建议看一下Jedis源码。

(3)ShardedJedisPool有多种构造函数,选择你需要的(具体看源码),示例中只初始化了一个分片,并使用了通过指定host的构造器(具体格式见下文),如果有集群,在<list>下增加新的<bean>即可。


2、准备redis.properties,内容如下:

redis.pool.maxActive=200
redis.pool.maxIdle=50
redis.pool.minIdle=10
redis.pool.maxWaitMillis=20000
redis.pool.maxWait=300
redis.uri = redis://password@127.0.0.1:6379/0
redis.timeout=30000


这里要注意redis.uri的格式:redis://[密码]@[服务器地址]:[端口]/[db index]

建议大家使用这种方式,配置内容少,还能自定义db index,非常适合开发、测试和线上环境的切换


3、将spring-redis.xml加入web.xml的context中,如下:

 <context-param>
   
<param-name>contextConfigLocation</param-name>

    <param-value>classpath:conf/spring-redis.xml</param-value>

  </context-param>

如果你有多个数据源通过spring管理(如mysql),则同时加载,如下:

 <context-param>
   
<param-name>contextConfigLocation</param-name>
   
<param-value>classpath:conf/spring-mybatis.xml,classpath:conf/spring-redis.xml</param-value>

  </context-param>


3、以上所有的配置已完成,接下来的代码的实现

     (1)推荐大家使用统一的类来管理Jedis实例的生成和回收,参考代码如下:JedisDataSourceImpl.class

@Repository("jedisDS")
public class JedisDataSourceImpl implements JedisDataSource {
    private static final Logger LOG = LoggerFactory.getLogger(JedisDataSourceImpl.class);
    
    @Autowired
    private ShardedJedisPool shardedJedisPool;
    
    @Override
    public ShardedJedis getRedisClient() {
        ShardedJedis shardJedis = null;
        try {
            shardJedis = shardedJedisPool.getResource();
            return shardJedis;
        } catch (Exception e) {
            LOG.error("[JedisDS] getRedisClent error:" + e.getMessage());
            if (null != shardJedis)
                shardJedis.close();
        }
        return null;
    }

    @Override
    public void returnResource(ShardedJedis shardedJedis) {
        shardedJedis.close();
    }

    @Override
    public void returnResource(ShardedJedis shardedJedis, boolean broken) {
        shardedJedis.close();
    }

}


这里要注意的是Jedis实例的回收,从jedis2.6开始,原returnResource方式已经提示在后续版本中不再支持,所以不建议大家再用ShardedJedisPool里的returnResource和retureBrokenResource方法,虽然在2.7中还支持(毕竟是因为这两个方法存在漏洞)。

     (2)编写具体的Jedis操作类(片断):RedisClientTemplate.class

@Repository("redisClientTemplate")
public class RedisClientTemplate {
    private static final Logger log = LoggerFactory.getLogger(RedisClientTemplate.class);

    @Autowired
    private JedisDataSource redisDataSource;

    public void disconnect() {
        ShardedJedis shardedJedis = redisDataSource.getRedisClient();
        shardedJedis.disconnect();
    }

    /**
     * 设置单个值
     * 
     * @param key
     * @param value
     * @return
     */
    public String set(String key, String value) {
        String result = null;

        ShardedJedis shardedJedis = redisDataSource.getRedisClient();
        if (shardedJedis == null) {
            return result;
        }
        boolean broken = false;
        try {
            result = shardedJedis.set(key, value);
        } catch (Exception e) {
            log.error(e.getMessage(), e);
            broken = true;
        } finally {
            redisDataSource.returnResource(shardedJedis, broken);
        }
        return result;
    }

    /**
     * 获取单个值
     * 
     * @param key
     * @return
     */
    public String get(String key) {
        String result = null;
        ShardedJedis shardedJedis = redisDataSource.getRedisClient();
        if (shardedJedis == null) {
            return result;
        }

        boolean broken = false;
        try {
            result = shardedJedis.get(key);

        } catch (Exception e) {
            log.error(e.getMessage(), e);
            broken = true;
        } finally {
            redisDataSource.returnResource(shardedJedis, broken);
        }
        return result;
    }

    public Boolean exists(String key) {
        Boolean result = false;
        ShardedJedis shardedJedis = redisDataSource.getRedisClient();
        if (shardedJedis == null) {
            return result;
        }
        boolean broken = false;
        try {
            result = shardedJedis.exists(key);
        } catch (Exception e) {
            log.error(e.getMessage(), e);
            broken = true;
        } finally {
            redisDataSource.returnResource(shardedJedis, broken);
        }
        return result;
    }

    public String type(String key) {
        String result = null;
        ShardedJedis shardedJedis = redisDataSource.getRedisClient();
        if (shardedJedis == null) {
            return result;
        }
        boolean broken = false;
        try {
            result = shardedJedis.type(key);

        } catch (Exception e) {
            log.error(e.getMessage(), e);
            broken = true;
        } finally {
            redisDataSource.returnResource(shardedJedis, broken);
        }
        return result;
    }

    /**
     * 在某段时间后失效
     * 
     * @param key
     * @param seconds
     * @return
     */
    public Long expire(String key, int seconds) {
        Long result = null;
        ShardedJedis shardedJedis = redisDataSource.getRedisClient();
        if (shardedJedis == null) {
            return result;
        }
        boolean broken = false;
        try {
            result = shardedJedis.expire(key, seconds);

        } catch (Exception e) {
            log.error(e.getMessage(), e);
            broken = true;
        } finally {
            redisDataSource.returnResource(shardedJedis, broken);
        }
        return result;
    }

    /**
     * 在某个时间点失效
     * 
     * @param key
     * @param unixTime
     * @return
     */
    public Long expireAt(String key, long unixTime) {
        Long result = null;
        ShardedJedis shardedJedis = redisDataSource.getRedisClient();
        if (shardedJedis == null) {
            return result;
        }
        boolean broken = false;
        try {
            result = shardedJedis.expireAt(key, unixTime);

        } catch (Exception e) {
            log.error(e.getMessage(), e);
            broken = true;
        } finally {
            redisDataSource.returnResource(shardedJedis, broken);
        }
        return result;
    }

    public Long ttl(String key) {
        Long result = null;
        ShardedJedis shardedJedis = redisDataSource.getRedisClient();
        if (shardedJedis == null) {
            return result;
        }
        boolean broken = false;
        try {
            result = shardedJedis.ttl(key);

        } catch (Exception e) {
            log.error(e.getMessage(), e);
            broken = true;
        } finally {
            redisDataSource.returnResource(shardedJedis, broken);
        }
        return result;
    }

    public boolean setbit(String key, long offset, boolean value) {

        ShardedJedis shardedJedis = redisDataSource.getRedisClient();
        boolean result = false;
        if (shardedJedis == null) {
            return result;
        }
        boolean broken = false;
        try {
            result = shardedJedis.setbit(key, offset, value);
        } catch (Exception e) {
            log.error(e.getMessage(), e);
            broken = true;
        } finally {
            redisDataSource.returnResource(shardedJedis, broken);
        }
        return result;
    }

    public boolean getbit(String key, long offset) {
        ShardedJedis shardedJedis = redisDataSource.getRedisClient();
        boolean result = false;
        if (shardedJedis == null) {
            return result;
        }
        boolean broken = false;

        try {
            result = shardedJedis.getbit(key, offset);
        } catch (Exception e) {
            log.error(e.getMessage(), e);
            broken = true;
        } finally {
            redisDataSource.returnResource(shardedJedis, broken);
        }
        return result;
    }

    public long setRange(String key, long offset, String value) {
        ShardedJedis shardedJedis = redisDataSource.getRedisClient();
        long result = 0;
        if (shardedJedis == null) {
            return result;
        }
        boolean broken = false;
        try {
            result = shardedJedis.setrange(key, offset, value);
        } catch (Exception e) {
            log.error(e.getMessage(), e);
            broken = true;
        } finally {
            redisDataSource.returnResource(shardedJedis, broken);
        }
        return result;
    }

    public String getRange(String key, long startOffset, long endOffset) {
        ShardedJedis shardedJedis = redisDataSource.getRedisClient();
        String result = null;
        if (shardedJedis == null) {
            return result;
        }
        boolean broken = false;
        try {
            result = shardedJedis.getrange(key, startOffset, endOffset);

        } catch (Exception e) {
            log.error(e.getMessage(), e);
            broken = true;
        } finally {
            redisDataSource.returnResource(shardedJedis, broken);
        }
        return result;
    }
}


     (3)好了,接下来在你的业务代码里加载RedisClientTemplate.class就可以了。

来自:http://my.oschina.net/u/866380/blog/521658

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