Redis客户端之Spring整合Jedis,ShardedJedisPool集群配置

Jedis设计

Jedis作为推荐的java语言redis客户端，其抽象封装为三部分：

 

  1. 对象池设计：Pool，JedisPool，GenericObjectPool，BasePoolableObjectFactory，JedisFactory
  2. 面向用户的redis操作封装：BinaryJedisCommands，JedisCommands，BinaryJedis，Jedis
  3. 面向redis服务器的操作封装：Commands，Client，BinaryClient，Connection，Protocol

 

其类设计图如下：

 


 

关于common-pool的相关内容，可以参见：http://macrochen.iteye.com/blog/320077

 

其他类的设计作用如下：

 

 

类名 职责
Pool 抽象Jedis对象池操作；并委托给操作给GenericObjectPool
JedisPool 实现Pool并提供JedisFactory工厂
JedisFactory 实现BasePoolableObjectFactory，提供创建，销毁Jedis方法
BinaryJedisCommands 抽象面向客户端操作的Redis命令；key，value都为序列化后的byte数组
JedisCommands 抽象面向客户端操作的Redis命令；提供String类型的key，value
BinaryJedis 实现BinaryJedisCommands接口，并将实际操作委托给Client
Jedis 实现JedisCommands接口，并将操作委托给Client
Commands 抽象Redis操作接口，提供String类型的key，value操作；被Jedis调用
Connection 抽象了Redis连接；包括host，port，pass，socket，inputstream,outputstream,protocol 完成与Redis服务器的通信
Protocol 抽象了Redis协议处理
BinaryClient 继承Connection类，封装了基于Byte[]的key，value操作
Client 继承BinaryClient同时实现了Commands，对上层提供基于String类型的操作

 

 

ShardedJedis实现分析

ShardedJedis是基于一致性哈希算法实现的分布式Redis集群客户端；ShardedJedis的设计分为以下几块：

 

  1. 对象池设计：Pool，ShardedJedisPool，ShardedJedisFactory
  2. 面向用户的操作封装：BinaryShardedJedis，BinaryShardedJedis
  3. 一致性哈希实现：Sharded

关于ShardedJedis设计，忽略了Jedis的设计细节，设计类图如下：

 



关于ShardedJedis类图设计，省略了对象池，以及Jedis设计的以下细节介绍： 

类名 职责
Sharded

抽象了基于一致性哈希算法的划分设计，设计思路

 

  1. 基于hash算法划分redis服务器
  2. 保持每台Redis服务器的Jedis客户端
  3. 提供基于Key的划分方法；提供了ShardKeyTag实现
BinaryShardedJedis 同BinaryJedis类似，实现BinaryJedisCommands对外提供基于Byte[]的key，value操作
ShardedJedis 同Jedis类似，实现JedisCommands对外提供基于String的key，value操作

 

 

Sharded一致性哈希实现

shared一致性哈希采用以下方案：

 

 

  1. Redis服务器节点划分：将每台服务器节点采用hash算法划分为160个虚拟节点(可以配置划分权重)
  2. 将划分虚拟节点采用TreeMap存储
  3. 对每个Redis服务器的物理连接采用LinkedHashMap存储
  4. 对Key or KeyTag 采用同样的hash算法，然后从TreeMap获取大于等于键hash值得节点，取最邻近节点存储；当key的hash值大于虚拟节点hash值得最大值时，存入第一个虚拟节点
sharded采用的hash算法：MD5 和 MurmurHash两种；默认采用64位的MurmurHash算法；有兴趣的可以研究下，MurmurHash是一种高效，低碰撞的hash算法；参考地址：
 
spring集成配置例子
<?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-3.2.xsd
        http://www.springframework.org/schema/context  http://www.springframework.org/schema/context/spring-context-3.2.xsd"
    default-lazy-init="true">

    <description>Jedis Configuration</description>

    <!-- 加载配置属性文件 -->
    <context:property-placeholder
        ignore-unresolvable="true" location="classpath:jeesite.properties" />

    <bean id="jedisPoolConfig" class="redis.clients.jedis.JedisPoolConfig">
        <property name="maxIdle" value="300" /> <!-- 最大能够保持idel状态的对象数 -->
        <property name="maxTotal" value="60000" /> <!-- 最大分配的对象数 -->
        <property name="testOnBorrow" value="true" /> <!-- 当调用borrow Object方法时，是否进行有效性检查 -->
    </bean>

    <bean id="jedisPool" class="redis.clients.jedis.JedisPool">
        <constructor-arg index="0" ref="jedisPoolConfig" />
        <constructor-arg index="1" value="${redis.host}" />
        <constructor-arg index="2" value="${redis.port}" type="int" />
    </bean>
    
    <!-- jedis集群部署 -->
    <bean id="shardedJedisPool" class="redis.clients.jedis.ShardedJedisPool" destroy-method="destroy">
        <constructor-arg ref="jedisPoolConfig" />
        <constructor-arg>
            <list>
                <bean class="redis.clients.jedis.JedisShardInfo">
                    <constructor-arg value="127.0.0.1" />
                    <constructor-arg type="int" value="7000" />
                    <constructor-arg value="instance:01" />
                </bean>
                <bean class="redis.clients.jedis.JedisShardInfo">
                    <constructor-arg value="127.0.0.1" />
                    <constructor-arg type="int" value="7001" />
                    <constructor-arg value="instance:02" />
                </bean>
                <bean class="redis.clients.jedis.JedisShardInfo">
                    <constructor-arg value="127.0.0.1" />
                    <constructor-arg type="int" value="7003" />
                    <constructor-arg value="instance:03" />
                </bean>
            </list>
        </constructor-arg>
    </bean>

</beans>

自己封装的SharedJedis操作客户端工具类：

import java.util.List;
import java.util.Map;
import java.util.Set;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import com.google.common.collect.Sets;
import com.thinkgem.jeesite.common.config.Global;

import redis.clients.jedis.ShardedJedis;
import redis.clients.jedis.ShardedJedisPool;
import redis.clients.jedis.exceptions.JedisException;

/**
 * ShardedJedis Cache 工具类
 * redis集群部署时的工具类
 * 
 */
public class SharedJedisUtils {

    private static Logger logger = LoggerFactory.getLogger(SharedJedisUtils.class);
    
    private static ShardedJedisPool shardedJedisPool = SpringContextHolder.getBean(ShardedJedisPool.class);

    public static final String KEY_PREFIX = Global.getConfig("redis.keyPrefix");
    
    /**
     * 获取缓存
     * @param key 键
     * @return 值
     */
    public static String get(String key) {
        String value = null;
        ShardedJedis ShardedJedis = null;
        try {
            ShardedJedis = getResource();
            if (ShardedJedis.exists(key)) {
                value = ShardedJedis.get(key);
                value = StringUtils.isNotBlank(value) && !"nil".equalsIgnoreCase(value) ? value : null;
                logger.debug("get {} = {}", key, value);
            }
        } catch (Exception e) {
            logger.warn("get {} = {}", key, value, e);
        } finally {
            returnResource(ShardedJedis);
        }
        return value;
    }
    
    /**
     * 获取缓存
     * @param key 键
     * @return 值
     */
    public static Object getObject(String key) {
        Object value = null;
        ShardedJedis ShardedJedis = null;
        try {
            ShardedJedis = getResource();
            if (ShardedJedis.exists(getBytesKey(key))) {
                value = toObject(ShardedJedis.get(getBytesKey(key)));
                logger.debug("getObject {} = {}", key, value);
            }
        } catch (Exception e) {
            logger.warn("getObject {} = {}", key, value, e);
        } finally {
            returnResource(ShardedJedis);
        }
        return value;
    }
    
    /**
     * 设置缓存
     * @param key 键
     * @param value 值
     * @param cacheSeconds 超时时间，0为不超时
     * @return
     */
    public static String set(String key, String value, int cacheSeconds) {
        String result = null;
        ShardedJedis ShardedJedis = null;
        try {
            ShardedJedis = getResource();
            result = ShardedJedis.set(key, value);
            if (cacheSeconds != 0) {
                ShardedJedis.expire(key, cacheSeconds);
            }
            logger.debug("set {} = {}", key, value);
        } catch (Exception e) {
            logger.warn("set {} = {}", key, value, e);
        } finally {
            returnResource(ShardedJedis);
        }
        return result;
    }
    
    /**
     * 设置缓存
     * @param key 键
     * @param value 值
     * @param cacheSeconds 超时时间，0为不超时
     * @return
     */
    public static String setObject(String key, Object value, int cacheSeconds) {
        String result = null;
        ShardedJedis ShardedJedis = null;
        try {
            ShardedJedis = getResource();
            result = ShardedJedis.set(getBytesKey(key), toBytes(value));
            if (cacheSeconds != 0) {
                ShardedJedis.expire(key, cacheSeconds);
            }
            logger.debug("setObject {} = {}", key, value);
        } catch (Exception e) {
            logger.warn("setObject {} = {}", key, value, e);
        } finally {
            returnResource(ShardedJedis);
        }
        return result;
    }
    
    /**
     * 获取List缓存
     * @param key 键
     * @return 值
     */
    public static List<String> getList(String key) {
        List<String> value = null;
        ShardedJedis ShardedJedis = null;
        try {
            ShardedJedis = getResource();
            if (ShardedJedis.exists(key)) {
                value = ShardedJedis.lrange(key, 0, -1);
                logger.debug("getList {} = {}", key, value);
            }
        } catch (Exception e) {
            logger.warn("getList {} = {}", key, value, e);
        } finally {
            returnResource(ShardedJedis);
        }
        return value;
    }
    
    /**
     * 获取List缓存
     * @param key 键
     * @return 值
     */
    public static List<Object> getObjectList(String key) {
        List<Object> value = null;
        ShardedJedis ShardedJedis = null;
        try {
            ShardedJedis = getResource();
            if (ShardedJedis.exists(getBytesKey(key))) {
                List<byte[]> list = ShardedJedis.lrange(getBytesKey(key), 0, -1);
                value = Lists.newArrayList();
                for (byte[] bs : list){
                    value.add(toObject(bs));
                }
                logger.debug("getObjectList {} = {}", key, value);
            }
        } catch (Exception e) {
            logger.warn("getObjectList {} = {}", key, value, e);
        } finally {
            returnResource(ShardedJedis);
        }
        return value;
    }
    
    /**
     * 设置List缓存
     * @param key 键
     * @param value 值
     * @param cacheSeconds 超时时间，0为不超时
     * @return
     */
    public static long setList(String key, List<String> value, int cacheSeconds) {
        long result = 0;
        ShardedJedis ShardedJedis = null;
        try {
            ShardedJedis = getResource();
            if (ShardedJedis.exists(key)) {
                ShardedJedis.del(key);
            }
            result = ShardedJedis.rpush(key, (String[])value.toArray());
            if (cacheSeconds != 0) {
                ShardedJedis.expire(key, cacheSeconds);
            }
            logger.debug("setList {} = {}", key, value);
        } catch (Exception e) {
            logger.warn("setList {} = {}", key, value, e);
        } finally {
            returnResource(ShardedJedis);
        }
        return result;
    }
    
    /**
     * 设置List缓存
     * @param key 键
     * @param value 值
     * @param cacheSeconds 超时时间，0为不超时
     * @return
     */
    public static long setObjectList(String key, List<Object> value, int cacheSeconds) {
        long result = 0;
        ShardedJedis ShardedJedis = null;
        try {
            ShardedJedis = getResource();
            if (ShardedJedis.exists(getBytesKey(key))) {
                ShardedJedis.del(key);
            }
            List<byte[]> list = Lists.newArrayList();
            for (Object o : value){
                list.add(toBytes(o));
            }
            result = ShardedJedis.rpush(getBytesKey(key), (byte[][])list.toArray());
            if (cacheSeconds != 0) {
                ShardedJedis.expire(key, cacheSeconds);
            }
            logger.debug("setObjectList {} = {}", key, value);
        } catch (Exception e) {
            logger.warn("setObjectList {} = {}", key, value, e);
        } finally {
            returnResource(ShardedJedis);
        }
        return result;
    }
    
    /**
     * 向List缓存中添加值
     * @param key 键
     * @param value 值
     * @return
     */
    public static long listAdd(String key, String... value) {
        long result = 0;
        ShardedJedis ShardedJedis = null;
        try {
            ShardedJedis = getResource();
            result = ShardedJedis.rpush(key, value);
            logger.debug("listAdd {} = {}", key, value);
        } catch (Exception e) {
            logger.warn("listAdd {} = {}", key, value, e);
        } finally {
            returnResource(ShardedJedis);
        }
        return result;
    }
    
    /**
     * 向List缓存中添加值
     * @param key 键
     * @param value 值
     * @return
     */
    public static long listObjectAdd(String key, Object... value) {
        long result = 0;
        ShardedJedis ShardedJedis = null;
        try {
            ShardedJedis = getResource();
            List<byte[]> list = Lists.newArrayList();
            for (Object o : value){
                list.add(toBytes(o));
            }
            result = ShardedJedis.rpush(getBytesKey(key), (byte[][])list.toArray());
            logger.debug("listObjectAdd {} = {}", key, value);
        } catch (Exception e) {
            logger.warn("listObjectAdd {} = {}", key, value, e);
        } finally {
            returnResource(ShardedJedis);
        }
        return result;
    }

    /**
     * 获取缓存
     * @param key 键
     * @return 值
     */
    public static Set<String> getSet(String key) {
        Set<String> value = null;
        ShardedJedis ShardedJedis = null;
        try {
            ShardedJedis = getResource();
            if (ShardedJedis.exists(key)) {
                value = ShardedJedis.smembers(key);
                logger.debug("getSet {} = {}", key, value);
            }
        } catch (Exception e) {
            logger.warn("getSet {} = {}", key, value, e);
        } finally {
            returnResource(ShardedJedis);
        }
        return value;
    }
    
    /**
     * 获取缓存
     * @param key 键
     * @return 值
     */
    public static Set<Object> getObjectSet(String key) {
        Set<Object> value = null;
        ShardedJedis ShardedJedis = null;
        try {
            ShardedJedis = getResource();
            if (ShardedJedis.exists(getBytesKey(key))) {
                value = Sets.newHashSet();
                Set<byte[]> set = ShardedJedis.smembers(getBytesKey(key));
                for (byte[] bs : set){
                    value.add(toObject(bs));
                }
                logger.debug("getObjectSet {} = {}", key, value);
            }
        } catch (Exception e) {
            logger.warn("getObjectSet {} = {}", key, value, e);
        } finally {
            returnResource(ShardedJedis);
        }
        return value;
    }
    
    /**
     * 设置Set缓存
     * @param key 键
     * @param value 值
     * @param cacheSeconds 超时时间，0为不超时
     * @return
     */
    public static long setSet(String key, Set<String> value, int cacheSeconds) {
        long result = 0;
        ShardedJedis ShardedJedis = null;
        try {
            ShardedJedis = getResource();
            if (ShardedJedis.exists(key)) {
                ShardedJedis.del(key);
            }
            result = ShardedJedis.sadd(key, (String[])value.toArray());
            if (cacheSeconds != 0) {
                ShardedJedis.expire(key, cacheSeconds);
            }
            logger.debug("setSet {} = {}", key, value);
        } catch (Exception e) {
            logger.warn("setSet {} = {}", key, value, e);
        } finally {
            returnResource(ShardedJedis);
        }
        return result;
    }
    
    /**
     * 设置Set缓存
     * @param key 键
     * @param value 值
     * @param cacheSeconds 超时时间，0为不超时
     * @return
     */
    public static long setObjectSet(String key, Set<Object> value, int cacheSeconds) {
        long result = 0;
        ShardedJedis ShardedJedis = null;
        try {
            ShardedJedis = getResource();
            if (ShardedJedis.exists(getBytesKey(key))) {
                ShardedJedis.del(key);
            }
            Set<byte[]> set = Sets.newHashSet();
            for (Object o : value){
                set.add(toBytes(o));
            }
            result = ShardedJedis.sadd(getBytesKey(key), (byte[][])set.toArray());
            if (cacheSeconds != 0) {
                ShardedJedis.expire(key, cacheSeconds);
            }
            logger.debug("setObjectSet {} = {}", key, value);
        } catch (Exception e) {
            logger.warn("setObjectSet {} = {}", key, value, e);
        } finally {
            returnResource(ShardedJedis);
        }
        return result;
    }
    
    /**
     * 向Set缓存中添加值
     * @param key 键
     * @param value 值
     * @return
     */
    public static long setSetAdd(String key, String... value) {
        long result = 0;
        ShardedJedis ShardedJedis = null;
        try {
            ShardedJedis = getResource();
            result = ShardedJedis.sadd(key, value);
            logger.debug("setSetAdd {} = {}", key, value);
        } catch (Exception e) {
            logger.warn("setSetAdd {} = {}", key, value, e);
        } finally {
            returnResource(ShardedJedis);
        }
        return result;
    }

    /**
     * 向Set缓存中添加值
     * @param key 键
     * @param value 值
     * @return
     */
    public static long setSetObjectAdd(String key, Object... value) {
        long result = 0;
        ShardedJedis ShardedJedis = null;
        try {
            ShardedJedis = getResource();
            Set<byte[]> set = Sets.newHashSet();
            for (Object o : value){
                set.add(toBytes(o));
            }
            result = ShardedJedis.rpush(getBytesKey(key), (byte[][])set.toArray());
            logger.debug("setSetObjectAdd {} = {}", key, value);
        } catch (Exception e) {
            logger.warn("setSetObjectAdd {} = {}", key, value, e);
        } finally {
            returnResource(ShardedJedis);
        }
        return result;
    }
    
    /**
     * 获取Map缓存
     * @param key 键
     * @return 值
     */
    public static Map<String, String> getMap(String key) {
        Map<String, String> value = null;
        ShardedJedis ShardedJedis = null;
        try {
            ShardedJedis = getResource();
            if (ShardedJedis.exists(key)) {
                value = ShardedJedis.hgetAll(key);
                logger.debug("getMap {} = {}", key, value);
            }
        } catch (Exception e) {
            logger.warn("getMap {} = {}", key, value, e);
        } finally {
            returnResource(ShardedJedis);
        }
        return value;
    }
    
    /**
     * 获取Map缓存
     * @param key 键
     * @return 值
     */
    public static Map<String, Object> getObjectMap(String key) {
        Map<String, Object> value = null;
        ShardedJedis ShardedJedis = null;
        try {
            ShardedJedis = getResource();
            if (ShardedJedis.exists(getBytesKey(key))) {
                value = Maps.newHashMap();
                Map<byte[], byte[]> map = ShardedJedis.hgetAll(getBytesKey(key));
                for (Map.Entry<byte[], byte[]> e : map.entrySet()){
                    value.put(StringUtils.toString(e.getKey()), toObject(e.getValue()));
                }
                logger.debug("getObjectMap {} = {}", key, value);
            }
        } catch (Exception e) {
            logger.warn("getObjectMap {} = {}", key, value, e);
        } finally {
            returnResource(ShardedJedis);
        }
        return value;
    }
    
    /**
     * 设置Map缓存
     * @param key 键
     * @param value 值
     * @param cacheSeconds 超时时间，0为不超时
     * @return
     */
    public static String setMap(String key, Map<String, String> value, int cacheSeconds) {
        String result = null;
        ShardedJedis ShardedJedis = null;
        try {
            ShardedJedis = getResource();
            if (ShardedJedis.exists(key)) {
                ShardedJedis.del(key);
            }
            result = ShardedJedis.hmset(key, value);
            if (cacheSeconds != 0) {
                ShardedJedis.expire(key, cacheSeconds);
            }
            logger.debug("setMap {} = {}", key, value);
        } catch (Exception e) {
            logger.warn("setMap {} = {}", key, value, e);
        } finally {
            returnResource(ShardedJedis);
        }
        return result;
    }
    
    /**
     * 设置Map缓存
     * @param key 键
     * @param value 值
     * @param cacheSeconds 超时时间，0为不超时
     * @return
     */
    public static String setObjectMap(String key, Map<String, Object> value, int cacheSeconds) {
        String result = null;
        ShardedJedis ShardedJedis = null;
        try {
            ShardedJedis = getResource();
            if (ShardedJedis.exists(getBytesKey(key))) {
                ShardedJedis.del(key);
            }
            Map<byte[], byte[]> map = Maps.newHashMap();
            for (Map.Entry<String, Object> e : value.entrySet()){
                map.put(getBytesKey(e.getKey()), toBytes(e.getValue()));
            }
            result = ShardedJedis.hmset(getBytesKey(key), (Map<byte[], byte[]>)map);
            if (cacheSeconds != 0) {
                ShardedJedis.expire(key, cacheSeconds);
            }
            logger.debug("setObjectMap {} = {}", key, value);
        } catch (Exception e) {
            logger.warn("setObjectMap {} = {}", key, value, e);
        } finally {
            returnResource(ShardedJedis);
        }
        return result;
    }
    
    /**
     * 向Map缓存中添加值
     * @param key 键
     * @param value 值
     * @return
     */
    public static String mapPut(String key, Map<String, String> value) {
        String result = null;
        ShardedJedis ShardedJedis = null;
        try {
            ShardedJedis = getResource();
            result = ShardedJedis.hmset(key, value);
            logger.debug("mapPut {} = {}", key, value);
        } catch (Exception e) {
            logger.warn("mapPut {} = {}", key, value, e);
        } finally {
            returnResource(ShardedJedis);
        }
        return result;
    }
    
    /**
     * 向Map缓存中添加值
     * @param key 键
     * @param value 值
     * @return
     */
    public static String mapObjectPut(String key, Map<String, Object> value) {
        String result = null;
        ShardedJedis ShardedJedis = null;
        try {
            ShardedJedis = getResource();
            Map<byte[], byte[]> map = Maps.newHashMap();
            for (Map.Entry<String, Object> e : value.entrySet()){
                map.put(getBytesKey(e.getKey()), toBytes(e.getValue()));
            }
            result = ShardedJedis.hmset(getBytesKey(key), (Map<byte[], byte[]>)map);
            logger.debug("mapObjectPut {} = {}", key, value);
        } catch (Exception e) {
            logger.warn("mapObjectPut {} = {}", key, value, e);
        } finally {
            returnResource(ShardedJedis);
        }
        return result;
    }
    
    /**
     * 移除Map缓存中的值
     * @param key 键
     * @param value 值
     * @return
     */
    public static long mapRemove(String key, String mapKey) {
        long result = 0;
        ShardedJedis ShardedJedis = null;
        try {
            ShardedJedis = getResource();
            result = ShardedJedis.hdel(key, mapKey);
            logger.debug("mapRemove {}  {}", key, mapKey);
        } catch (Exception e) {
            logger.warn("mapRemove {}  {}", key, mapKey, e);
        } finally {
            returnResource(ShardedJedis);
        }
        return result;
    }
    
    /**
     * 移除Map缓存中的值
     * @param key 键
     * @param value 值
     * @return
     */
    public static long mapObjectRemove(String key, String mapKey) {
        long result = 0;
        ShardedJedis ShardedJedis = null;
        try {
            ShardedJedis = getResource();
            result = ShardedJedis.hdel(getBytesKey(key), getBytesKey(mapKey));
            logger.debug("mapObjectRemove {}  {}", key, mapKey);
        } catch (Exception e) {
            logger.warn("mapObjectRemove {}  {}", key, mapKey, e);
        } finally {
            returnResource(ShardedJedis);
        }
        return result;
    }
    
    /**
     * 判断Map缓存中的Key是否存在
     * @param key 键
     * @param value 值
     * @return
     */
    public static boolean mapExists(String key, String mapKey) {
        boolean result = false;
        ShardedJedis ShardedJedis = null;
        try {
            ShardedJedis = getResource();
            result = ShardedJedis.hexists(key, mapKey);
            logger.debug("mapExists {}  {}", key, mapKey);
        } catch (Exception e) {
            logger.warn("mapExists {}  {}", key, mapKey, e);
        } finally {
            returnResource(ShardedJedis);
        }
        return result;
    }
    
    /**
     * 判断Map缓存中的Key是否存在
     * @param key 键
     * @param value 值
     * @return
     */
    public static boolean mapObjectExists(String key, String mapKey) {
        boolean result = false;
        ShardedJedis ShardedJedis = null;
        try {
            ShardedJedis = getResource();
            result = ShardedJedis.hexists(getBytesKey(key), getBytesKey(mapKey));
            logger.debug("mapObjectExists {}  {}", key, mapKey);
        } catch (Exception e) {
            logger.warn("mapObjectExists {}  {}", key, mapKey, e);
        } finally {
            returnResource(ShardedJedis);
        }
        return result;
    }
    
    /**
     * 删除缓存
     * @param key 键
     * @return
     */
    public static long del(String key) {
        long result = 0;
        ShardedJedis ShardedJedis = null;
        try {
            ShardedJedis = getResource();
            if (ShardedJedis.exists(key)){
                result = ShardedJedis.del(key);
                logger.debug("del {}", key);
            }else{
                logger.debug("del {} not exists", key);
            }
        } catch (Exception e) {
            logger.warn("del {}", key, e);
        } finally {
            returnResource(ShardedJedis);
        }
        return result;
    }

    /**
     * 删除缓存
     * @param key 键
     * @return
     */
    public static long delObject(String key) {
        long result = 0;
        ShardedJedis ShardedJedis = null;
        try {
            ShardedJedis = getResource();
            if (ShardedJedis.exists(getBytesKey(key))){
                result = ShardedJedis.del(getBytesKey(key));
                logger.debug("delObject {}", key);
            }else{
                logger.debug("delObject {} not exists", key);
            }
        } catch (Exception e) {
            logger.warn("delObject {}", key, e);
        } finally {
            returnResource(ShardedJedis);
        }
        return result;
    }
    
    /**
     * 缓存是否存在
     * @param key 键
     * @return
     */
    public static boolean exists(String key) {
        boolean result = false;
        ShardedJedis ShardedJedis = null;
        try {
            ShardedJedis = getResource();
            result = ShardedJedis.exists(key);
            logger.debug("exists {}", key);
        } catch (Exception e) {
            logger.warn("exists {}", key, e);
        } finally {
            returnResource(ShardedJedis);
        }
        return result;
    }
    
    /**
     * 缓存是否存在
     * @param key 键
     * @return
     */
    public static boolean existsObject(String key) {
        boolean result = false;
        ShardedJedis ShardedJedis = null;
        try {
            ShardedJedis = getResource();
            result = ShardedJedis.exists(getBytesKey(key));
            logger.debug("existsObject {}", key);
        } catch (Exception e) {
            logger.warn("existsObject {}", key, e);
        } finally {
            returnResource(ShardedJedis);
        }
        return result;
    }

    /**
     * 获取资源
     * @return
     * @throws JedisException
     */
    public static ShardedJedis getResource() throws JedisException {
        ShardedJedis ShardedJedis = null;
        try {
            ShardedJedis = shardedJedisPool.getResource();
//            logger.debug("getResource.", ShardedJedis);
        } catch (JedisException e) {
            logger.warn("getResource.", e);
            returnBrokenResource(ShardedJedis);
            throw e;
        }
        return ShardedJedis;
    }

    /**
     * 归还资源
     * @param ShardedJedis
     * @param isBroken
     */
    public static void returnBrokenResource(ShardedJedis ShardedJedis) {
        if (ShardedJedis != null) {
            shardedJedisPool.returnBrokenResource(ShardedJedis);
        }
    }
    
    /**
     * 释放资源
     * @param ShardedJedis
     * @param isBroken
     */
    public static void returnResource(ShardedJedis ShardedJedis) {
        if (ShardedJedis != null) {
            shardedJedisPool.returnResource(ShardedJedis);
        }
    }

    /**
     * 获取byte[]类型Key
     * @param key
     * @return
     */
    public static byte[] getBytesKey(Object object){
        if(object instanceof String){
            return StringUtils.getBytes((String)object);
        }else{
            return ObjectUtils.serialize(object);
        }
    }
    
    /**
     * Object转换byte[]类型
     * @param key
     * @return
     */
    public static byte[] toBytes(Object object){
        return ObjectUtils.serialize(object);
    }

    /**
     * byte[]型转换Object
     * @param key
     * @return
     */
    public static Object toObject(byte[] bytes){
        return ObjectUtils.unserialize(bytes);
    }

}
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原文地址：https://www.cnblogs.com/shaohz2014/p/6046161.html