面向接口编程实现不改代码实现Redis单机/集群之间的切换-数据库

开发中一般使用Redis单机，线上使用Redis集群，因此需要实现单机和集群之间的灵活切换

pom配置：

<!-- Redis客户端 -->
        <dependency>
            <groupId>redis.clients</groupId>
            <artifactId>jedis</artifactId>
        </dependency>
    </dependencies>

Redis单机和集群之间的灵活切换的封装：

JedisClient.java 接口

import java.util.List;

public interface JedisClient {

    String set(String key, String value);
    String get(String key);
    Boolean exists(String key);
    Long expire(String key, int seconds);
    Long ttl(String key);
    Long incr(String key);
    Long hset(String key, String field, String value);
    String hget(String key, String field);
    Long hdel(String key, String... field);
    Boolean hexists(String key, String field);
    List<String> hvals(String key);
    Long del(String key);
}

分别实现JedisClient单机版本和集群版本：

JedisClientCluster.java JedisClient集群版：

import java.util.List;

import redis.clients.jedis.JedisCluster;

public class JedisClientCluster implements JedisClient {
    
    private JedisCluster jedisCluster;
    

    public JedisCluster getJedisCluster() {
        return jedisCluster;
    }

    public void setJedisCluster(JedisCluster jedisCluster) {
        this.jedisCluster = jedisCluster;
    }

    @Override
    public String set(String key, String value) {
        return jedisCluster.set(key, value);
    }

    @Override
    public String get(String key) {
        return jedisCluster.get(key);
    }

    @Override
    public Boolean exists(String key) {
        return jedisCluster.exists(key);
    }

    @Override
    public Long expire(String key, int seconds) {
        return jedisCluster.expire(key, seconds);
    }

    @Override
    public Long ttl(String key) {
        return jedisCluster.ttl(key);
    }

    @Override
    public Long incr(String key) {
        return jedisCluster.incr(key);
    }

    @Override
    public Long hset(String key, String field, String value) {
        return jedisCluster.hset(key, field, value);
    }

    @Override
    public String hget(String key, String field) {
        return jedisCluster.hget(key, field);
    }

    @Override
    public Long hdel(String key, String... field) {
        return jedisCluster.hdel(key, field);
    }

    @Override
    public Boolean hexists(String key, String field) {
        return jedisCluster.hexists(key, field);
    }

    @Override
    public List<String> hvals(String key) {
        return jedisCluster.hvals(key);
    }

    @Override
    public Long del(String key) {
        return jedisCluster.del(key);
    }

}

JedisClientPool.java JedisClient单机版

import java.util.List;

import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;

public class JedisClientPool implements JedisClient {
    
    private JedisPool jedisPool;

    public JedisPool getJedisPool() {
        return jedisPool;
    }

    public void setJedisPool(JedisPool jedisPool) {
        this.jedisPool = jedisPool;
    }

    @Override
    public String set(String key, String value) {
        Jedis jedis = jedisPool.getResource();
        String result = jedis.set(key, value);
        jedis.close();
        return result;
    }

    @Override
    public String get(String key) {
        Jedis jedis = jedisPool.getResource();
        String result = jedis.get(key);
        jedis.close();
        return result;
    }

    @Override
    public Boolean exists(String key) {
        Jedis jedis = jedisPool.getResource();
        Boolean result = jedis.exists(key);
        jedis.close();
        return result;
    }

    @Override
    public Long expire(String key, int seconds) {
        Jedis jedis = jedisPool.getResource();
        Long result = jedis.expire(key, seconds);
        jedis.close();
        return result;
    }

    @Override
    public Long ttl(String key) {
        Jedis jedis = jedisPool.getResource();
        Long result = jedis.ttl(key);
        jedis.close();
        return result;
    }

    @Override
    public Long incr(String key) {
        Jedis jedis = jedisPool.getResource();
        Long result = jedis.incr(key);
        jedis.close();
        return result;
    }

    @Override
    public Long hset(String key, String field, String value) {
        Jedis jedis = jedisPool.getResource();
        Long result = jedis.hset(key, field, value);
        jedis.close();
        return result;
    }

    @Override
    public String hget(String key, String field) {
        Jedis jedis = jedisPool.getResource();
        String result = jedis.hget(key, field);
        jedis.close();
        return result;
    }

    @Override
    public Long hdel(String key, String... field) {
        Jedis jedis = jedisPool.getResource();
        Long result = jedis.hdel(key, field);
        jedis.close();
        return result;
    }

    @Override
    public Boolean hexists(String key, String field) {
        Jedis jedis = jedisPool.getResource();
        Boolean result = jedis.hexists(key, field);
        jedis.close();
        return result;
    }

    @Override
    public List<String> hvals(String key) {
        Jedis jedis = jedisPool.getResource();
        List<String> result = jedis.hvals(key);
        jedis.close();
        return result;
    }

    @Override
    public Long del(String key) {
        Jedis jedis = jedisPool.getResource();
        Long result = jedis.del(key);
        jedis.close();
        return result;
    }

}

实际使用方法：

applicationContext-redis.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd
    http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.2.xsd
    http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.2.xsd">
    
    <!-- 连接redis单机版 -->
    <bean id="jedisClientPool" class="cn.e3mall.common.jedis.JedisClientPool">
        <property name="jedisPool" ref="jedisPool"></property>
    </bean>
    <bean id="jedisPool" class="redis.clients.jedis.JedisPool">
        <constructor-arg name="host" value="192.168.25.162"/>
        <constructor-arg name="port" value="6379"/>
    </bean>
    <!-- 连接redis集群 -->
    <!-- <bean >
        <property name="jedisCluster" ref="jedisCluster"/>
    </bean>
    <bean >
        <constructor-arg name="nodes">
            <set>
                <bean class="redis.clients.jedis.HostAndPort">
                    <constructor-arg name="host" value="192.168.25.162"></constructor-arg>
                    <constructor-arg name="port" value="7001"></constructor-arg>
                </bean> 
                <bean class="redis.clients.jedis.HostAndPort">
                    <constructor-arg name="host" value="192.168.25.162"></constructor-arg>
                    <constructor-arg name="port" value="7002"></constructor-arg>
                </bean> 
                <bean class="redis.clients.jedis.HostAndPort">
                    <constructor-arg name="host" value="192.168.25.162"></constructor-arg>
                    <constructor-arg name="port" value="7003"></constructor-arg>
                </bean> 
                <bean class="redis.clients.jedis.HostAndPort">
                    <constructor-arg name="host" value="192.168.25.162"></constructor-arg>
                    <constructor-arg name="port" value="7004"></constructor-arg>
                </bean> 
                <bean class="redis.clients.jedis.HostAndPort">
                    <constructor-arg name="host" value="192.168.25.162"></constructor-arg>
                    <constructor-arg name="port" value="7005"></constructor-arg>
                </bean> 
                <bean class="redis.clients.jedis.HostAndPort">
                    <constructor-arg name="host" value="192.168.25.162"></constructor-arg>
                    <constructor-arg name="port" value="7006"></constructor-arg>
                </bean> 
            </set>
        </constructor-arg>
    </bean> -->
</beans>

使用：

    @Test
    public void testJedisClient() throws Exception {
        //初始化spring容器
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("classpath:spring/applicationContext-redis.xml");
        //从容器中获得JedisClient对象
        JedisClient jedisClient = applicationContext.getBean(JedisClient.class);
        jedisClient.set("mytest", "jedisClient");
        String string = jedisClient.get("mytest");
        System.out.println(string);
        
        
    }

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