Redis6搭建集群并在SpringBoot中使用RedisTemplate

        Redis Cluster 一般由多个节点组成，节点数量至少为 6 个才能保证组成完整高可用的集群，其中三个为主节点，三个为从节点。三个主节点会分配槽，处理客户端的命令请求，而从节点可用在主节点故障后，顶替主节点。 

        如上图所示，该集群中包含6个Redis节点3个主服务器3个从服务器，分别为M1，M2，M3，S1，S2，S3。除了主从 Redis 节点之间进行数据复制外，所有 Redis 节点之间采用 Gossip 协议进行通信，交换维护节点元数据信息。一般来说，主Redis节点会处理Clients的读写操作，而从节点只处理读操作。

1.进入redis目录中，打开redis.conf文件，注释掉bind 127.0.0.1，bind自己服务器的IP。并将protected -mode yes改为no。daemonize 默认是no，需要改成yes，以守护进程运行。

2.分别创建6个conf文件对应不同的端口号，正常每个节点对应一台服务器，为了方便测试本次使用一台服务来搭建集群模式。

redis6379.conf

include redis.conf
pidfile /var/run/redis_6379.pid
port 6379
dbfilename dump6379.rdb
cluster-enabled yes
cluster-node-timeout 15000
cluster-config-file nodes-6379.conf 

redis6380.conf

include redis.conf
pidfile /var/run/redis_6380.pid
port 6380
dbfilename dump6380.rdb
cluster-enabled yes
cluster-node-timeout 15000
cluster-config-file nodes-6380.conf

redis6381.conf

include redis.conf
pidfile /var/run/redis_6381.pid
port 6381
dbfilename dump6381.rdb
cluster-enabled yes
cluster-node-timeout 15000
cluster-config-file nodes-6381.conf 

redis6389.conf 

include redis.conf
pidfile /var/run/redis_6389.pid
port 6389
dbfilename dump6389.rdb
cluster-enabled yes
cluster-node-timeout 15000
cluster-config-file nodes-6389.conf 

redis6390.conf

include redis.conf
pidfile /var/run/redis_6390.pid
port 6390
dbfilename dump6390.rdb
cluster-enabled yes
cluster-node-timeout 15000
cluster-config-file nodes-6390.conf 

redis6391.conf

include redis.conf
pidfile /var/run/redis_6391.pid
port 6391
dbfilename dump6391.rdb
cluster-enabled yes
cluster-node-timeout 15000
cluster-config-file nodes-6391.conf 

3.进入到redis安装目录启动redis服务（如之前有nodes、rdb、aof文件请先删除，非则可能会报错）。

4.进入src目录中执行如下命令搭建集群。

redis-cli --cluster create --cluster-replicas 1 IP:6379 IP:6380 IP:6381 IP:6389 IP:6390 IP:6391

5.进入其中任意一个节点，执行命令查看当前节点状态

redis-cli - h ip -p 端口
info replication

1.pom文件中加入依赖。

    org.springframework.boot
    spring-boot-starter-data-redis

2.创建redis配置类.

package com.wzy.demo.config;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;

@Configuration
public class RedisConfig {

    @Autowired
    private RedisTemplate redisTemplate;

    
    @Bean
    public RedisTemplate redisTemplateInit() {
        //设置序列化Key的实例化对象
        redisTemplate.setKeySerializer(new StringRedisSerializer());
        //设置序列化Value的实例化对象
        redisTemplate.setValueSerializer(new GenericJackson2JsonRedisSerializer());
        return redisTemplate;
    }

}

3.创建RedisUtil工具类

package com.wzy.demo.util;

import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.TimeUnit;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Component;
import org.springframework.util.CollectionUtils;
import javax.annotation.Resource;

@Component
public class RedisUtil {
    @Resource
    private RedisTemplate redisTemplate;

    public void setRedisTemplate(RedisTemplate redisTemplate) {
        this.redisTemplate = redisTemplate;
    }
    //=============================common============================

    
    public boolean expire(String key, long time) {
        try {
            if (time > 0) {
                redisTemplate.expire(key, time, TimeUnit.SECONDS);
            }
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    
    public long getExpire(String key) {
        return redisTemplate.getExpire(key, TimeUnit.SECONDS);
    }

    
    public boolean hasKey(String key) {
        try {
            return redisTemplate.hasKey(key);
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    
    @SuppressWarnings("unchecked")
    public void del(String... key) {
        if (key != null && key.length > 0) {
            if (key.length == 1) {
                redisTemplate.delete(key[0]);
            } else {
                redisTemplate.delete(CollectionUtils.arrayToList(key));
            }
        }
    }

    //============================String=============================

    
    public Object get(String key) {
        return key == null ? null : redisTemplate.opsForValue().get(key);
    }

    
    public boolean set(String key, Object value) {
        try {
            redisTemplate.opsForValue().set(key, value);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }

    }

    
    public boolean set(String key, Object value, long time) {
        try {
            if (time > 0) {
                redisTemplate.opsForValue().set(key, value, time, TimeUnit.SECONDS);
            } else {
                set(key, value);
            }
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    
    public long incr(String key, long delta) {
        if (delta < 0) {
            throw new RuntimeException("递增因子必须大于0");
        }
        return redisTemplate.opsForValue().increment(key, delta);
    }

    
    public long decr(String key, long delta) {
        if (delta < 0) {
            throw new RuntimeException("递减因子必须大于0");
        }
        return redisTemplate.opsForValue().increment(key, -delta);
    }

    //================================Map=================================

    
    public Object hget(String key, String item) {
        return redisTemplate.opsForHash().get(key, item);
    }

    
    public Map hmget(String key) {
        return redisTemplate.opsForHash().entries(key);
    }

    
    public boolean hmset(String key, Map map) {
        try {
            redisTemplate.opsForHash().putAll(key, map);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    
    public boolean hmset(String key, Map map, long time) {
        try {
            redisTemplate.opsForHash().putAll(key, map);
            if (time > 0) {
                expire(key, time);
            }
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    
    public boolean hset(String key, String item, Object value) {
        try {
            redisTemplate.opsForHash().put(key, item, value);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    
    public boolean hset(String key, String item, Object value, long time) {
        try {
            redisTemplate.opsForHash().put(key, item, value);
            if (time > 0) {
                expire(key, time);
            }
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    
    public void hdel(String key, Object... item) {
        redisTemplate.opsForHash().delete(key, item);
    }

    
    public boolean hHasKey(String key, String item) {
        return redisTemplate.opsForHash().hasKey(key, item);
    }

    
    public double hincr(String key, String item, double by) {
        return redisTemplate.opsForHash().increment(key, item, by);
    }

    
    public double hdecr(String key, String item, double by) {
        return redisTemplate.opsForHash().increment(key, item, -by);
    }

    //============================set=============================

    
    public Set