SpringBoot使用Lettuce集成redis

1、引入依赖

<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>

这里要注意的是Lettuce是SpringBoot 2.x后才使用的，之前使用的是Jedis作为连接池，请注意自己项目的SpringBoot版本。

2、RedisConfig配置类

package controller;

import io.lettuce.core.ClientOptions;
import io.lettuce.core.ReadFrom;
import io.lettuce.core.cluster.ClusterClientOptions;
import io.lettuce.core.cluster.ClusterTopologyRefreshOptions;
import io.lettuce.core.resource.ClientResources;
import io.lettuce.core.resource.DefaultClientResources;
import org.apache.commons.pool2.impl.GenericObjectPoolConfig;
import org.springframework.boot.autoconfigure.data.redis.RedisProperties;
import org.springframework.cache.annotation.CachingConfigurerSupport;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.RedisClusterConfiguration;
import org.springframework.data.redis.connection.RedisPassword;
import org.springframework.data.redis.connection.lettuce.LettuceClientConfiguration;
import org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory;
import org.springframework.data.redis.connection.lettuce.LettucePoolingClientConfiguration;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.StringRedisSerializer;

import javax.annotation.Resource;
import java.time.Duration;

@Configuration
public class RedisConfig extends CachingConfigurerSupport{

    @Resource
    private RedisProperties redisProperties;

    public GenericObjectPoolConfig<?> genericObjectPoolConfig(RedisProperties.Pool properties) {
        GenericObjectPoolConfig<?> config = new GenericObjectPoolConfig<>();
        config.setMaxTotal(properties.getMaxActive());
        config.setMaxIdle(properties.getMaxIdle());
        config.setMinIdle(properties.getMinIdle());
        if (properties.getTimeBetweenEvictionRuns() != null) {
            config.setTimeBetweenEvictionRunsMillis(properties.getTimeBetweenEvictionRuns().toMillis());
        }
        if (properties.getMaxWait() != null) {
            config.setMaxWaitMillis(properties.getMaxWait().toMillis());
        }
        return config;
    }

    @Bean
    public DefaultClientResources lettuceClientResources() {
        return DefaultClientResources.create();
    }

    @Bean(destroyMethod = "destroy")
    public LettuceConnectionFactory lettuceConnectionFactory(ClientResources clientResources) {

        //开启 自适应集群拓扑刷新和周期拓扑刷新
        ClusterTopologyRefreshOptions clusterTopologyRefreshOptions = ClusterTopologyRefreshOptions.builder()
                // 开启全部自适应刷新
                .enableAllAdaptiveRefreshTriggers() // 开启自适应刷新,自适应刷新不开启,Redis集群变更时将会导致连接异常
                // 自适应刷新超时时间(默认30秒)
                //默认关闭开启后时间为30秒
                .adaptiveRefreshTriggersTimeout(Duration.ofSeconds(15))
                // 开周期刷新
                // 默认关闭开启后时间为60秒 ClusterTopologyRefreshOptions.DEFAULT_REFRESH_PERIOD 60  .enablePeriodicRefresh(Duration.ofSeconds(2)) = .enablePeriodicRefresh().refreshPeriod(Duration.ofSeconds(2))
                .enablePeriodicRefresh(Duration.ofSeconds(15))
                .build();

        // https://github.com/lettuce-io/lettuce-core/wiki/Client-Options
        ClientOptions clientOptions = ClusterClientOptions.builder()
                .topologyRefreshOptions(clusterTopologyRefreshOptions)
                .build();

        LettuceClientConfiguration clientConfig = LettucePoolingClientConfiguration.builder()
                .clientResources(clientResources)
                .poolConfig(genericObjectPoolConfig(redisProperties.getLettuce().getPool()))
                .readFrom(ReadFrom.MASTER_PREFERRED)
                .clientOptions(clientOptions)
                //默认RedisURI.DEFAULT_TIMEOUT 60
                .commandTimeout(redisProperties.getTimeout())
                .build();

        RedisClusterConfiguration clusterConfiguration = new RedisClusterConfiguration(redisProperties.getCluster().getNodes());
        clusterConfiguration.setPassword(RedisPassword.of(redisProperties.getPassword()));
     // clusterConfiguration.setMaxRedirects(redisProperties.getCluster().getMaxRedirects());

        return new LettuceConnectionFactory(clusterConfiguration, clientConfig);
    }

    @Bean
    public RedisTemplate<String, Object> redisTemplate(LettuceConnectionFactory lettuceConnectionFactory) {

        RedisTemplate<String, Object> redisTemplate = new RedisTemplate<>();
        redisTemplate.setConnectionFactory(lettuceConnectionFactory);
        StringRedisSerializer serializer = new StringRedisSerializer();
        redisTemplate.setDefaultSerializer(serializer);
        redisTemplate.setKeySerializer(serializer);
        redisTemplate.setValueSerializer(serializer);

        /**必须执行这个函数,初始化RedisTemplate*/
        redisTemplate.afterPropertiesSet();
        return redisTemplate;
    }

}

3、yml文件配置

spring:
  redis:
    cluster:
      nodes[0]: 10.111.111.111:6379
    lettuce:
##Redis服务器连接密码（默认为空）
#      password:
##连接池最大连接数（使用负值表示没有限制）
      pool:
        max-active: 8
#连接池最大阻塞等待时间（使用负值表示没有限制）
        max-wait: -1
#连接池中的最大空闲连接
        max-idle: 8
#连接池中的最小空闲连接
        min-idle: 0
#连接超时时间（毫秒）
    timeout: 30000

4、遇到的几个小坑

错误1：

template not initialized; call afterPropertiesSet() before using it

解决方法就是，使用redisTemplate的时候，采用@Autowired注入的方式，不要直接new 出来

错误2：

ERR This instance has cluster support disabled

这个是因为redis没有开启集群模式，在安装redis的目录找到redis配置文件redis.conf，里面会找到配置

# cluster-enabled yes

把注释去掉，然后重启就可以了。

错误3：

Cannot determine a partition to read for slot

这个是因为开启redis集群后，但是slot未分配，解决方式是在redis服务器上执行：

redis-cli --cluster fix 10.111.111.111:6379 -a 123456（密码使用自己配置的）

中途弹出Fix these slots by covering with a random node? (type 'yes' to accept):

输入yes即可。

SpringBoot使用Lettuce集成redis

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