Redis哨兵java实现

---

前言

---

一、添加依赖

因我的构建cloud项目，这里直接把可能会用的依赖都放到一起

        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-pool2</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>

二、改好RedisConfig

前提是已经建好Redis的springboot项目，按网上的操作就行。我的是在这基础上操作

package com.ams.common.redis.config;
import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.jsontype.impl.LaissezFaireSubTypeValidator;
import org.apache.commons.pool2.impl.GenericObjectPoolConfig;
import org.springframework.boot.autoconfigure.AutoConfigureBefore;
import org.springframework.boot.autoconfigure.data.redis.RedisAutoConfiguration;
import org.springframework.boot.autoconfigure.data.redis.RedisProperties;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.connection.RedisNode;
import org.springframework.data.redis.connection.RedisSentinelConfiguration;
import org.springframework.data.redis.connection.RedisServer;
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.Jackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;
import java.time.Duration;
import java.util.List;

@Configuration
@EnableConfigurationProperties(RedisProperties.class)
public class RedisConfig {

    private final RedisProperties properties;

    public RedisConfig(RedisProperties properties){
        this.properties = properties;
    }

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

        RedisTemplate<String, Object> redisTemplate = new RedisTemplate<>();
        redisTemplate.setConnectionFactory(getConnectionFactory());

        // 用Jackson2JsonRedisSerializer来序列化和反序列化redis的value值
        StringRedisSerializer stringRedisSerializer = new StringRedisSerializer();
        redisTemplate.setKeySerializer(stringRedisSerializer); // key
        Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
        ObjectMapper objectMapper = new ObjectMapper();
        // 指定要序列化的域(field,get,set)，访问修饰符(public,private,protected)
        objectMapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        objectMapper.activateDefaultTyping(LaissezFaireSubTypeValidator.instance, ObjectMapper.DefaultTyping.NON_FINAL);
        jackson2JsonRedisSerializer.setObjectMapper(objectMapper);

        redisTemplate.setValueSerializer(jackson2JsonRedisSerializer); //value

        redisTemplate.setHashKeySerializer(stringRedisSerializer);
        redisTemplate.setHashValueSerializer(jackson2JsonRedisSerializer);

        redisTemplate.afterPropertiesSet();
        return redisTemplate;
    }

    @Bean
    public RedisConnectionFactory getConnectionFactory() {
        //哨兵模式
        RedisSentinelConfiguration configuration = new RedisSentinelConfiguration();
        configuration.setMaster(properties.getSentinel().getMaster());
        configuration.setPassword(properties.getPassword());
        configuration.setDatabase(properties.getDatabase());
        List<String> nodes = properties.getSentinel().getNodes();
        nodes.forEach(node -> {
            String[] str = node.split(":");
            RedisNode redisServer = new RedisServer(str[0], Integer.parseInt(str[1]));
            configuration.sentinel(redisServer);
        });
        LettuceConnectionFactory factory = new LettuceConnectionFactory(configuration, getPool());
        //使用前先校验连接,这个最好是要配置：不然会带来connection reset by peer
        factory.setValidateConnection(true);
        return factory;
    }

    @Bean
    public LettuceClientConfiguration getPool() {
        GenericObjectPoolConfig genericObjectPoolConfig = new GenericObjectPoolConfig();
        //redis客户端配置:超时时间默认
        LettucePoolingClientConfiguration.LettucePoolingClientConfigurationBuilder
                builder = LettucePoolingClientConfiguration.builder().
                commandTimeout(Duration.ofMillis(60000));
        //连接池配置
        RedisProperties.Pool pool = properties.getLettuce().getPool();
        genericObjectPoolConfig.setMaxIdle(pool.getMaxIdle());
        genericObjectPoolConfig.setMinIdle(pool.getMinIdle());
        genericObjectPoolConfig.setMaxTotal(pool.getMaxActive());
        genericObjectPoolConfig.setMaxWaitMillis(pool.getMaxWait().toMillis());
        builder.shutdownTimeout(Duration.ofMillis(4000));
        builder.poolConfig(genericObjectPoolConfig);
        return builder.build();
    }

三、修改nacos中Redis的配置

redis:
  sentinel:
    master: master
    nodes: 192.168.2.237:6776,192.168.2.37:6777,192.168.2.37:6778
  password: 123456
  timeout: 1000
  database: 3
  lettuce:
    pool:
      max-active: 8
      max-wait: 1000
      max-idle: 8
      min-idle: 0

四、其他

1.踩到的坑如下：

java一直无法连接sentinel，关闭防火墙也不行
解决方法：因为之前redis配置的防火墙打开，开放端口，所以这里也不能关闭防火墙，而是要开放sentinel的几个端口。

---

随心所往，看见未来。Follow your heart，see light！

欢迎点赞、关注、留言，一起学习、交流！