Springboot2.x集成单节点Redis

说明

在Springboot 1.x版本中，默认使用Jedis客户端来操作Redis，而在Springboot 2.x 版本中，默认使用Lettuce客户端来操作Redis。Springboot 提供了RedisTemplate来统一封装了对Redis操作，开发者只需要使用RedisTemplate 就可以实现，而不用关心具体的操作实现。

准备条件

pom.xml中引入相关jar

        <!-- 集成Redis -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>
    
        <!-- Jedis 客户端 -->
        <dependency>
            <groupId>redis.clients</groupId>
            <artifactId>jedis</artifactId>
        </dependency>
    
        <!-- lettuce客户端需要使用到 -->
          <dependency>
                <groupId>org.apache.commons</groupId>
                <artifactId>commons-pool2</artifactId>
           </dependency>

application.yml配置属性示例。

spring:
 redis:
   host: 192.168.8.121
   port: 6379
   password: enjoyitlife
   timeout: 30000
   jedis:
      pool:
       max-active: 256
       max-wait: 30000
       max-idle: 64
       min-idle: 32
   lettuce:
      pool:
        max-active: 256
        max-idle: 64
        max-wait: 30000
        min-idle: 32

单机模式下的整合教程

Jedis客户端整合

JedisSingleConfig.java 相关配置

package top.enjoyitlife.redis.jedis;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Profile;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.connection.RedisStandaloneConfiguration;
import org.springframework.data.redis.connection.jedis.JedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.StringRedisSerializer;

@Configuration
@Profile("jedisSingle")
public class JedisSingleConfig {

    @Value("${spring.redis.host}")
    private String host;
    @Value("${spring.redis.port}")
    private int port;
    @Value("${spring.redis.password}")
    private String password;
    @Value("${spring.redis.timeout}")
    private int timeout;
    @Value("${spring.redis.jedis.pool.max-idle}")
    private int maxIdle;
    @Value("${spring.redis.jedis.pool.max-wait}")
    private long maxWaitMillis;
    
      @Bean
       public JedisConnectionFactory redisConnectionFactory()  throws Exception{
            RedisStandaloneConfiguration rc= new RedisStandaloneConfiguration();
            rc.setHostName(host);
            rc.setPort(port);
            rc.setPassword(password);
            JedisConnectionFactory connectionFactory = new JedisConnectionFactory(rc);
            return connectionFactory;
     }
      
      
      @Bean
        public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory redisConnectionFactory){
            RedisTemplate<String, Object> template = new RedisTemplate<String, Object>();
            template.setKeySerializer(new StringRedisSerializer());
            template.setValueSerializer(new StringRedisSerializer());
            template.setConnectionFactory(redisConnectionFactory);
            return template;
        }
      
}

Lettuce客户端整合

package top.enjoyitlife.redis.lettuce;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Profile;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.connection.RedisStandaloneConfiguration;
import org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.StringRedisSerializer;

@Configuration
@Profile("lettuceSingle")
public class LettuceSingleConfig {

    @Value("${spring.redis.host}")
    private String host;
    @Value("${spring.redis.port}")
    private int port;
    @Value("${spring.redis.password}")
    private String password;
    
    @Bean
    public LettuceConnectionFactory redisConnectionFactory() {
        RedisStandaloneConfiguration rc= new RedisStandaloneConfiguration();
        rc.setHostName(host);
        rc.setPort(port);
        rc.setPassword(password);
        // 关键区别点
        return new LettuceConnectionFactory(rc);
    }
    
    @Bean
    public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory redisConnectionFactory){
        RedisTemplate<String, Object> template = new RedisTemplate<String, Object>();
        template.setKeySerializer(new StringRedisSerializer());
        template.setValueSerializer(new StringRedisSerializer());
        template.setConnectionFactory(redisConnectionFactory);
        return template;
    }
    
    
}

Springboot通过RedisStandaloneConfiguration来统一了连接方式，区别Jedis客户端是通过JedisConnectionFactory进行初始化，而Lettuce客户端是通过LettuceConnectionFactory初始化。

单元测试

Jedis单元测试

JedisSingleTest.java 单元测试代码。

package top.enjoyitlife.redis.jedis;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.test.context.ActiveProfiles;

@SpringBootTest
@ActiveProfiles("jedisSingle")
class JedisSingleTest {

    @Autowired
    private RedisTemplate<String, Object> redisTemplate;
    
    @Test
    void contextLoads() {
        String name=redisTemplate.opsForValue().get("name").toString();
        System.out.println(name);
    }
}

Lettuce 单元测试

package top.enjoyitlife.redis.lettuce;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.test.context.ActiveProfiles;

@SpringBootTest
@ActiveProfiles("lettuceSentinel")
class LettuceSingleTest {

    @Autowired
    private RedisTemplate<String, Object> redisTemplate;
    
    
    @Test
    void contextLoads() {
        String name = redisTemplate.opsForValue().get("name").toString();
        System.out.println(name);
    }

}

补充

Jedis在是直接连接的的redis实例，如果在多线程环境下是非线程安全的，只有使用连接池，为每个Jedis增加物理连接。

而Lettuce的连接是基于Netty事件驱动模型的，连接实例可以在多个线程间并发访问，StatefulRedisConnection是线程安全的，可以满足多线程环境下的并发访问。

从Springboot 2.X默认采用了Lettuce客户端来看，官方还是建议使用Lettuce。