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【深入浅出SpringBoot】Lettuce形式集成redis示例

前言

在 springboot 1.5.x版本的默认的Redis客户端是 Jedis实现的,springboot 2.x版本中默认客户端是用 lettuce实现的。

Lettuce 和 jedis 的都是连接 Redis Server的客户端,Jedis 在实现上是直连 redis server,多线程环境下非线程安全,除非使用连接池,为每个 redis实例增加 物理连接。

Lettuce 是 一种可伸缩,线程安全,完全非阻塞的Redis客户端,多个线程可以共享一个RedisConnection,它利用Netty NIO 框架来高效地管理多个连接,从而提供了异步和同步数据访问方式,用于构建非阻塞的反应性应用程序

本文以Lettuce形式集成Redis服务

一.导入依赖(pom.xml)

<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

二.application.propertis文件配置信息

# 主机地址
redis.cluster.host=192.168.247.13
# 最大重定向次数
redis.cluster.maxRedirects=3

# 连接池中的最大空闲连接 默认为8
generic.pool.config.maxIdle=10

# 连接池中的最小空闲连接 默认为0
generic.pool.config.minIdle=5

# 连接池中的总连接数
generic.pool.config.maxTotal=20

三.自定义 RedisTemplate

@Configuration
public class RedisConfig {
    @Value("${spring.redisURI}")
    private String redisURI;
    
    @Value("${redis.cluster.host}")
    private String host;

    //连接池配置信息(如果不用连接池可以省略这一步)
    @Bean
    //prefix,表示从配置文件读取以前缀开头的信息,注入到GenericObjectPoolConfig中
    @ConfigurationProperties(prefix="generic.pool.config")
    public GenericObjectPoolConfig genericObjectPoolConfig() {
        GenericObjectPoolConfig poolConfig = new GenericObjectPoolConfig();
        return poolConfig;
    }
    
    //lettuce客户端配置信息(如果不用连接池通过LettuceClientConfiguration来builder)
    @Bean
    public LettuceClientConfiguration lettuceClientConfiguration(GenericObjectPoolConfig genericObjectPoolConfig){
        //构造LettucePoolingClientConfiguration对象,同时加入连接池配置信息
        LettucePoolingClientConfiguration build = LettucePoolingClientConfiguration.builder().poolConfig(genericObjectPoolConfig).build();
        return build;
    }
    
    //Redis继续配置信息
    @Bean
    @ConfigurationProperties(prefix="redis.cluster")
    public RedisClusterConfiguration redisClusterConfiguration(){
        RedisClusterConfiguration redisClusterConfiguration = new RedisClusterConfiguration();
                //配置集群信息(也可以从配置文件加载)
        ArrayList<RedisNode> list = new ArrayList<>();  
        list.add(new RedisNode(host,7001));
        list.add(new RedisNode(host,7002));
        list.add(new RedisNode(host,7003));
        list.add(new RedisNode(host,7004));
        list.add(new RedisNode(host,7005));
        list.add(new RedisNode(host,7006));
        redisClusterConfiguration.setClusterNodes(list);
        return  redisClusterConfiguration;
    }
    
    //配置LettuceConnectionFactory连接工厂
    @Bean
    public LettuceConnectionFactory lettuceConnectionFactory(RedisClusterConfiguration redisClusterConfiguration,LettuceClientConfiguration lettuceClientConfiguration){
        //通过配置RedisClusterConfiguration实例来创建工厂
        //构造该对象是传入Lettuce客户端配置和redis集群配置
        LettuceConnectionFactory lettuceConnectionFactory = new LettuceConnectionFactory(redisClusterConfiguration,lettuceClientConfiguration);
        return lettuceConnectionFactory;
    }
    
    //配置RedisTemplate
    @Bean
    public RedisTemplate<String, Serializable> redisTemplate(LettuceConnectionFactory lettuceConnectionFactory){
        RedisTemplate<String, Serializable> redisTemplate = new RedisTemplate<String, Serializable>();
        //设置key的存储方式为字符串
        redisTemplate.setKeySerializer(new StringRedisSerializer());
        //设置为value的存储方式为JDK二进制序列化方式,还有jackson序列化方式(Jackson2JsonRedisSerialize)
        redisTemplate.setValueSerializer(new JdkSerializationRedisSerializer());
        //注入Lettuce连接工厂
        redisTemplate.setConnectionFactory(lettuceConnectionFactory);
        return redisTemplate;
    }
        
}

四.测试

@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest(classes=App.class)
public class TestSpringBoot {
    
    @Autowired
    private RedisTemplate<String, Serializable> redisTemplate;
    
    
    @Test
    public void test(){
        ValueOperations<String, Serializable> opsForValue = redisTemplate.opsForValue();
                //在这里可以重新设置存储的格式(重新设置为json字符串形式存储)
        //redisTemplate.setValueSerializer(new Jackson2JsonRedisSerializer<>(Object.class));
        User user = new User();
        user.setIdcard("8888");
        user.setUsername("小白");

        //调用opsForValue存储key/value
        opsForValue.set("user", user);

        //查询
        Serializable serializable = opsForValue.get("user");
        System.out.println(serializable.toString());
                
        //删除
        Boolean delete = redisTemplate.delete("user");

        //再次查询
        Serializable res = (User)opsForValue.get("user");
        System.out.println(delete+":"+res );
    }

}

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