【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）@Beanpublic 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@Beanpublic 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@Beanpublic 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 {@Autowiredprivate RedisTemplate<String, Serializable> redisTemplate;@Testpublic 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/valueopsForValue.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 );}}