基于Lettuce连接Redis单机和集群的客户端代码

SpringBoot 在封装 Lettuce 客户端代码到 spring-boot-starter-data-redis ，核心流程代码如下列举。

连接Redis单机

package com.example.demo.redis;

import io.lettuce.core.RedisClient;
import io.lettuce.core.RedisFuture;
import io.lettuce.core.RedisURI;
import io.lettuce.core.api.StatefulRedisConnection;
import io.lettuce.core.api.async.RedisAsyncCommands;
import io.lettuce.core.api.sync.RedisCommands;
import lombok.extern.slf4j.Slf4j;

import java.time.Duration;
import java.util.concurrent.ExecutionException;

/**
 * 功能描述： 基于 Lettuce 框架连接单机 Redis
 *
 * @author geekziyu
 * @version 1.0.0
 */
@Slf4j
public class LettuceSingle {

    public static void main(String[] args) {
        // 步骤1：连接信息
        RedisURI redisURI = RedisURI.builder()
                .withHost("localhost")
                .withPort(6379)
                // .withPassword(new char[]{'a', 'b', 'c', '1', '2', '3'})
                .withTimeout(Duration.ofSeconds(10))
                .build();

        // 步骤2：创建Redis客户端
        RedisClient client = RedisClient.create(redisURI);

        // 步骤3：建立连接
        StatefulRedisConnection<String, String> connection = client.connect();

        log.info("--------------------同步调用 BEGIN --------------------");
        // 异步转同步
        RedisCommands<String, String> commands = connection.sync();
        // Redis命令：set hello world
        log.info("set hello world");
        String result = commands.set("hello", "world");
        log.info(result);

        log.info("get hello");
        result = commands.get("hello");
        log.info(result);
        log.info("--------------------同步调用 END --------------------");

        log.info("--------------------异步调用 BEGIN --------------------");
        RedisAsyncCommands<String, String> asyncCommands = connection.async();
        log.info("get hello");
        RedisFuture<String> future = asyncCommands.get("hello");

        try {
            result = future.get();
            log.info(result);
        } catch (InterruptedException e) {
            Thread.currentThread().interrupt();
        } catch (ExecutionException e) {
            log.error("执行异常", e);
        }

        log.info("--------------------异步调用 END --------------------");

        connection.close();
        client.shutdown();

    }

}

连接Redis集群

package com.example.demo.redis;

import io.lettuce.core.RedisFuture;
import io.lettuce.core.RedisURI;
import io.lettuce.core.cluster.RedisClusterClient;
import io.lettuce.core.cluster.api.StatefulRedisClusterConnection;
import io.lettuce.core.cluster.api.async.RedisAdvancedClusterAsyncCommands;
import io.lettuce.core.cluster.api.sync.RedisAdvancedClusterCommands;
import lombok.extern.slf4j.Slf4j;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ExecutionException;

/**
 * 功能描述：基于 Lettuce 框架模拟连接 Redis 集群
 *
 * @author geekziyu
 * @version 1.0.0
 */
@Slf4j
public class LettuceCluster {

    public static void main(String[] args) {
        openCluster();
    }

    private static void openCluster() {
        // 步骤1：节点信息
        List<RedisURI> servers = new ArrayList<>();
        servers.add(RedisURI.create("localhost", 6381));
        servers.add(RedisURI.create("localhost", 6382));
        servers.add(RedisURI.create("localhost", 6383));
        servers.add(RedisURI.create("localhost", 6384));
        servers.add(RedisURI.create("localhost", 6385));
        servers.add(RedisURI.create("localhost", 6386));

        // 步骤2：Redis集群客户端
        RedisClusterClient client = RedisClusterClient.create(servers);

        // 步骤3：建立连接
        StatefulRedisClusterConnection<String, String> connection = client.connect();
        log.info("--------------------同步调用 BEGIN --------------------");
        // 异步转同步
        RedisAdvancedClusterCommands<String, String> commands = connection.sync();
        // Redis命令：set hello world
        log.info("set hello world");
        String result = commands.set("hello", "world");
        log.info(result);

        log.info("get hello");
        result = commands.get("hello");
        log.info(result);
        log.info("--------------------同步调用 END --------------------");

        log.info("--------------------异步调用 BEGIN --------------------");
        RedisAdvancedClusterAsyncCommands<String, String> asyncCommands = connection.async();
        log.info("get hello");
        RedisFuture<String> future = asyncCommands.get("hello");

        try {
            result = future.get();
            log.info(result);
        } catch (InterruptedException e) {
            Thread.currentThread().interrupt();
        } catch (ExecutionException e) {
            log.error("执行异常", e);
        }

        log.info("--------------------异步调用 END --------------------");

        connection.close();
        client.shutdown();
    }
}

其他文件

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.5.8</version>
    <relativePath/> <!-- lookup parent from repository -->
  </parent>
  <groupId>com.example.demo.redis</groupId>
  <artifactId>spring-boot-redis-connections</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <name>spring-boot-redis-connections</name>
  <description>Demo project for Spring Boot</description>
  <properties>
    <java.version>1.8</java.version>
    <slf4j.version>1.7.32</slf4j.version>
    <logback.version>1.2.6</logback.version>
  </properties>
  <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.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <optional>true</optional>
    </dependency>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-api</artifactId>
      <version>${slf4j.version}</version>
    </dependency>
    <dependency>
      <groupId>ch.qos.logback</groupId>
      <artifactId>logback-classic</artifactId>
      <version>${logback.version}</version>
    </dependency>

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

  <build>
    <plugins>
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
      </plugin>
    </plugins>
  </build>

</project>

logback.xml

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
  <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
    <encoder>
      <pattern>%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n</pattern>
    </encoder>
  </appender>

  <root level="debug">
    <appender-ref ref="STDOUT"/>
  </root>
</configuration>

简单的get&set

RedisConfig

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.StringRedisSerializer;

@Configuration
public class RedisConfiguration {

  @Bean
  public StringRedisSerializer stringRedisSerializer() {
    return new StringRedisSerializer();
  }

  @Bean
  public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory factory) {
    RedisTemplate<String, Object> result = new RedisTemplate<>();
    result.setConnectionFactory(factory);
    result.setKeySerializer(stringRedisSerializer());
    result.setValueSerializer(stringRedisSerializer());
    result.setHashKeySerializer(stringRedisSerializer());
    result.setHashValueSerializer(stringRedisSerializer());
    return result;
  }

}

AdminController

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;


@RestController
@RequestMapping("/admin")
public class AdminController {

  @Autowired
  private RedisTemplate<String, Object> redisTemplate;

  @GetMapping("/get")
  public String get(String key) {
    Object result = redisTemplate.opsForValue().get(key);
    return String.valueOf(result);
  }

  @GetMapping("/set")
  public String set(String key, String value) {
    redisTemplate.opsForValue().set(key, value);
    return "ok";
  }
}

application.properties

spring.redis.host=localhost
spring.redis.port=6379

#spring.redis.url=redis://user:password@example.com:6379
#spring.redis.sentinel.master=localhost:26379
#spring.redis.sentinel.nodes=localhost:26379,localhost:26380,localhost:26381

#spring.redis.cluster.nodes=localhost:6381,localhost:6382,localhost:6383,localhost:6384,localhost:6385,localhost:6386
#spring.redis.password=abc123