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，核心流程代码见本文正文。
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
