Spring Boot连接Redis集群

1、问题写在前面

1.1、问题描述：Redis集群节点地址发现失败

Unable to connect to [172.17.0.4:7303]: connection timed out: /172.17.0.4:7303

1.2、解决方案：

redis.conf 中添加配置 cluster-announce-ip 192.168.56.11

1.3、方案出处：官网

redis.conf

在Docker等容器中部署时，Redis集群节点地址发现失败，因为地址是NAT-ted或因为端口被转发。为了让Redis Cluster在这样的环境中正常工作，需要一个静态配置让每个节点都知道其公网地址

2、Spring Boot 连接 Redis 集群实践

实践 Demo 源码

2.1 、文件结构

文件树

├─java
│  └─com
│      └─yeswater
│          └─redis7
│              │  RedisMain7777.java
│              │
│              ├─config
│              │      RedisConfig.java
│              │
│              ├─controller
│              │      OrderController.java
│              │
│              └─service
│                      OrderService.java
│
└─resources
        application.yml

2.2、演示

set

console

get

2.3、代码

RedisMain7777.java

java 复制代码

@SpringBootApplication
public class RedisMain7777 {
	public static void main(String[] args) {
		SpringApplication.run(RedisMain7777.class, args);
	}
}

RedisConfig

java 复制代码

@Configuration
public class RedisConfig {

	@Bean
	public RedisTemplate<String, Object> redisTemplate(LettuceConnectionFactory lettuceConnectionFactory)
	{
		RedisTemplate<String,Object> redisTemplate = new RedisTemplate<>();
		
		redisTemplate.setConnectionFactory(lettuceConnectionFactory);
		//设置key序列化方式string
		redisTemplate.setKeySerializer(new StringRedisSerializer());
		//设置value的序列化方式json，使用GenericJackson2JsonRedisSerializer替换默认序列化
		redisTemplate.setValueSerializer(new GenericJackson2JsonRedisSerializer());
		
		redisTemplate.setHashKeySerializer(new StringRedisSerializer());
		redisTemplate.setHashValueSerializer(new GenericJackson2JsonRedisSerializer());
		
		redisTemplate.afterPropertiesSet();
		
		return redisTemplate;
	}
}

OrderController

java 复制代码

@RestController
public class OrderController
{
	@Resource
	private OrderService orderService;
	
	@RequestMapping(value = "/order/add",method = RequestMethod.POST)
	public void addOrder()
	{
		orderService.addOrder();
	}
	
	@RequestMapping(value = "/order/{id}", method = RequestMethod.GET)
	public String findUserById(@PathVariable Integer id)
	{
		return orderService.getOrderById(id);
	}
}

OrderSerive

java 复制代码

@Service
public class OrderService
{
	public static final String ORDER_KEY = "order:";
	
	@Resource
	private RedisTemplate redisTemplate;
	
	public void addOrder()
	{
		int keyId = ThreadLocalRandom.current().nextInt(1000)+1;
		String orderNo = UUID.randomUUID().toString();
		redisTemplate.opsForValue().set(ORDER_KEY+keyId,"京东订单"+ orderNo);
		System.out.println(("=====>编号" + keyId + "的订单流水生成:" + orderNo));
	}
	
	public String getOrderById(Integer id)
	{
		return (String)redisTemplate.opsForValue().get(ORDER_KEY + id);
	}
}

application.yml

yml 复制代码

server:
  port: 7777

spring:
  application:
    name: redis7_study
  redis:
    password: 111111
    database: 0
    lettuce:
      pool:
        max-active: 8   # 连接池最大连接数默认值为8 
        max-wait: -1ms  # 连接池最大阻塞时间（使用负值表示没有限制）默认值为-1
        max-idle: 8     # 连接池中最大空闲连接数默认值为8
        min-idle: 0     # 连接池中的最小空闲连接数，默认值为0
      cluster:
        # 感知集群的主从切换
        refresh:
          adaptive: true    #支持集群拓扑动态感应刷新,自适应拓扑刷新是否使用所有可用的更新，默认false关闭
          period: 2000      #定时刷新
    cluster:
      nodes: 
        - 192.168.56.11:7306 # cluster-announce-ip 192.168.56.11:7306
        - 192.168.56.11:7305
        - 192.168.56.11:7304
        - 192.168.56.11:7303
        - 192.168.56.11:7302
        - 192.168.56.11:7301
      max-redirects: 3

pom.xml

xml 复制代码

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.atguigu.redis7</groupId>
    <artifactId>redis7_study</artifactId>
    <version>1.0-SNAPSHOT</version>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.6.10</version>
        <relativePath/>
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <junit.version>4.12</junit.version>
        <log4j.version>1.2.17</log4j.version>
        <lombok.version>1.16.18</lombok.version>
    </properties>


    <dependencies>
        <!--SpringBoot通用依赖模块-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        
        <!--SpringBoot与Redis整合依赖-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-pool2</artifactId>
        </dependency>
        
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>${lombok.version}</version>
            <optional>true</optional>
        </dependency>
    </dependencies>

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

</project>