Redis7--基础篇9（SpringBoot集成Redis）

1. jedis、lettuce、Redistemplate的关系

第一代为jedis，之后推出了lettuce，然后springboot继承了Redistemplate，现推荐使用Redistemplate。
总的来说，jedis、lettuce、Redistemplate都是java操作Redis数据库的驱动。

2. 本地Java连接Redis常见问题

• bind配置注释掉
• 保护模式设置为no
• Linux系统防火墙关掉
• Redis服务器 ip 端口 密码是否正确

3. jedis

Jedis Client是Redis官网推荐的一个面向java客户端，库文件实现了对各类API进行封装调用。

3.1 建module

3.2 改pom

<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>4.0.0modelVersion>

    <groupId>com.atguigu.redis7groupId>
    <artifactId>redis7_studyartifactId>
    <version>1.0-SNAPSHOTversion>

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

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

    <dependencies>
        
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-webartifactId>
        dependency>
        
        <dependency>
            <groupId>redis.clientsgroupId>
            <artifactId>jedisartifactId>
            <version>4.3.1version>
        dependency>
        
        <dependency>
            <groupId>junitgroupId>
            <artifactId>junitartifactId>
            <version>${junit.version}version>
        dependency>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-testartifactId>
            <scope>testscope>
        dependency>
        <dependency>
            <groupId>log4jgroupId>
            <artifactId>log4jartifactId>
            <version>${log4j.version}version>
        dependency>
        <dependency>
            <groupId>org.projectlombokgroupId>
            <artifactId>lombokartifactId>
            <version>${lombok.version}version>
            <optional>trueoptional>
        dependency>
    dependencies>

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

project>

3.3 写yml

server.port=7777
spring.application.name=redis7_study

3.4 主启动

package com.atguigu.redis7;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

/**
 * @auther zzyy
 * @create 2022-11-17 16:36
 */
@SpringBootApplication
public class Redis7Study7777
{
    public static void main(String[] args)
    {
        SpringApplication.run(Redis7Study7777.class,args);
    }
}

3.5 业务类

Demo

@Slf4j
public class JedisDemo
{
    public static void main(String[] args)
    {
        Jedis jedis = new Jedis("192.168.111.185",6379);

        jedis.auth("111111");

        log.info("redis conn status:{}","连接成功");
        log.info("redis ping retvalue:{}",jedis.ping());

        jedis.set("k1","jedis");
        log.info("k1 value:{}",jedis.get("k1"));
    }
}

package com.atguigu.redis7.test;

import redis.clients.jedis.Jedis;

import java.util.*;

/**
 * @auther zzyy
 * @create 2022-11-17 16:39
 */
public class JedisDemo
{
    public static void main(String[] args)
    {
        //连接本地的 Redis 服务，自己的ip和端口和密码
        Jedis jedis = new Jedis("192.168.111.181",6379);
        // 如果 Redis 服务设置了密码，需要下面这行，没有就不需要
        jedis.auth("111111");

        //key
        Set<String> keys = jedis.keys("*");
        for (Iterator iterator = keys.iterator(); iterator.hasNext();) {
            String key = (String) iterator.next();
            System.out.println(key);
        }
        System.out.println("jedis.exists====>"+jedis.exists("k2"));
        System.out.println(jedis.ttl("k1"));
        //String
        //jedis.append("k1","myreids");
        System.out.println(jedis.get("k1"));
        jedis.set("k4","k4_redis");
        System.out.println("----------------------------------------");
        jedis.mset("str1","v1","str2","v2","str3","v3");
        System.out.println(jedis.mget("str1","str2","str3"));
        //list
        System.out.println("----------------------------------------");
        //jedis.lpush("mylist","v1","v2","v3","v4","v5");
        List<String> list = jedis.lrange("mylist",0,-1);
        for (String element : list) {
            System.out.println(element);
        }
        //set
        jedis.sadd("orders","jd001");
        jedis.sadd("orders","jd002");
        jedis.sadd("orders","jd003");
        Set<String> set1 = jedis.smembers("orders");
        for (Iterator iterator = set1.iterator(); iterator.hasNext();) {
            String string = (String) iterator.next();
            System.out.println(string);
        }
        jedis.srem("orders","jd002");
        System.out.println(jedis.smembers("orders").size());
        //hash
        jedis.hset("hash1","userName","lisi");
        System.out.println(jedis.hget("hash1","userName"));
        Map<String,String> map = new HashMap<String,String>();
        map.put("telphone","138xxxxxxxx");
        map.put("address","atguigu");
        map.put("email","[email protected]");//课后有问题请给我发邮件
        jedis.hmset("hash2",map);
        List<String> result = jedis.hmget("hash2", "telphone","email");
        for (String element : result) {
            System.out.println(element);
        }

        //zset
        jedis.zadd("zset01",60d,"v1");
        jedis.zadd("zset01",70d,"v2");
        jedis.zadd("zset01",80d,"v3");
        jedis.zadd("zset01",90d,"v4");

        List<String> zset01 = jedis.zrange("zset01", 0, -1);
        zset01.forEach(System.out::println);
    }
}

4. lettuce

4.1 Jedis和Lettuce的区别

jedis和Lettuce都是Redis的客户端，它们都可以连接Redis服务器，但是在SpringBoot2.0之后默认都是使用的Lettuce这个客户端连接Redis服务器。因为当使用Jedis客户端连接Redis服务器的时候，每个线程都要拿自己创建的Jedis实例去连接Redis客户端，当有很多个线程的时候，不仅开销大需要反复的创建关闭一个Jedis连接，而且也是线程不安全的，一个线程通过Jedis实例更改Redis服务器中的数据之后会影响另一个线程；
但是如果使用Lettuce这个客户端连接Redis服务器的时候，就不会出现上面的情况，Lettuce底层使用的是Netty，当有多个线程都需要连接Redis服务器的时候，可以保证只创建一个Lettuce连接，使所有的线程共享这一个Lettuce连接，这样可以减少创建关闭一个Lettuce连接时候的开销：而且这种方式也是线程安全的，不会出现一个线程通过Lettuce更改Redis服务器中的数据之后而影响另一个线程的情况;

4.2 改pom

<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>4.0.0modelVersion>

    <groupId>com.atguigu.redis7groupId>
    <artifactId>redis7_studyartifactId>
    <version>1.0-SNAPSHOTversion>

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

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

    <dependencies>
        
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-webartifactId>
        dependency>
        
        <dependency>
            <groupId>redis.clientsgroupId>
            <artifactId>jedisartifactId>
            <version>4.3.1version>
        dependency>
        
        <dependency>
            <groupId>io.lettucegroupId>
            <artifactId>lettuce-coreartifactId>
            <version>6.2.1.RELEASEversion>
        dependency>
        
        <dependency>
            <groupId>junitgroupId>
            <artifactId>junitartifactId>
            <version>${junit.version}version>
        dependency>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-testartifactId>
            <scope>testscope>
        dependency>
        <dependency>
            <groupId>log4jgroupId>
            <artifactId>log4jartifactId>
            <version>${log4j.version}version>
        dependency>
        <dependency>
            <groupId>org.projectlombokgroupId>
            <artifactId>lombokartifactId>
            <version>${lombok.version}version>
            <optional>trueoptional>
        dependency>
    dependencies>

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

project>

4.3 业务类

package com.atguigu.redis7.test;

import io.lettuce.core.RedisClient;
import io.lettuce.core.RedisFuture;
import io.lettuce.core.RedisURI;
import io.lettuce.core.SortArgs;
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.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ExecutionException;

/**
 * @auther zzyy
 * @create 2022-11-17 17:05
 */
@Slf4j
public class LettuceDemo
{
    public static void main(String[] args)
    {
        //使用构建器 RedisURI.builder
        RedisURI uri = RedisURI.builder()
                .redis("192.168.111.181")
                .withPort(6379)
                .withAuthentication("default","111111")
                .build();
        //创建连接客户端
        RedisClient client = RedisClient.create(uri);
        StatefulRedisConnection conn = client.connect();
        //操作命令api
        RedisCommands<String,String> commands = conn.sync();

        //keys
        List<String> list = commands.keys("*");
        for(String s : list) {
            log.info("key:{}",s);
        }
        //String
    commands.set("k1","1111");
    String s1 = commands.get("k1");
    System.out.println("String s ==="+s1);

        //list
    commands.lpush("myList2", "v1","v2","v3");
    List<String> list2 = commands.lrange("myList2", 0, -1);
    for(String s : list2) {
     System.out.println("list ssss==="+s);
    }
    //set
    commands.sadd("mySet2", "v1","v2","v3");
    Set<String> set = commands.smembers("mySet2");
    for(String s : set) {
     System.out.println("set ssss==="+s);
    }
    //hash
    Map<String,String> map = new HashMap<>();
        map.put("k1","138xxxxxxxx");
        map.put("k2","atguigu");
        map.put("k3","[email protected]");//课后有问题请给我发邮件

    commands.hmset("myHash2", map);
    Map<String,String> retMap = commands.hgetall("myHash2");
    for(String k : retMap.keySet()) {
     System.out.println("hash  k="+k+" , v=="+retMap.get(k));
    }

    //zset
    commands.zadd("myZset2", 100.0,"s1",110.0,"s2",90.0,"s3");
    List<String> list3 = commands.zrange("myZset2",0,10);
    for(String s : list3) {
     System.out.println("zset ssss==="+s);
    }

    //sort
    SortArgs sortArgs = new SortArgs();
    sortArgs.alpha();
    sortArgs.desc();

    List<String> list4 = commands.sort("myList2",sortArgs);
    for(String s : list4) {
     System.out.println("sort ssss==="+s);
    }

        //关闭
        conn.close();
        client.shutdown();
    }
}

5. Redistemplate 单机

5.1 建module

redis_study

5.2 改pom

<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>4.0.0modelVersion>

    <groupId>com.atguigu.redis7groupId>
    <artifactId>redis7_studyartifactId>
    <version>1.0-SNAPSHOTversion>

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

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


    <dependencies>
        
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-webartifactId>
        dependency>
        
        <dependency>
            <groupId>redis.clientsgroupId>
            <artifactId>jedisartifactId>
            <version>4.3.1version>
        dependency>
        
        <dependency>
            <groupId>io.lettucegroupId>
            <artifactId>lettuce-coreartifactId>
            <version>6.2.1.RELEASEversion>
        dependency>
        
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-data-redisartifactId>
        dependency>
        <dependency>
            <groupId>org.apache.commonsgroupId>
            <artifactId>commons-pool2artifactId>
        dependency>
        
        <dependency>
            <groupId>io.springfoxgroupId>
            <artifactId>springfox-swagger2artifactId>
            <version>2.9.2version>
        dependency>
        <dependency>
            <groupId>io.springfoxgroupId>
            <artifactId>springfox-swagger-uiartifactId>
            <version>2.9.2version>
        dependency>
        
        <dependency>
            <groupId>junitgroupId>
            <artifactId>junitartifactId>
            <version>${junit.version}version>
        dependency>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-testartifactId>
            <scope>testscope>
        dependency>
        <dependency>
            <groupId>log4jgroupId>
            <artifactId>log4jartifactId>
            <version>${log4j.version}version>
        dependency>
        <dependency>
            <groupId>org.projectlombokgroupId>
            <artifactId>lombokartifactId>
            <version>${lombok.version}version>
            <optional>trueoptional>
        dependency>
    dependencies>

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

project>

5.3 写yml

server.port=7777

spring.application.name=redis7_study

# ========================logging=====================
logging.level.root=info
logging.level.com.atguigu.redis7=info
logging.pattern.console=%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger- %msg%n 

logging.file.name=D:/mylogs2023/redis7_study.log
logging.pattern.file=%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger- %msg%n

# ========================swagger=====================
spring.swagger2.enabled=true
#在springboot2.6.X结合swagger2.9.X会提示documentationPluginsBootstrapper空指针异常，
#原因是在springboot2.6.X中将SpringMVC默认路径匹配策略从AntPathMatcher更改为PathPatternParser，
# 导致出错，解决办法是matching-strategy切换回之前ant_path_matcher
spring.mvc.pathmatch.matching-strategy=ant_path_matcher

# ========================redis单机=====================
spring.redis.database=0
# 修改为自己真实IP
spring.redis.host=192.168.111.185
spring.redis.port=6379
spring.redis.password=111111
spring.redis.lettuce.pool.max-active=8
spring.redis.lettuce.pool.max-wait=-1ms
spring.redis.lettuce.pool.max-idle=8
spring.redis.lettuce.pool.min-idle=0

5.4 主启动

package com.atguigu.redis7;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

/**
 * @auther zzyy
 * @create 2022-11-17 16:36
 */
@SpringBootApplication
public class Redis7Study7777
{
    public static void main(String[] args)
    {
        SpringApplication.run(Redis7Study7777.class,args);
    }
}

5.5 业务类

RedisConfig

package com.atguigu.redis7.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;

/**
 * @auther zzyy
 * @create 2022-11-17 17:34
 */
@Configuration
public class RedisConfig
{
    /**
     * redis序列化的工具配置类，下面这个请一定开启配置
     * 127.0.0.1:6379> keys *
     * 1) "ord:102"  序列化过
     * 2) "\xac\xed\x00\x05t\x00\aord:102"   野生，没有序列化过
     * this.redisTemplate.opsForValue(); //提供了操作string类型的所有方法
     * this.redisTemplate.opsForList(); // 提供了操作list类型的所有方法
     * this.redisTemplate.opsForSet(); //提供了操作set的所有方法
     * this.redisTemplate.opsForHash(); //提供了操作hash表的所有方法
     * this.redisTemplate.opsForZSet(); //提供了操作zset的所有方法
     * @param lettuceConnectionFactory
     * @return
     */
    @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;
    }
}

SwaggerConfig

package com.atguigu.redis7.config;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import springfox.documentation.builders.ApiInfoBuilder;
import springfox.documentation.builders.PathSelectors;
import springfox.documentation.builders.RequestHandlerSelectors;
import springfox.documentation.service.ApiInfo;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2;

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

/**
 * @auther zzyy
 * @create 2022-11-17 17:44
 */
@Configuration
@EnableSwagger2
public class SwaggerConfig
{
    @Value("${spring.swagger2.enabled}")
    private Boolean enabled;

    @Bean
    public Docket createRestApi() {
        return new Docket(DocumentationType.SWAGGER_2)
                .apiInfo(apiInfo())
                .enable(enabled)
                .select()
                .apis(RequestHandlerSelectors.basePackage("com.atguigu.redis7")) //你自己的package
                .paths(PathSelectors.any())
                .build();
    }
    public ApiInfo apiInfo() {
        return new ApiInfoBuilder()
                .title("springboot利用swagger2构建api接口文档 "+"\t"+ DateTimeFormatter.ofPattern("yyyy-MM-dd").format(LocalDateTime.now()))
                .description("springboot+redis整合,有问题给管理员阳哥邮件:[email protected]")
                .version("1.0")
                .termsOfServiceUrl("https://www.atguigu.com/")
                .build();
    }
}

service

package com.atguigu.redis7.service;

import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.util.UUID;
import java.util.concurrent.ThreadLocalRandom;

/**
 * @auther zzyy
 * @create 2022-07-14 15:11
 */
@Service
@Slf4j
public class OrderService
{
    public static final String ORDER_KEY = "order:";

    @Resource
    private RedisTemplate<String,Object> 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);
        log.info("=====>编号"+keyId+"的订单流水生成:{}",orderNo);
    }

    public String getOrderById(Integer id)
    {
        return (String)redisTemplate.opsForValue().get(ORDER_KEY + id);
    }
}

controller

package com.atguigu.redis7.controller;

import com.atguigu.redis7.service.OrderService;

import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;
import java.util.concurrent.ThreadLocalRandom;

/**
 * @auther zzyy
 * @create 2022-07-14 15:08
 */
@Api(tags = "订单接口")
@RestController
@Slf4j
public class OrderController
{
    @Resource
    private OrderService orderService;

    @ApiOperation("新增订单")
    @RequestMapping(value = "/order/add",method = RequestMethod.POST)
    public void addOrder()
    {
        orderService.addOrder();
    }


    @ApiOperation("按orderId查订单信息")
    @RequestMapping(value = "/order/{id}", method = RequestMethod.GET)
    public String findUserById(@PathVariable Integer id)
    {
        return orderService.getOrderById(id);
    }
}

5.6 测试

http://localhost:7777/swagger-ui.html#/

中文序列化问题
JDK 序列化方式 （默认）
org.springframework.data.redis.serializer.JdkSerializationRedisSerializer ，
默认情况下，RedisTemplate 使用该数据列化方式，我们来看下源码 RedisTemplate#afterPropertiesSet()

6. Redistemplate 集群

改写yml

server.port=7777

spring.application.name=redis7_study

# ========================logging=====================
logging.level.root=info
logging.level.com.atguigu.redis7=info
logging.pattern.console=%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger- %msg%n 

logging.file.name=D:/mylogs2023/redis7_study.log
logging.pattern.file=%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger- %msg%n

# ========================swagger=====================
spring.swagger2.enabled=true
#在springboot2.6.X结合swagger2.9.X会提示documentationPluginsBootstrapper空指针异常，
#原因是在springboot2.6.X中将SpringMVC默认路径匹配策略从AntPathMatcher更改为PathPatternParser，
# 导致出错，解决办法是matching-strategy切换回之前ant_path_matcher
spring.mvc.pathmatch.matching-strategy=ant_path_matcher


# ========================redis集群=====================
spring.redis.password=111111
# 获取失败 最大重定向次数
spring.redis.cluster.max-redirects=3
spring.redis.lettuce.pool.max-active=8
spring.redis.lettuce.pool.max-wait=-1ms
spring.redis.lettuce.pool.max-idle=8
spring.redis.lettuce.pool.min-idle=0
spring.redis.cluster.nodes=192.168.111.175:6381,192.168.111.175:6382,192.168.111.172:6383,192.168.111.172:6384,192.168.111.174:6385,192.168.111.174:6386

模拟某台主机down掉，手动shutdown后会出现的问题

【故障演练】 Redis Cluster集群部署采用了3主3从拓扑结构，数据读写访问master节点， slave节点负责备份。当master宕机主从切换成功，redis手动OK，but 2个经典故障

如何解决

再次改写yml

server.port=7777

spring.application.name=redis7_study

# ========================logging=====================
logging.level.root=info
logging.level.com.atguigu.redis7=info
logging.pattern.console=%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger- %msg%n 

logging.file.name=D:/mylogs2023/redis7_study.log
logging.pattern.file=%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger- %msg%n

# ========================swagger=====================
spring.swagger2.enabled=true
#在springboot2.6.X结合swagger2.9.X会提示documentationPluginsBootstrapper空指针异常，
#原因是在springboot2.6.X中将SpringMVC默认路径匹配策略从AntPathMatcher更改为PathPatternParser，
# 导致出错，解决办法是matching-strategy切换回之前ant_path_matcher
spring.mvc.pathmatch.matching-strategy=ant_path_matcher


# ========================redis集群=====================
spring.redis.password=111111
# 获取失败 最大重定向次数
spring.redis.cluster.max-redirects=3
spring.redis.lettuce.pool.max-active=8
spring.redis.lettuce.pool.max-wait=-1ms
spring.redis.lettuce.pool.max-idle=8
spring.redis.lettuce.pool.min-idle=0
#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
spring.redis.lettuce.cluster.refresh.adaptive=true
#定时刷新
spring.redis.lettuce.cluster.refresh.period=2000
spring.redis.cluster.nodes=192.168.111.175:6381,192.168.111.175:6382,192.168.111.172:6383,192.168.111.172:6384,192.168.111.174:6385,192.168.111.174:6386