• 我们都会通过案例来演示如何 “食用”

一、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
• 我们需要创建一个 SpringBoot 的项目来连接到虚拟机的 Redis 上

1️⃣ 主启动类：

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);}
}

2️⃣ 核心配置文件：

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

3️⃣ pom.xml 配置文件：

<?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><!--jedis--><dependency><groupId>redis.clients</groupId><artifactId>jedis</artifactId><version>4.3.1</version></dependency><!--通用基础配置--><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>${junit.version}</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><dependency><groupId>log4j</groupId><artifactId>log4j</artifactId><version>${log4j.version}</version></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>

我们将连接Redis的代码直接写道了主方法中

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");//keySet<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"));//listSystem.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);}//setjedis.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());//hashjedis.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","zzyybs@126.com");//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);}//zsetjedis.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);}
}

二、Lettuce

• Lettuce 是一个 Redis 的 Java 驱动包,可以理解为 Jedis 的升级版
  

1️⃣ 在配置文件引入我们的lettuce

<?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><!--jedis--><dependency><groupId>redis.clients</groupId><artifactId>jedis</artifactId><version>4.3.1</version></dependency><!--lettuce--><dependency><groupId>io.lettuce</groupId><artifactId>lettuce-core</artifactId><version>6.2.1.RELEASE</version></dependency><!--通用基础配置--><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>${junit.version}</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><dependency><groupId>log4j</groupId><artifactId>log4j</artifactId><version>${log4j.version}</version></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>

2️⃣ 编写业务类

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.builderRedisURI 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apiRedisCommands<String,String> commands = conn.sync();//keysList<String> list = commands.keys("*");for(String s : list) {log.info("key:{}",s);}//Stringcommands.set("k1","1111");String s1 = commands.get("k1");System.out.println("String s ==="+s1);//listcommands.lpush("myList2", "v1","v2","v3");List<String> list2 = commands.lrange("myList2", 0, -1);for(String s : list2) {System.out.println("list ssss==="+s);}//setcommands.sadd("mySet2", "v1","v2","v3");Set<String> set = commands.smembers("mySet2");for(String s : set) {System.out.println("set ssss==="+s);}//hashMap<String,String> map = new HashMap<>();map.put("k1","138xxxxxxxx");map.put("k2","atguigu");map.put("k3","zzyybs@126.com");//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));}//zsetcommands.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);}//sortSortArgs 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();}
}

三、RedisTemplate

• 是 SpringBoot 访问 Redis 的核心组件，底层通过 RedisConnectionFactory 对多种 Redis 驱动进行集成
• 对于在 SpringBoot 中连接 Redis 我们当前主要采用的也是这种方式

1. 连接单机

• 创建一个module，接下来给出参考的文件

1️⃣ 主启动类

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);}
}

2️⃣ 核心配置文件：

server.port=7777spring.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

3️⃣ pom 配置文件：

<?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><!--jedis--><dependency><groupId>redis.clients</groupId><artifactId>jedis</artifactId><version>4.3.1</version></dependency><!--lettuce--><dependency><groupId>io.lettuce</groupId><artifactId>lettuce-core</artifactId><version>6.2.1.RELEASE</version></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><!--swagger2--><dependency><groupId>io.springfox</groupId><artifactId>springfox-swagger2</artifactId><version>2.9.2</version></dependency><dependency><groupId>io.springfox</groupId><artifactId>springfox-swagger-ui</artifactId><version>2.9.2</version></dependency><!--通用基础配置junit/devtools/test/log4j/lombok/hutool--><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>${junit.version}</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><dependency><groupId>log4j</groupId><artifactId>log4j</artifactId><version>${log4j.version}</version></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>

4️⃣ 配置类：

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*/@Beanpublic RedisTemplate<String, Object> redisTemplate(LettuceConnectionFactory lettuceConnectionFactory){RedisTemplate<String,Object> redisTemplate = new RedisTemplate<>();redisTemplate.setConnectionFactory(lettuceConnectionFactory);//设置key序列化方式stringredisTemplate.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;@Beanpublic 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:zzyybs@126.com").version("1.0").termsOfServiceUrl("https://www.atguigu.com/").build();}
}

servie

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:";@Resourceprivate 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);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
{@Resourceprivate 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);}
}

5️⃣ 测试：

• 我们使用 http://localhost:7777/swagger-ui.html# 来发起测试请求
• 存储元素后获取的时候，可能会出现序列化问题

• 具体原因就是使用了默认的序列化方式
  
  
• 使用CentOS的命令行获取数据中文乱码，只需要我们在启用客户端的时候添加 --raw 选项

2. 连接集群

• 首先启动我们之前配置的六台 Redis 实例客户端
• 因为是集群，所以需要我们在 yaml 文件中进行配置

server.port=7777spring.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

• 通过 Swagger 测试我们的集群是否能正常使用？

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

• 我们要通过 shutdown 来模拟 master 宕机的情况

  • 我们让 6831 宕机，然后看 6834 是否会上位
  • Redis Cluster集群能自动感知并自动完成主备切换，对应的slave6384会被选举为新的master节点
  • 在虚拟机中测试发现，是可以的

• 但是我们通过 Swagger 测试的时候，不会自动感知到我们集群的拓扑结构已经发生变化了，所以就会产生错误
  

• 出现这种现象的解释：SpringBoot2.X版本，Redis默认的连接池采用Lettuce当Redis集群节点发生变化后，Letture默认是不会刷新节点拓扑

• 我们可以有三种解决方案，不过只推荐使用第三种方案：

1️⃣ 方案一：

• 我们取消 Redis 场景里面导入的 Lettuce，而是配置个 Jedis 来代替这部分的功能
  
  2️⃣ 方案二：

• 我们可以重写连接工厂

//仅做参考，不写，不写，不写。@Beanpublic DefaultClientResources lettuceClientResources() {return DefaultClientResources.create();}@Beanpublic LettuceConnectionFactory lettuceConnectionFactory(RedisProperties redisProperties, ClientResources clientResources) {ClusterTopologyRefreshOptions topologyRefreshOptions = ClusterTopologyRefreshOptions.builder().enablePeriodicRefresh(Duration.ofSeconds(30)) //按照周期刷新拓扑.enableAllAdaptiveRefreshTriggers() //根据事件刷新拓扑.build();ClusterClientOptions clusterClientOptions = ClusterClientOptions.builder()//redis命令超时时间,超时后才会使用新的拓扑信息重新建立连接.timeoutOptions(TimeoutOptions.enabled(Duration.ofSeconds(10))).topologyRefreshOptions(topologyRefreshOptions).build();LettuceClientConfiguration clientConfiguration = LettuceClientConfiguration.builder().clientResources(clientResources).clientOptions(clusterClientOptions).build();RedisClusterConfiguration clusterConfig = new RedisClusterConfiguration(redisProperties.getCluster().getNodes());clusterConfig.setMaxRedirects(redisProperties.getCluster().getMaxRedirects());clusterConfig.setPassword(RedisPassword.of(redisProperties.getPassword()));LettuceConnectionFactory lettuceConnectionFactory = new LettuceConnectionFactory(clusterConfig, clientConfiguration);return lettuceConnectionFactory;}

3️⃣ 方案三：刷新结点集群动态拓扑感应

• 只需要我们在配置文件中添加下面两条配置：

#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