下面以当天，即 2023.02.13 来说明

spring-boot-starter-redis

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-redis</artifactId>
    <version>1.4.7.RELEASE</version>
</dependency>

Starter for using Redis key-value data store with Spring Data Redis and the Jedis client. Deprecated as of 1.4 in favor of spring-boot-starter-data-redis

由 apache 官网仓库可以得知最后更新日期为 2017年，并且 pom 的 description 上标明使用 spring-boot-starter-data-redis替换 ，此依赖已过期。

spring-boot-starter-data-redis

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-redis</artifactId>
    <version>2.6.9</version>
</dependency>

Starter for using Redis key-value data store with Spring Data Redis and the Lettuce client

由 apache 官网仓库可以得知最后更新日期为 2023年。

spring-boot-starter-data-redis-reactive

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-redis-reactive</artifactId>
    <version>2.6.9</version>
</dependency>

Starter for using Redis key-value data store with Spring Data Redis reactive and the Lettuce client

由此介绍可以得知，通过 reactive 方式访问 redis。

RedisTemplate 实现了接口 RedisOperations

ReactiveRedisTemplate 实现了接口 ReactiveRedisOperations，ReactiveRedisOperations 中引入了 reactor 相关的类。

由 apache 官网仓库可以得知最后更新日期为 2023年。

查看 pom.xml 文件

<?xml version="1.0" encoding="UTF-8"?>
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <!-- This module was also published with a richer model, Gradle metadata,  -->
  <!-- which should be used instead. Do not delete the following line which  -->
  <!-- is to indicate to Gradle or any Gradle module metadata file consumer  -->
  <!-- that they should prefer consuming it instead. -->
  <!-- do_not_remove: published-with-gradle-metadata -->
  <modelVersion>4.0.0</modelVersion>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-data-redis-reactive</artifactId>
  <version>2.6.9</version>
  <name>spring-boot-starter-data-redis-reactive</name>
  <description>Starter for using Redis key-value data store with Spring Data Redis reactive and the Lettuce client</description>
  <url>https://spring.io/projects/spring-boot</url>
  <organization>
    <name>Pivotal Software, Inc.</name>
    <url>https://spring.io</url>
  </organization>
  <licenses>
    <license>
      <name>Apache License, Version 2.0</name>
      <url>https://www.apache.org/licenses/LICENSE-2.0</url>
    </license>
  </licenses>
  <developers>
    <developer>
      <name>Pivotal</name>
      <email>info@pivotal.io</email>
      <organization>Pivotal Software, Inc.</organization>
      <organizationUrl>https://www.spring.io</organizationUrl>
    </developer>
  </developers>
  <scm>
    <connection>scm:git:git://github.com/spring-projects/spring-boot.git</connection>
    <developerConnection>scm:git:ssh://git@github.com/spring-projects/spring-boot.git</developerConnection>
    <url>https://github.com/spring-projects/spring-boot</url>
  </scm>
  <issueManagement>
    <system>GitHub</system>
    <url>https://github.com/spring-projects/spring-boot/issues</url>
  </issueManagement>
  <dependencies>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-data-redis</artifactId>
      <version>2.6.9</version>
      <scope>compile</scope>
    </dependency>
  </dependencies>
</project>

得知引用了 spring-boot-starter-data-redis，由此得知 spring-boot-starter-data-redis-reactive 和

spring-boot-starter-data-redis 是指一个。