对于刚接触Spring boot data-redis 的同学，与jedis的关系很容易搞混，这里对data-redis于jedis做一个简单的说明，并提供整合方式

1. 区别与关系

• jedis

jedis是redis的java客户端，通过它可以对redis进行操作。与之功能相似的还包括：Lettuce等

• spring-data-redis

它依赖jedis或Lettuce，实际上是对jedis这些客户端的封装，提供一套与客户端无关的api供应用使用，从而你在从一个redis客户端切换为另一个客户端，不需要修改业务代码。

2. spring boot 整合data redis （默认依赖Lettuce）

spring-boot-data-redis 内部实现了对Lettuce和jedis两个客户端的封装，默认使用的是Lettuce

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

    <groupId>com.heichong</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>demo</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

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

• application.yml

spring:
  redis:
    database: 0
    host: 192.168.1.191
    port: 6379

• SimpleService redis测试类

package com.heichong.demo.redis;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;


@Service
public class SimpleService {
    static Logger logger = LoggerFactory.getLogger(SimpleService.class) ;

    @Autowired
    StringRedisTemplate stringRedisTemplate ;

    public void run(){
        logger.info("redis连接工厂：{}",stringRedisTemplate.getConnectionFactory());

        //添加key
        stringRedisTemplate.opsForValue().set("user","张三");
        //获取key
        logger.info("从redis中获取key=user的值为：{}",stringRedisTemplate.opsForValue().get("user"));

        //删除key
        stringRedisTemplate.delete("user");

    }
}

• DemoApplication 启动类

package com.heichong.demo;

import com.heichong.demo.redis.SimpleService;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ApplicationContext;

@SpringBootApplication
public class DemoApplication {

    public static void main(String[] args) {
        ApplicationContext ctx = SpringApplication.run(DemoApplication.class, args);

        SimpleService simpleService = ctx.getBean(SimpleService.class) ;
        simpleService.run();
    }
}

• 运行日志如下

2018-08-09 09:24:14.726  INFO 7108 --- [           main] com.heichong.demo.redis.SimpleService    : redis连接工厂：org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory@62417a16
2018-08-09 09:24:14.839  INFO 7108 --- [           main] io.lettuce.core.EpollProvider            : Starting without optional epoll library
2018-08-09 09:24:14.840  INFO 7108 --- [           main] io.lettuce.core.KqueueProvider           : Starting without optional kqueue library
2018-08-09 09:24:14.955  INFO 7108 --- [           main] com.heichong.demo.redis.SimpleService    : 从redis中获取key=user的值为：张三

从输出的工厂类为LettuceConnectionFactory我们就可以看出，默认使用的Lettuce

2. spring boot 整合data redis （jedis）

只需要修改pom，业务代码都不需要修改

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

    <groupId>com.heichong</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>demo</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
            <!-- 排除lettuce包，使用jedis代替-->
            <exclusions>
                <exclusion>
                    <groupId>io.lettuce</groupId>
                    <artifactId>lettuce-core</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!-- jedis -->
        <dependency>
            <groupId>redis.clients</groupId>
            <artifactId>jedis</artifactId>
            <version>2.9.0</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>

• 再次运行日志如下

2018-08-09 09:34:29.500  INFO 7131 --- [           main] com.heichong.demo.redis.SimpleService    : redis连接工厂：org.springframework.data.redis.connection.jedis.JedisConnectionFactory@60d1a32f
2018-08-09 09:34:29.553  INFO 7131 --- [           main] com.heichong.demo.redis.SimpleService    : 从redis中获取key=user的值为：张三

从输出的工厂类为JedisConnectionFactory我们就可以看出，redis客户端已经变为jedis