### 数据库访问配置
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://192.168.66.100:3307/test?useSSL=false&allowPublicKeyRetrieval=true&serverTimezone=UTC
spring.datasource.username=root
spring.datasource.password=123456
########################################################
### Java Persistence Api --y
########################################################
# Specify the DBMS
spring.jpa.database = MYSQL
# Show or not log for each sql query
spring.jpa.show-sql = true
# Hibernate ddl auto (create, create-drop, update)
spring.jpa.hibernate.ddl-auto = update
# Naming strategy
#[org.hibernate.cfg.ImprovedNamingStrategy  #org.hibernate.cfg.DefaultNamingStrategy]
spring.jpa.hibernate.naming-strategy = org.hibernate.cfg.ImprovedNamingStrategy
# stripped before adding them to the entity manager)
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect
########################################################
### 配置连接池数据库访问配置
########################################################
#Redis服务器连接地址
spring.redis.host=192.168.66.100
#Redis服务器连接端口
spring.redis.port=6379
#连接池最大连接数（使用负值表示没有限制）
spring.redis.pool.max-active=8
#连接池最大阻塞等待时间（使用负值表示没有限制）
spring.redis.pool.max-wait=-1
#连接池中的最大空闲连接
spring.redis.pool.max-idle=8
#连接池中的最小空闲连接
spring.redis.pool.min-idle=0
#连接超时时间（毫秒）
spring.redis.timeout=30000
logging.pattern.console=%d{MM/dd HH:mm:ss.SSS} %clr(%-5level) ---  [%-15thread] %cyan(%-50logger{50}):%msg%n

package com.zj.redis.pojo;
import lombok.Data;
import javax.persistence.*;
@Data
@Entity
@Table(name = "goods")
public class GoodsEntity {
   //自增ID
   @Id
   @GeneratedValue(strategy= GenerationType.IDENTITY)//自增
   private Long id;
   // 商品名字
   private String goodsName;
   // 订单id
   private String orderId;
   // 商品数量
   private Integer goodsNum;
   // 商品价格
   private Double price;
}

package com.zj.redis.mapper;
import com.zj.redis.pojo.GoodsEntity;
import org.springframework.data.jpa.repository.JpaRepository;
/*
   GoodsEntity：表示的是实体类
   Long:表示的是实体的主键的类型
 */
public interface GoodsMapper extends JpaRepository<GoodsEntity,Long> {
}

package com.zj.redis.service;
import com.zj.redis.mapper.GoodsMapper;
import com.zj.redis.pojo.GoodsEntity;
import org.springframework.stereotype.Service;
import javax.annotation.Resource;
import java.util.Optional;
@Service
public class GoodsService {
    @Resource
    private GoodsMapper goodsMapper;
    //根据商品的id查询商品的信息
    public GoodsEntity selectById(Long id) {
        Optional<GoodsEntity> goodsEntity  = goodsMapper.findById(id);
        if ( goodsEntity.isPresent()){
            return goodsEntity.get();
        }
        return null;
    }
}

package com.zj.redis.controller;
import com.zj.redis.pojo.GoodsEntity;
import com.zj.redis.service.GoodsService;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.annotation.Resource;
@RestController
public class GoodsController {
    @Resource
    private GoodsService goodsService;
    //根据id查询商品
    @GetMapping("/goods")
    public GoodsEntity findById(String id) {
      return goodsService.selectById(Long.valueOf(id));
    }
}

#查看全部docker容器
[root@localhost /]# docker ps -a
#启动MySQL容器
[root@localhost /]# docker start 43f

package com.zj.redis.service;
import com.alibaba.fastjson.JSON;
import com.zj.redis.mapper.GoodsMapper;
import com.zj.redis.pojo.GoodsEntity;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;
import javax.annotation.Resource;
@Service
public class GoodsService {
    @Resource
    private GoodsMapper goodsMapper;
    @Resource
    private StringRedisTemplate stringRedisTemplate;
    //根据商品的id查询商品的信息
    public GoodsEntity selectById(Long id) {
        String goodString = stringRedisTemplate.opsForValue().get("good:" + id);
        //判断有没有缓存
        if (StringUtils.isEmpty(goodString)) {
            //从数据库查询信息
            GoodsEntity goodsEntity = goodsMapper.findById(Long.valueOf(id)).get();
            //将对象转为json格式
            String goodsEntityJson = JSON.toJSONString(goodsEntity);
            //添加到redis缓存
            stringRedisTemplate.opsForValue().set("good:" + id, goodsEntityJson);
            return goodsEntity;
        }else {
            //字符串转为对象类型
            GoodsEntity goodsEntity = JSON.parseObject(goodString, GoodsEntity.class);
            return goodsEntity;
        }
    }
}

[root@localhost src]# ./redis-server ../redis.conf