redis缓存

PingMo_

已于 2023-04-25 10:55:30 修改

阅读量147

点赞数

CC 4.0 BY-SA版权

文章标签：缓存 redis java

于 2023-04-25 10:51:35 首次发布

本文链接：https://blog.youkuaiyun.com/PingMo_/article/details/130358625

该文章展示了一个SpringBoot项目中引入MySQL和Redis依赖的配置过程，包括POM.xml中的依赖管理以及application.properties中的数据库和Redis设置。此外，还展示了如何在Service层使用RedisTemplate进行数据存取操作。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

引入mysql 和 redis 的依赖

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.12.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>pm</groupId>
    <artifactId>redis1</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>redis1</name>
    <description>redis1</description>
    <properties>
        <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.apache.commons</groupId>
            <artifactId>commons-pool2</artifactId>
        </dependency>
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.5.1</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </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>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

修改配置文件

server.port=8888
spring.datasource.url=jdbc:mysql:///db1
spring.datasource.password=123456
spring.datasource.username=root
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

mybatis-plus.configuration.log-impl=org.apache.ibatis.logging.stdout.StdOutImpl

#redis?????
spring.redis.host=192.168.32.175
spring.redis.port=6379
#?????
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

service层

package pm.redis1.service.impl;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.ValueOperations;
import pm.redis1.pojo.Dept;
import pm.redis1.service.DeptService;
import pm.redis1.mapper.DeptMapper;
import org.springframework.stereotype.Service;

/**
* @author 79938
* @description 针对表【dept】的数据库操作Service实现
* @createDate 2023-04-25 10:14:16
*/
@Service
public class DeptServiceImpl implements DeptService{
    @Autowired
    DeptMapper deptMapper;
    @Autowired
    RedisTemplate<String,Object> redisTemplate;

    @Override
    public Dept getById(Integer id) {
        ValueOperations<String, Object> forValue = redisTemplate.opsForValue();
        Object o = forValue.get("dept::" + id);
        System.out.println(o);
        if(o!=null){
            return (Dept) o;
        }
        Dept dept = deptMapper.selectById(id);
        if (dept!=null){
            forValue.set("dept::"+id,dept);
        }

        return dept;
    }
}