使用springCache实现缓存

简介

这个springCache貌似jdk8或者以上才可以

cache最好加在controller层，毕竟返回给前端的数据，在这一步才是最完整的，缓存controller的数据才有意义

在这里插入图片描述

配置

导入依赖

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

@EnableCaching // 开启缓存注解

@Slf4j
@SpringBootApplication
@EnableCaching // 开启缓存注解
public class CacheDemoApplication {public static void main(String[] args) {SpringApplication.run(CacheDemoApplication.class,args);log.info("项目启动成功...");}
}

配置一下redis

server:port: 8888
spring:datasource:druid:driver-class-name: com.mysql.cj.jdbc.Driverurl: jdbc:mysql://localhost:3306/spring_cache_demo?serverTimezone=Asia/Shanghai&useUnicode=true&characterEncoding=utf-8&zeroDateTimeBehavior=convertToNull&useSSL=false&allowPublicKeyRetrieval=trueusername: rootpassword: rootredis:host: localhostport: 6379database: 1

注解CachePut

key有两种写法

    @PostMapping@CachePut(cacheNames = "userCache",key = "#user.id") // 更新缓存 key的生成是 userCache::id 形参user.id
//    @CachePut(cacheNames = "userCache",key = "#result.id") // 更新缓存 key的生成是 userCache::id 返回值idpublic User save(@RequestBody User user){userMapper.insert(user);return user;}

注解@Cacheable

查询缓存 key的生成是 userCache::id）（如果有缓存则直接返回缓存，没有则查询数据库，然后将查询结果缓存）

    @GetMapping@Cacheable(cacheNames = "userCache",key = "#id") // 查询缓存 key的生成是 userCache::id）（如果有缓存则直接返回缓存，没有则查询数据库，然后将查询结果缓存）public User getById(Long id){User user = userMapper.getById(id);return user;}

注解@CacheEvict

分为删除一个和删除所有

    @DeleteMapping@CacheEvict(cacheNames = "userCache",key = "#id") // 删除缓存 key是 userCache::idpublic void deleteById(Long id){userMapper.deleteById(id);}@DeleteMapping("/delAll")@CacheEvict(cacheNames = "userCache",allEntries = true) // 删除缓存 key是 userCache::idpublic void deleteAll(){userMapper.deleteAll();}