SpringBoot中的Cache缓存

清疚 2022-06-09 10:39 216阅读 0赞

添加maven依赖：

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

入口类开启缓存支持：

package com.example.demo;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.boot.autoconfigure.domain.EntityScan;
    import org.springframework.cache.annotation.EnableCaching;
    
    @SpringBootApplication//核心注解，主要是开启自动配置
    //@EntityScan(basePackages = "com.example.**")
    //开启缓存支持
    @EnableCaching
    public class DemoApplication {
    
    	//项目启动的入口
    	public static void main(String[] args) {
    
    		SpringApplication.run(DemoApplication.class, args);
    	}
    }

service接口：

package com.example.demo.part3.chapter8.cache;
    
    import com.example.demo.part3.chapter8.jpa.Boy;
    
    public interface CacheService {
        public Boy save(Boy boy);
        public void remove(int id);
        public Boy findOne(int id);
    }

实现接口：

package com.example.demo.part3.chapter8.cache;
    
    import com.example.demo.part3.chapter8.jpa.Boy;
    import com.example.demo.part3.chapter8.jpa.BoyRepository;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.cache.annotation.CacheEvict;
    import org.springframework.cache.annotation.CachePut;
    import org.springframework.cache.annotation.Cacheable;
    import org.springframework.stereotype.Service;
    
    @Service
    public class CacheServiceImpl implements CacheService{
        @Autowired
        BoyRepository boyRepository;
        @Override
        //cacheput缓存新增的或者更新的数据到缓存，其中缓存名称为boy
        //数据的key是boy 的id
        @CachePut(value = "boy",key = "#boy.id")
        public Boy save(Boy boy) {
            System.out.println("增加了id为"+boy.getId()+"的缓存");
            return boyRepository.save(boy);
    
        }
    
        @Override
        //从缓存boy中删除key为id的数据
        @CacheEvict(value = "boy")
        public void remove(int id) {
            System.out.println("删除了id为"+id+"的缓存");
            //boyRepository.delete(id);
    
        }
    
        @Override
        //缓存key为id的数据到缓存boy中
        @Cacheable(value = "boy",key = "#id")
        public Boy findOne(int id) {
            System.out.println("增加了id为"+id+"的缓存");
            Boy boy=boyRepository.findOne(id);
            return boy;
        }
    }

控制层：

package com.example.demo.part3.chapter8.cache;
    
    import com.example.demo.part3.chapter8.jpa.Boy;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    @RestController
    @RequestMapping("/cc2")
    public class CacheController2 {
        @Autowired
        CacheService cacheService;
        @RequestMapping("/save")
        public Boy save(Boy boy){
            return cacheService.save(boy);
        }
        @RequestMapping("/remove")
        public void remove(int id){
            cacheService.remove(id);
        }
        @RequestMapping("/findOne")
        public Boy findOne(int id){
            return cacheService.findOne(id);
        }
    }

测试：

1. 执行findOne,再次执行findOne

![Center][]

第二次，控制台没有输出,表明没有操作数据库

2.执行save,再执行findOne

![Center 1][]

第二次，控制台没有输出,表明没有操作数据库

3.执行findOne,执行remove,再执行findOne

![Center 2][]

[Center]: /images/20220609/10381118e0d143e0a6eae1247087d055.png
[Center 1]: /images/20220609/5d874c0250f448b09fbfad2374201b66.png
[Center 2]: /images/20220609/dc05a4c37aa94e9cb7f8b84afc371116.png