SpringBoot中的Cache缓存

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@EnableCachingpublic 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;@Servicepublic 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

    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

    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