SpringBoot开启缓存注解

https://blog.csdn.net/sanjay_f/article/details/47372967

https://www.cnblogs.com/lic309/p/4072848.html

https://blog.csdn.net/u012373815/article/details/54564076/

Spring Boot开启缓存注解

1:Spring Boot 常用缓存配置：

@Cacheable、@CachePut、@CacheEvict 注释介绍

@Cacheable

开启缓存，将查询到的结果对象，存到缓存中，一般用在查询方法上

    @Cacheable(cacheNames = {"queryNews"})
    public News queryNews(long htmlid) {
        logger.debug(htmlid);
        return foreMapper.queryNews(htmlid);
    }

查询结果作为缓存，给缓存一个名字，如果没有默认的键，就用方法的参数作为键。

@CachePut

将添加的对象加到缓存中，一般用在插入，更新方法上

@CacheEvict

将缓存废弃，一般添加到删除方法上

    @CacheEvict(cacheNames = {"queryByCategory","queryNews","backQuery","selectCount"},allEntries=true)
    public int delete(long htmlid) throws Exception{
        int i1=manageMapper.deleteNewshtmlid(htmlid);
        int i2=manageMapper.deleteNewslistHtmlid(htmlid);
        return i1;
    }

一次可以删除多个缓存，根据缓存名。allEtries设置为true，将集合中的缓存一下删完。

2：自定义缓存，使用Spring Boot配置

添加依赖

'net.sf.ehcache:ehcache:2.8.3'

package com.li.configuration;

import org.springframework.cache.annotation.EnableCaching;
import org.springframework.cache.ehcache.EhCacheCacheManager;
import org.springframework.cache.ehcache.EhCacheManagerFactoryBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.ClassPathResource;

@Configuration
// 标注启动了缓存
@encaching
public class CacheConfiguration {

    /*
     * ehcache 主要的管理器
     */
    @Bean(name = "appEhCacheCacheManager")
    public EhCacheCacheManager ehCacheCacheManager(EhCacheManagerFactoryBean bean){
        return new EhCacheCacheManager (bean.getObject ());
    }

    /*
     * 据shared与否的设置,Spring分别通过CacheManager.create()或new CacheManager()方式来创建一个ehcache基地.
     */
    @Bean
    public EhCacheManagerFactoryBean ehCacheManagerFactoryBean(){
        EhCacheManagerFactoryBean cacheManagerFactoryBean = new EhCacheManagerFactoryBean ();
        cacheManagerFactoryBean.setConfigLocation (new ClassPathResource("/encache.xml"));
        cacheManagerFactoryBean.setShared (true);
        return cacheManagerFactoryBean;
    }
}

添加配置文件

<?xml version="1.0" encoding="UTF-8"?>
<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://ehcache.org/ehcache.xsd"
         updateCheck="false">
    <diskStore path="java.io.tmpdir/Tmp_EhCache" />

    <defaultCache eternal="true" maxElementsInMemory="1000" overflowToDisk="false" diskPersistent="false"
                  timeToIdleSeconds="0" timeToLiveSeconds="600" memoryStoreEvictionPolicy="LRU" />

    <cache name="queryByCategory" eternal="true" maxElementsInMemory="5000" overflowToDisk="false" diskPersistent="false"
           timeToIdleSeconds="0" timeToLiveSeconds="300" memoryStoreEvictionPolicy="LRU" />

    <cache name="queryNews" eternal="true" maxElementsInMemory="5000" overflowToDisk="false" diskPersistent="false"
           timeToIdleSeconds="0" timeToLiveSeconds="300" memoryStoreEvictionPolicy="LRU" />

    <cache name="queryGroup" eternal="true" maxElementsInMemory="1000" overflowToDisk="false" diskPersistent="false"
           timeToIdleSeconds="0" timeToLiveSeconds="300" memoryStoreEvictionPolicy="LRU" />

    <cache name="queryByHtmlid" eternal="true" maxElementsInMemory="1000" overflowToDisk="false" diskPersistent="false"
           timeToIdleSeconds="0" timeToLiveSeconds="300" memoryStoreEvictionPolicy="LRU" />

    <cache name="query" eternal="true" maxElementsInMemory="1000" overflowToDisk="false" diskPersistent="false"
           timeToIdleSeconds="0" timeToLiveSeconds="300" memoryStoreEvictionPolicy="LRU" />

    <cache name="backQuery" eternal="true" maxElementsInMemory="1000" overflowToDisk="false" diskPersistent="false"
           timeToIdleSeconds="0" timeToLiveSeconds="300" memoryStoreEvictionPolicy="LRU" />

    <cache name="selectCount" eternal="true" maxElementsInMemory="1000" overflowToDisk="false" diskPersistent="false"
           timeToIdleSeconds="0" timeToLiveSeconds="300" memoryStoreEvictionPolicy="LRU" />

</ehcache>