spring缓存cache spring缓存cache的使用详解
书生杨阳 人气:0想了解spring缓存cache的使用详解的相关内容吗,书生杨阳在本文为您仔细讲解spring缓存cache的相关知识和一些Code实例,欢迎阅读和指正,我们先划重点:springcache,spring缓存,springcache缓存,下面大家一起来学习吧。
spring缓存cache的使用
在spring配置文件中添加schema和spring对缓存注解的支持:
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:p="http://www.springframework.org/schema/p" xmlns:cache="http://www.springframework.org/schema/cache" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/cache http://www.springframework.org/schema/cache/spring-cache.xsd" default-autowire="byName"> <!--缓存配置--> <cache:annotation-driven/>
在spring配置文件中加入缓存管理器:
<!-- generic cache manager --> <bean id="cacheManager" class="org.springframework.cache.support.SimpleCacheManager"> <property name="caches"> <set> <bean class="org.springframework.cache.concurrent.ConcurrentMapCacheFactoryBean" p:name="hardwareCache"/> <bean class="org.springframework.cache.concurrent.ConcurrentMapCacheFactoryBean" p:name="bannerCache"/> </set> </property> </bean>
然后在代码的service的impl层加上如下注解即可把数据缓存起来:
@Cacheable(value="bannerCache")
其中@Cacheable表示spring将缓存该方法获取到的数据,(缓存是基于key-value方式实现的),key为该方法的参数,value为返回的数据,当你连续访问该方法时你会发现只有第一次会访问数据库. 其他次数只是查询缓存.减轻了数据库的压力.
当更新了数据库的数据,需要让缓存失效时,使用下面的注解:
这个注解表示让appCache缓存的所有数据都失效。
@CacheEvict(value = "appCache", allEntries = true)
springcache配置缓存存活时间
Spring Cache @Cacheable本身不支持key expiration的设置,以下代码可自定义实现Spring Cache的expiration,针对Redis、SpringBoot2.0。
直接上代码:
@Service @Configuration public class CustomCacheMng{ private Logger logger = LoggerFactory.getLogger(this.getClass()); // 指明自定义cacheManager的bean name @Cacheable(value = "test",key = "'obj1'",cacheManager = "customCacheManager") public User cache1(){ User user = new User().setId(1); logger.info("1"); return user; } @Cacheable(value = "test",key = "'obj2'") public User cache2(){ User user = new User().setId(1); logger.info("2"); return user; } // 自定义的cacheManager,实现存活2天 @Bean(name = "customCacheManager") public CacheManager cacheManager( RedisTemplate<?, ?> redisTemplate) { RedisCacheWriter writer = RedisCacheWriter.lockingRedisCacheWriter(redisTemplate.getConnectionFactory()); RedisCacheConfiguration config = RedisCacheConfiguration.defaultCacheConfig().entryTtl(Duration.ofDays(2)); return new RedisCacheManager(writer, config); } // 提供默认的cacheManager,应用于全局 @Bean @Primary public CacheManager defaultCacheManager( RedisTemplate<?, ?> redisTemplate) { RedisCacheWriter writer = RedisCacheWriter.lockingRedisCacheWriter(redisTemplate.getConnectionFactory()); RedisCacheConfiguration config = RedisCacheConfiguration.defaultCacheConfig(); return new RedisCacheManager(writer, config); } }
以上为个人经验,希望能给大家一个参考,也希望大家多多支持。
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