http://blog.csdn.net/qq18998401056/article/details/53467671
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在Spring Boot中通过@EnableCaching注解自动化配置合适的缓存管理器（CacheManager），Spring Boot根据下面的顺序去侦测缓存提供者：
Generic
JCache (JSR-107)
EhCache 2.x
Hazelcast
Infinispan
Redis
Guava
Simple
除了按顺序侦测外，我们也可以通过配置属性spring.cache.type来强制指定。默认是simple类型。
由于ehcache3.x实现了jsr-107的标准接口，而本文通过整合ehcache3.x来使用JCache的方式。
引入依赖如下:
<dependency> <groupId>org.ehcache</groupId> <artifactId>ehcache</artifactId> <version>3.1.3</version> </dependency> <!-- JSR107 API --> <dependency> <groupId>javax.cache</groupId> <artifactId>cache-api</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-cache</artifactId> </dependency>
ehcache 3.x配置文件如下:
<?xml version="1.0" encoding="UTF-8"?> <config xmlns:xsi=‘http://www.w3.org/2001/XMLSchema-instance‘ xmlns:jsr107=‘http://www.ehcache.org/v3/jsr107‘ xmlns=‘http://www.ehcache.org/v3‘ xsi:schemaLocation=" http://www.ehcache.org/v3 http://www.ehcache.org/schema/ehcache-core-3.1.xsd http://www.ehcache.org/v3/jsr107 http://www.ehcache.org/schema/ehcache-107-ext-3.1.xsd"> <!-- <service> <jsr107:defaults> <jsr107:cache name="city" template="heap-cache"/> </jsr107:defaults> </service> --> <cache-template name="heap-cache"> <resources> <heap unit="entries">2000</heap> <offheap unit="MB">100</offheap> </resources> </cache-template> <cache alias="city" uses-template="heap-cache"> <expiry> <ttl unit="seconds">40</ttl> </expiry> </cache> </config>
spring boot application.properties配置如下:
#注意:ehcache3.x配置文件路径必须指定 spring.cache.jcache.config=classpath:ehcache.xml
在spring boot 使用@EnableCaching 开启缓存
最后，贴出spring cache注解例子伪代码：
package com.lrh.service; import java.util.List; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.cache.annotation.CacheConfig; import org.springframework.cache.annotation.CacheEvict; import org.springframework.cache.annotation.CachePut; import org.springframework.cache.annotation.Cacheable; import org.springframework.stereotype.Service; import org.springframework.transaction.annotation.Transactional; import com.github.pagehelper.PageHelper; import com.github.pagehelper.PageInfo; import com.lrh.dao.CityMapper; import com.lrh.domain.City; import com.lrh.iservice.CityService; @Service @Transactional @CacheConfig(cacheNames = "city") //@CacheDefaults(cacheName = "city") public class CityServiceImpl implements CityService{ @Autowired private CityMapper cityMapper; @Override @CachePut(key = "#id") public City editCity(String id, String name) { cityMapper.edit(id, name); City city=new City(); city.setId(Long.valueOf(id)); city.setName(name); return city; } @Override public PageInfo<City> selectCityByPage() { PageHelper.startPage(1,5); List<City> list = cityMapper.selectAll(); PageInfo<City> page = new PageInfo(list); return page; } /** * condition满足缓存条件的数据才会放入缓存，condition在调用方法之前和之后都会判断 * unless用于否决缓存更新的，不像condition，该表达只在方法执行之后判断，此时可以拿到返回值result进行判断了 */ @Override @Cacheable(key = "#id",unless="#result == null") //@CacheResult public City findById(String id) { return cityMapper.selectCityById(id); } @Override @CacheEvict(key="#id") public void delete(String id) { //cityMapper.delete(id); } /** * allEntries移除所有 */ @Override @CacheEvict(allEntries = true) public void deleteAll() { cityMapper.deleteAll(); } }
