spring boot spring cache ehcache3.x整合

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();    }}