Spring MVC 使用Ehcache作为缓存的例子

一）POM文件

pom.xml

<dependency>
		<groupId>net.sf.ehcache</groupId>
		<artifactId>ehcache</artifactId>
		<version>2.9.0</version>
	</dependency>

        <!-- Optional, to log stuff -->
	<dependency>
		<groupId>ch.qos.logback</groupId>
		<artifactId>logback-classic</artifactId>
		<version>1.0.13</version>
	</dependency>

	<!-- Spring caching framework inside this -->
	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-context</artifactId>
		<version>4.1.4.RELEASE</version>
	</dependency>

	<!-- Support for Ehcache and others -->
	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-context-support</artifactId>
		<version>4.1.4.RELEASE</version>
	</dependency>
</project>

二）配置文件
注意cache name，后面的service要用到

<ehcache>
<diskStore path="java.io.tmpdir"/>
<defaultCache
        maxElementsInMemory="1000"
        eternal="false"
        timeToIdleSeconds="120"
        timeToLiveSeconds="120"
        overflowToDisk="false"/>
<cache name="cache" 
       maxElementsOnDisk="20000"
       maxElementsInMemory="2000"
       eternal="true"
       overflowToDisk="true"
       diskPersistent="true"/>
</ehcache>

Spring的配置文件applicationContext.xml

    <cache:annotation-driven cache-manager="cacheManager"/>

    <bean id="ehcacheManager" class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean">
        <property name="configLocation" value="classpath:ehcache.xml"/>
    </bean>

    <bean id="cacheManager" class="org.springframework.cache.ehcache.EhCacheCacheManager">
        <property name="cacheManager" ref="ehcacheManager"/>
        <property name="transactionAware" value="true"/>
    </bean>

三）Service
Cacheable:
当读取的时候会从缓存中找数据，如果没有，那么就从数据库中获取，注意value的值，要和EHcache配置文件的cache名字相同
CacheEvict：
当执行这个方法的时候删除缓存。

    @Override
    @Cacheable(value="cache")
    public Map<String, List<CodeListCache>> getCodeListCache() {
        List<CCodelistLine> listCodeListLine = this.mapper.selectDataForCache();
        for (CCodelistLine item:listCodeListLine){
            CodeListCache codeListCache = new CodeListCache();
            codeListCache.setCode(item.getCode());
            codeListCache.setCodeValue(item.getCodeValue());
            codeListCache.setCodeText1(item.getCodeText1());
            codeListCache.setCodeText2(item.getCodeText2());
            codeListCache.setCodeText3(item.getCodeText3());
            if(!cacheMap.containsKey(item.getCode())){
                cacheMap.put(item.getCode(),new ArrayList<>());
            }
            cacheMap.get(item.getCode()).add(codeListCache);
        }
        return cacheMap;
    }

    @CacheEvict(value="cache")
    public void updateCodeList(CCodelistLine codelistLine){
        if(codelistLine.getId() != null){
            this.mapper.update(codelistLine);
        }else {
            this.mapper.update(codelistLine);
        }
    }
    @CacheEvict(value="cache")
    public void deleteCodeList(String[] ids){
        this.mapper.deleteByPrimaryKeys(ids);
    }

OK,整个配置过程就这么完成。