mybatis默認緩存是PerpetualCache，可以查看一下它的源碼，發現其是Cache接口的實現；那么我們的緩存只要實現該接口即可。

該接口有以下方法需要實現：

? String getId();
? int getSize();
? void putObject(Object key, Object value);
? Object getObject(Object key);
? Object removeObject(Object key);
? void clear();
? ReadWriteLock getReadWriteLock();

1 實現類：

[java]?view plaincopy

package app.platform.mybatis

import?java.util.concurrent.locks.ReadWriteLock;??

import?java.util.concurrent.locks.ReentrantReadWriteLock;??

??

import?org.apache.ibatis.cache.Cache;??

import?org.slf4j.Logger;??

import?org.slf4j.LoggerFactory;??

??

import?redis.clients.jedis.Jedis;??

import?redis.clients.jedis.JedisPool;??

import?redis.clients.jedis.JedisPoolConfig;??

??

??

public?class?MybatisRedisCache?implements?Cache?{??

??????

????private?static?Logger?logger?=?LoggerFactory.getLogger(MybatisRedisCache.class);??

????private?Jedis?redisClient=createReids();??

?????/**?The?ReadWriteLock.?*/????

????private?final?ReadWriteLock?readWriteLock?=?new?ReentrantReadWriteLock();???

??????

????private?String?id;??

??????

????public?MybatisRedisCache(final?String?id)?{????

????????if?(id?==?null)?{??

????????????throw?new?IllegalArgumentException("Cache?instances?require?an?ID");??

????????}??

????????logger.debug(">>>>>>>>>>>>>>>>>>>>>>>>MybatisRedisCache:id="+id);??

????????this.id?=?id;??

????}????

????@Override??

????public?String?getId()?{??

????????return?this.id;??

????}??

??

????@Override??

????public?int?getSize()?{??

?????

????????return?Integer.valueOf(redisClient.dbSize().toString());??

????}??

??

????@Override??

????public?void?putObject(Object?key,?Object?value)?{??

????????logger.debug(">>>>>>>>>>>>>>>>>>>>>>>>putObject:"+key+"="+value);??

????????redisClient.set(SerializeUtil.serialize(key.toString()),?SerializeUtil.serialize(value));??

????}??

??

????@Override??

????public?Object?getObject(Object?key)?{??

????????Object?value?=?SerializeUtil.unserialize(redisClient.get(SerializeUtil.serialize(key.toString())));??

????????logger.debug(">>>>>>>>>>>>>>>>>>>>>>>>getObject:"+key+"="+value);??

????????return?value;??

????}??

??

????@Override??

????public?Object?removeObject(Object?key)?{??

????????return?redisClient.expire(SerializeUtil.serialize(key.toString()),0);??

????}??

??

????@Override??

????public?void?clear()?{??

??????????redisClient.flushDB();??

????}??

????@Override??

????public?ReadWriteLock?getReadWriteLock()?{??

????????return?readWriteLock;??

????}??

????protected??static?Jedis?createReids(){??

????????JedisPool?pool?=?new?JedisPool(new?JedisPoolConfig(),?"10.12.162.85");??

????????return?pool.getResource();??

????}??

[java]?view plaincopy

public?class?SerializeUtil?{??

????public?static?byte[]?serialize(Object?object)?{??

????????ObjectOutputStream?oos?=?null;??

????????ByteArrayOutputStream?baos?=?null;??

????????try?{??

????????//序列化??

????????baos?=?new?ByteArrayOutputStream();??

????????oos?=?new?ObjectOutputStream(baos);??

????????oos.writeObject(object);??

????????byte[]?bytes?=?baos.toByteArray();??

????????return?bytes;??

????????}?catch?(Exception?e)?{??

?????????e.printStackTrace();??

????????}??

????????return?null;??

????????}??

???????????

????????public?static?Object?unserialize(byte[]?bytes)?{??

????????ByteArrayInputStream?bais?=?null;??

????????try?{??

????????//反序列化??

????????bais?=?new?ByteArrayInputStream(bytes);??

????????ObjectInputStream?ois?=?new?ObjectInputStream(bais);??

????????return?ois.readObject();??

????????}?catch?(Exception?e)?{??

???????????

????????}??

????????return?null;??

????????}??

2 spring中的mybatis配置

<!-- mybatis配置 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="mapperLocations" value="classpath*:app/mapper/**/*.xml"/>
? ? ? ? <property name="configLocation" value="classpath:/mybatis/mybatis-config.xml" />
</bean>

3 mybatis-config.xml 中的settings配制

<settings>
<!-- 開啟緩存支持 --> ?
<setting name="cacheEnabled" value="true" />
.......?
</settings>

?

4 在需要加緩存的sqlMap中加入<cache eviction="LRU" type="app.platform.mybatis.MybatisRedisCache" />

例：

<mapper namespace="SYS_ROLE">

? <!-- 緩存 -->
? <cache eviction="LRU" type="app.platform.mybatis.MybatisRedisCache" />

? ?<!-- 查詢所有 -->
<select id="findAll" parameterType="HashMap" resultType="HashMap">
select?
<include refid="base_column" />
from SYS_ROLE
where 1=1
<if test="BUS_TYPE!=null and BUS_TYPE!=''">
and BUS_TYPE ?=#{BUS_TYPE}
</if>
<if test="ENABLE!=null and ENABLE!=''">
and ENABLE ?=#{ENABLE}
</if>
<if test="ROLE_NAME!=null and ROLE_NAME!=''">
and ROLE_NAME like '%'||#{ROLE_NAME}||'%'
</if>
<if test="ROLE_OTHER_NAME!=null and ROLE_OTHER_NAME!=''">
and ROLE_OTHER_NAME like '%'||#{ROLE_OTHER_NAME}||'%'
</if>
</select>

</mapper>

本文參考了http://blog.csdn.net/nmgrlq/article/details/7996925，按他的方式沒配置成功，按上面的方式修改后成功

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