外国vps开发redis二级缓存的示例：



redis二级缓存的实现，主要是重写了Cache.java的方法，代码：



publicclassimplementsCache{



privatestaticfinalLoggerlogger=LoggerFactory.getLogger(MybatisRedisCache.class);



privatefinalReadWriteLockreadWriteLock=newReentrantReadWriteLock();



privateRedisTemplateredisTemplate;



privateStringid;







privatestaticfinallongEXPIRE_TIME_IN_MINUTES=30;



public(Stringid){



if(id==null){



thrownewIllegalArgumentException("CacheinstancesrequireanID");



}



logger.info("=====================================Rediscacheid="+id);



this.id=id;



}







publicStringgetId(){



returnid;



}







publicvoidputObject(Objectkey,Objectvalue){



logger.debug("==============================redisput="+key);



RedisTemplateredisTemplate=getRedisTemplate();



ValueOperationsopsForValue=redisTemplate.opsForValue();



opsForValue.set(key,value,EXPIRE_TIME_IN_MINUTES,TimeUnit.MINUTES);



}







publicObjectgetObject(Objectkey){



logger.debug("================================redisget================================");



RedisTemplateredisTemplate=getRedisTemplate();



ValueOperationsopsForValue=redisTemplate.opsForValue();



returnopsForValue.get(key);



}







publicObjectremoveObject(Objectkey){



logger.debug("==========================================redisremove==========================");



RedisTemplateredisTemplate=getRedisTemplate();



redisTemplate.delete(key);



returnnull;



}







publicvoidclear(){



logger.debug("=====================================clearredis================================");



RedisTemplateredisTemplate=getRedisTemplate();



redisTemplate.execute(newRedisCallback(){



@Override



publicObjectdoInRedis(RedisConnectionconnection)throwsDataAccessException{



大专栏redis实现二级缓存



connection.flushDb();



return"OK";



}



});



}



@Override



publicintgetSize(){



return0;



}



@Override



publicReadWriteLockgetReadWriteLock(){



returnreadWriteLock;



}



publicRedisTemplategetRedisTemplate(){



if(redisTemplate==null){



redisTemplate=ApplicationContextHolder.getBean("redisTemplate");



}



returnredisTemplate;



}



publicvoidsetRedisTemplate(RedisTemplateredisTemplate){



this.redisTemplate=redisTemplate;



}



}



使用redisTemplate方法实现一个ApplicationContextHolder工具类，代码：



@Component



publicclassApplicationContextHolderimplementsApplicationContextAware{



privatestaticApplicationContextapplicationContext;



@Override



publicvoidsetApplicationContext(ApplicationContextctx)throwsBeansException{



applicationContext=ctx;



}



/**



*Getapplicationcontextfromeverywhere



*



*@return



*/



publicstaticApplicationContextgetApplicationContext(){



returnapplicationContext;



}



/**



*Getbeanbyclass



*



*@paramclazz



*@param



*@return



*/



publicstaticTgetBean(Classclazz){



returnapplicationContext.getBean(clazz);



}



/**



*Getbeanbyclassname



*



*@paramname



*@param



*@return



*/



@SuppressWarnings("unchecked")



publicstaticTgetBean(Stringname){



return(T)applicationContext.getBean(name);



}



}



在mapper中添加自定义cache，使用二级缓存，例如：




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