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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：

public class implements Cache {

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

private final ReadWriteLock readWriteLock = new ReentrantReadWriteLock();

private RedisTemplate redisTemplate;

private String id;

private static final long EXPIRE_TIME_IN_MINUTES = 30;

public (String id){

if (id==null){

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

}

logger.info("=====================================Redis cache id = "+id);

this.id = id;

}

public String getId() {

return id;

}

public void putObject(Object key, Object value) {

logger.debug("==============================redis put= "+key);

RedisTemplate redisTemplate = getRedisTemplate();

ValueOperations opsForValue = redisTemplate.opsForValue();

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

}

public Object getObject(Object key) {

logger.debug("================================redis get================================");

RedisTemplate redisTemplate = getRedisTemplate();

ValueOperations opsForValue = redisTemplate.opsForValue();

return opsForValue.get(key);

}

public Object removeObject(Object key) {

logger.debug("==========================================redis remove==========================");

RedisTemplate redisTemplate = getRedisTemplate();

redisTemplate.delete(key);

return null;

}

public void clear() {

logger.debug("=====================================clear redis================================");

RedisTemplate redisTemplate = getRedisTemplate();

redisTemplate.execute(new RedisCallback() {

@Override

public Object doInRedis(RedisConnection connection) throws DataAccessException {

大专栏 redis实现二级缓存

connection.flushDb();

return "OK";

}

});

}

@Override

public int getSize() {

return 0;

}

@Override

public ReadWriteLock getReadWriteLock() {

return readWriteLock;

}

public RedisTemplate getRedisTemplate() {

if (redisTemplate == null) {

redisTemplate = ApplicationContextHolder.getBean("redisTemplate");

}

return redisTemplate;

}

public void setRedisTemplate(RedisTemplate redisTemplate) {

this.redisTemplate = redisTemplate;

}

}

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

@Component

public class ApplicationContextHolder implements ApplicationContextAware {

private static ApplicationContext applicationContext;

@Override

public void setApplicationContext(ApplicationContext ctx) throws BeansException {

applicationContext = ctx;

}

/**

* Get application context from everywhere

*

* @return

*/

public static ApplicationContext getApplicationContext() {

return applicationContext;

}

/**

* Get bean by class

*

* @param clazz

* @param <T>

* @return

*/

public static <T> T getBean(Class<T> clazz) {

return applicationContext.getBean(clazz);

}

/**

* Get bean by class name

*

* @param name

* @param <T>

* @return

*/

@SuppressWarnings("unchecked")

public static <T> T getBean(String name) {

return (T) applicationContext.getBean(name);

}

}

在mapper中添加自定义cache，使用二级缓存，例如：

<cache type="com.yif.utils.MybatisRedisCache" eviction="LRU"/>

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