描述：

• 當(dāng)使用spring cache的注釋@cacheable亿昏，@cacheput等語法處理緩存問題時峦剔，很容易會出現(xiàn)如果緩存數(shù)據(jù)庫出現(xiàn)問題，宕機(jī)的情況導(dǎo)致關(guān)閉角钩。一般而言這時候我們希望將無法連接的異常捕獲顯示吝沫，然后再繼續(xù)連接數(shù)據(jù)庫呻澜。但是我們使用的注解語言無法catch exception，所以最后導(dǎo)致的結(jié)果是直接導(dǎo)致整個服務(wù)器報錯無法正常工作惨险。

解決方法（spring boot中）

創(chuàng)建一個繼承redisCacheManager的自定義類易迹。

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.cache.Cache;
import org.springframework.data.redis.cache.RedisCacheManager;
import org.springframework.data.redis.core.RedisOperations;
import org.springframework.util.Assert;

import java.util.concurrent.Callable;

class CustomRedisCacheManager extends RedisCacheManager {
    private static Logger logger = LoggerFactory.getLogger(CustomRedisCacheManager.class);

    public CustomRedisCacheManager(RedisOperations redisOperations) {
        super(redisOperations);
    }

    @Override
    public Cache getCache(String name) {
        return new RedisCacheWrapper(super.getCache(name));
    }


    protected static class RedisCacheWrapper implements Cache {

        private final Cache delegate;

        public RedisCacheWrapper(Cache redisCache) {
            Assert.notNull(redisCache, "delegate cache must not be null");
            this.delegate = redisCache;
        }

        @Override
        public String getName() {
            try {
                return delegate.getName();
            } catch (Exception e) {
                return handleException(e);
            }
        }

        @Override
        public Object getNativeCache() {
            try {
                return delegate.getNativeCache();
            } catch (Exception e) {
                return handleException(e);
            }
        }

        @Override
        public Cache.ValueWrapper get(Object key) {
            try {
                return delegate.get(key);
            } catch (Exception e) {
                return handleException(e);
            }
        }

        @Override
        public <T> T get(Object o, Class<T> aClass) {
            try {
                return delegate.get(o, aClass);
            } catch (Exception e) {
                return handleException(e);
            }
        }

        @Override
        public <T> T get(Object o, Callable<T> callable) {
            try {
                return delegate.get(o, callable);
            } catch (Exception e) {
                return handleException(e);
            }
        }

        @Override
        public void put(Object key, Object value) {
            try {
                delegate.put(key, value);
            } catch (Exception e) {
                handleException(e);
            }
        }

        @Override
        public ValueWrapper putIfAbsent(Object o, Object o1) {
            try {
                return delegate.putIfAbsent(o, o1);
            } catch (Exception e) {
                return handleException(e);
            }
        }

        @Override
        public void evict(Object o) {
            try {
                delegate.evict(o);
            } catch (Exception e) {
                handleException(e);
            }
        }

        @Override
        public void clear() {
            try {
                delegate.clear();
            } catch (Exception e) {
                handleException(e);
            }
        }

        private <T> T handleException(Exception e) {
            logger.error("handleException", e);
            return null;
        }
    }
}

然后在configuration應(yīng)用這個自定義的redisCacheManager.

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.cache.RedisCacheManager;
import org.springframework.data.redis.core.RedisTemplate;

@Configuration
public class RedisConfig {
    @Bean
    public RedisCacheManager redisCacheManager(RedisTemplate redisTemplate) {
        CustomRedisCacheManager redisCacheManager = new CustomRedisCacheManager(redisTemplate);
        redisCacheManager.setUsePrefix(true);
        return redisCacheManager;
    }
}

感謝https://stackoverflow.com/questions/29003786/how-to-disable-redis-caching-at-run-time-if-redis-connection-failed中@John Blum的回答
---end---