本地緩存

本地緩存存儲在內存當中，實現緩存如下

首先需要引入包

<dependency>
    <groupId>net.sf.ehcache</groupId>
    <artifactId>ehcache</artifactId>
    <version>2.10.1</version>
</dependency>

緩存服務接口：

package com.mobcb.platform.service.common;

import net.sf.ehcache.Cache;

public interface EhcacheService {

    public void clearCache(String cacheName, String cacheKey);

    public void putCache(String cacheName, String cacheKey, Object value);

    public Object getCacheValue(String cacheName, String cacheKey);

    public Cache getCache(String cacheName);

    /**
     * 設置緩存
     *
     * @param cacheName         緩存名稱
     * @param cacheKey          緩存key
     * @param value             值
     * @param timeToLiveSeconds 存在時間，單位秒
     */
    public void putCache(String cacheName, String cacheKey, Object value,
            int timeToLiveSeconds);

}

EhcacheService 接口實現：

package com.mobcb.platform.service.impl.common;

import com.mobcb.platform.service.common.EhcacheService;
import javax.annotation.Resource;
import net.sf.ehcache.Cache;
import net.sf.ehcache.CacheManager;
import net.sf.ehcache.Element;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.stereotype.Service;

@Service("ehcacheService")
public class EhcacheServiceImpl implements EhcacheService {

    private static Log logger = LogFactory.getLog(EhcacheServiceImpl.class);

    @Resource(name = "ehCacheManager")
    private CacheManager cacheManger;

    private boolean createCacheIfNotFound = true;

    @Override
    public void clearCache(String cacheName, String cacheKey) {
        Cache cache = getCache(cacheName);
        if (cache == null) {
            return;
        }
        cache.remove(cacheKey);

    }

    @Override
    public void putCache(String cacheName, String cacheKey, Object value) {
        Cache cache = getCache(cacheName);
        if (cache == null) {
            return;
        }
        cache.put(new Element(cacheKey, value));

    }

    @Override
    public Object getCacheValue(String cacheName, String cacheKey) {
        Cache cache = getCache(cacheName);
        if (cache == null) {
            return null;
        }
        Element element = cache.get(cacheKey);
        if (element == null || element.isExpired()) {
            return null;
        }
        return element.getObjectValue();
    }

    @Override
    public Cache getCache(String cacheName) {
        Cache cache = cacheManger.getCache(cacheName);
        if (cache == null && createCacheIfNotFound) {
            cache = (Cache) cacheManger.addCacheIfAbsent(cacheName);
        }
        if (cache == null) {
            logger.error("EHCache: cache not config and not auto created, cacheName="
                    + cacheName);
        }
        return cache;
    }

    @Override
    public void putCache(String cacheName, String cacheKey, Object value, int timeToLiveSeconds) {
        Cache cache = getCache(cacheName);
        if (cache == null) {
            return;
        }
        cache.put(new Element(cacheKey, value, timeToLiveSeconds,
                timeToLiveSeconds));
    }
}

緩存使用示例：

引入緩存服務接口

/**
 * 緩存服務
 */
@Resource(name = "ehcacheService")
private EhcacheService ehcacheService;

調用：

Object requestSource = ehcacheService.getCacheValue(
        "SHCAuth", "SHCAuthKey");
logger.info("------------------------緩存獲取認證碼"+requestSource+"-----------------------");

第一個參數是緩存名，第二個是緩存名下的鍵值

Redis緩存

java本地緩存和redis緩存