<dependency>
    <groupId>com.google.guava</groupId>
    <artifactId>guava</artifactId>
    <version>18.0</version>
   </dependency>

public interface CacheService {
  //存
  void setCommonCache(String key,Object value);
  //取
  Object getCommonCache(String key);
}

import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import com.wu.service.CacheService;
import org.springframework.stereotype.Service;
import javax.annotation.PostConstruct;
import java.util.concurrent.TimeUnit;
@Service
public class CacheServiceImpl implements CacheService {
  private Cache<String,Object> commonCache=null;
  @PostConstruct//代理此bean時會首先執(zhí)行該初始化方法
  public void init(){
    commonCache= CacheBuilder.newBuilder()
        //設置緩存容器的初始化容量為10（可以存10個鍵值對）
        .initialCapacity(10)
        //最大緩存容量是100,超過100后會安裝LRU策略-最近最少使用，具體百度-移除緩存項
        .maximumSize(100)
        //設置寫入緩存后1分鐘后過期
        .expireAfterWrite(60, TimeUnit.SECONDS).build();
  }
  @Override
  public void setCommonCache(String key, Object value) {
    commonCache.put(key,value);
  }
  @Override
  public Object getCommonCache(String key) {
    return commonCache.getIfPresent(key);
  }
}