datacache.java

机械工业出版社的《jsp2.0动态网站开发实例指南》的源代码

package DataCenterPackage;

import java.util.Properties;

public class DataCache 
{
   private Properties _cache;
    private static DataCache _INSTANCE;

   private DataCache()
   {
       _cache = new Properties();
   }

    public static DataCache GetDataCache(){
        if(_INSTANCE == null)
            _INSTANCE = new DataCache();
        return _INSTANCE;
    }
   public void AddToCache(String key, Object data)
   {
       _cache.put(key,data);
   }

   public void RemoveFromCache(String key)
   {
       _cache.remove(key);
   }

   public void ClearCache() 
   {
       _cache.clear();
   }

   public Object GetFromCache(String key) 
   {
       return _cache.get(key);
   }

   public void UpdateCache(String key, Object data) 
   {
       _cache.remove(key);
       _cache.put(key,data);
   }
}