public  class  threadlocal  {
　   private  map  values  =  collections.synchronizedmap(new  hashmap());
　   public  object  get()  {
　　 thread  currentthread  =  thread.currentthread();  
　   object  result  =  values.get(currentthread);  
　　   if(result  ==  null&&!values.containskey(currentthread))  {
　　　    result  =  initialvalue();
　　　    values.put(currentthread,  result);  
　　       }
　　       return  result;  
　       }
　   public  void  set(object  newvalue)  {
　　   values.put(thread.currentthread(),  newvalue);
　      }
     public  object  initialvalue()  {
　　   return  null;  
　    }
   }

public  class  hibernateutil  {
  public  static  final  sessionfactory  sessionfactory;
    static  {
      try  {
        sessionfactory  =  new  configuration().configure().buildsessionfactory();
        } catch (throwable  ex) {
          throw  new  exceptionininitializererror(ex);
           }
         }
   public static final threadlocal<session>session=new threadlocal<session>();
   public  static  session  currentsession()  throws  hibernateexception  {
       session  s  =  session.get();
       if(s  ==  null)  {
         s  =  sessionfactory.opensession();
         session.set(s);
          }
         return  s;
         }
   public  static  void  closesession()  throws  hibernateexception  {
         session  s  =  session.get();
        if(s  !=  null)  {
           s.close();
          }
          session.set(null);
        }
     }