int userid=0;
public void attributeAdded(HttpSessionBindingEvent arg0) {
        // TODO 自动生成方法存根
        if(arg0.getSession().getAttribute("user")!=null){
            Login login=(Login)arg0.getSession().getAttribute("user");
            userid=login.getUid();
            //System.out.println(userid);
        }
    }

public boolean addLog(String log,String type){        
        boolean bool=false;
        if(userid!=0){
            Object[] parpre=new Object[4];
            parpre[0]=userid;
            parpre[1]=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date());
            parpre[2]=type;
            parpre[3]=log;
            bool=sqlhelp.executeUpdate("insert into log (managerid,datetime,acttype,loginfo) values (?,?,?,?)",parpre);
        }
        return bool;
    }