Timestamp time1 = new Timestamp(System.currentTimeMillis());  
  
Timestamp time2 = new Timestamp(new Date().getTime());  
  
Timestamp time3 = new Timestamp(Calendar.getInstance().getTimeInMillis());  
  
//不建议使用  
Timestamp time4 = new Timestamp(2011-1900,11,11,11,11,11,0);