// String轉(zhuǎn)換為Date
String dateStr="2013-8-13 23:23:23";
String pattern="yyyy-MM-dd HH:mm:ss";
DateFormate dateFormat=new SimpleDateFormat(pattern);
Date date=dateFormat.parse(dateStr);
date=dateFormat.format(date);

// java.util.Date轉(zhuǎn)換為java.sql.Date
new java.sql.Date(utilDate.getTime());// 其中utilDate為java.util.Date類型的對(duì)象

// Date轉(zhuǎn)為Calendar
Date date=new Date();
Calendar calendar=Calendar.getInstance();
calendar.setTime(date);

// Calendar轉(zhuǎn)為Date
Calendar ca=Calendar.getInstance();  
Date d =(Date) ca.getTime();

// java.util.Calendar轉(zhuǎn)換為java.sql.Timestamp
new Timestamp(Calendar.getInstance().getTimeInMillis());
// java.util.Date轉(zhuǎn)換為java.sql.Timestamp
new Timestamp(date.getTime());
// String轉(zhuǎn)換為java.sql.Timestamp，String格式：yyyy-mm-dd hh:mm:ss[.f...] ，方括號(hào)表示可選
Timestamp.valueOf("2013-07-06 01:49:30");

TIMESTAMP [(fractional_seconds_precision)]
// 格式
TIMESTAMP 'YYYY-MM-DD HH24:MI:SS.FF'
// 一個(gè)例子
TIMESTAMP '1997-01-31 09:26:50.12'