String Date Calendar之间的转换

1.Calendar 转化 String

 Calendar calendat = Calendar.getInstance();

 SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

 String dateStr = sdf.format(calendar.getTime());

2.String 转化Calendar

 String str="2012-5-27";

 SimpleDateFormat sdf= new SimpleDateFormat("yyyy-MM-dd");

 Date date =sdf.parse(str);

 Calendar calendar = Calendar.getInstance();

 calendar.setTime(date);

3.Date 转化String

 SimpleDateFormat sdf= new SimpleDateFormat("yyyy-MM-dd");

 String dateStr=sdf.format(new Date());

4.String 转化Date

 String str="2012-5-27";

 SimpleDateFormat sdf= new SimpleDateFormat("yyyy-MM-dd");

 Date date= sdf.parse(str);

5.Date 转化Calendar

 Calendar calendar = Calendar.getInstance();

 calendar.setTime(new java.util.Date());

6.Calendar转化Date

 Calendar calendar = Calendar.getInstance();

 java.util.Date date =calendar.getTime();

7.String 转成 Timestamp

 Timestamp ts = Timestamp.valueOf("2012-1-14 08:11:00");

8.Date 转 TimeStamp

 SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

 String time = df.format(new Date());

 Timestamp ts = Timestamp.valueOf(time);