Java時間Date、Calendar、TimeStamp與字元串String之前的轉換

原文位址：https://www.cnblogs.com/qima/p/3652566.html

1.Calendar 轉化 String

Calendar calendat = Calendar.getInstance();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
String dateStr = sdf.format(calendar.getTime());           

2.String 轉化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 轉化String

SimpleDateFormat sdf= new SimpleDateFormat("yyyy-MM-dd");
String dateStr=sdf.format(new Date());            

4.String 轉化Date

String str="2012-5-27";
SimpleDateFormat sdf= new SimpleDateFormat("yyyy-MM-dd");
Date date= sdf.parse(str);            

5.Date 轉化Calendar

Calendar calendar = Calendar.getInstance();
calendar.setTime(new java.util.Date());            

6.Calendar轉化Date

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

7.String 轉成 Timestamp

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

8.Date 轉 TimeStamp

SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String time = df.format(new Date());
Timestamp ts = Timestamp.valueOf(time);