java中String、Date、Calendar之间相互转化

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    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);
  
Calendar to DateCalendar cal=Calendar.getInstance();Date date=cal.getTime();Date to CalendarDate date=new Date();Calendar cal=Calendar.getInstance();cal.setTime(date); String to DateSimpleDateFormat sdf =   new SimpleDateFormat( " yyyy-MM-dd HH:mm:ss " );Date date = sdf.parse( " 2008-07-10 19:20:00 " );Date to String SimpleDateFormat sdf =   new SimpleDateFormat( " yyyy年MM月dd日 " );
String str = sdf.format(new Date());
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