Java中Date、String、Calendar类型之间的转化

1.Calendar 转化 String

  //获取当前时间的具体情况,如年,月,日,week,date,分,秒等

  Calendar calendat = Calendar.getInstance();

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

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

2.String 转化Calendar

  String str="2010-5-27";

  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="2010-5-27";

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

  Date birthday = 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.demo：

String转换Calendar：
  String str="2010-5-27";
  SimpleDateFormat sdf= new SimpleDateFormat("yyyy-MM-dd");
  Date date =sdf.parse(str);
  Calendar calendar = Calendar.getInstance();
  calendar.setTime(date);

Calendar转换String：
  Calendar currentCal = Calendar.getInstance();
  SimpleDateFormat currentSdf = new SimpleDateFormat("yyyy-MM-dd");
  String currentCalTime = currentSdf.format(currentCal.getTime());