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();

下面有个例子，插入oralce表类型为DATE的数据

SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd HHmmss");

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

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String sql = "Insert into SM_SEND (*****************) " +

"values (*******************************

"',1," + "to_date('" +date+ "','YYYY-MM-DD HH24:MI:SS')" +

"," + "to_date('" +date+ "','YYYY-MM-DD HH24:MI:SS')" +

",0,null,null,null,null,null,null,null)";