请教关于linux下java类DateFormat的使用

Question

如题所述

Answer 1

1：DateDemo1类

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/*
* 取得系统的时间
*/
public class DateDemo1 {
public static void main(String args[]) {
System.out.println(System.currentTimeMillis());

}

输出为：1311060393171
执行结果会显示从1970年1月1日开始到取得系统时间为止所经过的毫秒数，例如1115346430703这个数字，但这样的数字没有人确切了解它的意 义是什么，您可以使用Date类别来让这个数字变的更有意义一些

2：DateDemo2类

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public class DateDemo2 {
@SuppressWarnings("deprecation")
public static void main(String args[]) {
Date date = new Date();

System.out.println("date.toString: " + date.toString());
System.out.println("date: " + date.getDate());
System.out.println("day: " + date.getDay());
System.out.println("hour: " + date.getHours());
System.out.println("minutes: " + date.getMinutes());
System.out.println("month: " + (date.getMonth() + 1));
System.out.println("seconds: " + date.getSeconds());
System.out.println("time: " + date.getTime());
System.out.println("timezone: " + date.getTimezoneOffset());
System.out.println("year: " + (date.getYear() + 1900));

Calendar calendar = Calendar.getInstance();
int year = calendar.get(Calendar.YEAR);
int month = calendar.get(Calendar.MONTH) + 1;
int day = calendar.get(Calendar.DATE);
int hour = calendar.get(Calendar.HOUR);
int minute = calendar.get(Calendar.MINUTE);
int second = calendar.get(Calendar.SECOND);

System.out.println("----------Calendar-------");
System.out.println("year: " + year);
System.out.println("month: " + month);
System.out.println("day: " + day);
System.out.println("hour: " + hour);
System.out.println("minute: " + minute);
System.out.println("second: " + second);

}
}
用date获得时间的值，如时、分、秒、月、日、年得方法已经过时，需要改用Calendar的方法来获取时间的值

输出结果为：

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date.toString: Tue Jul 19 15:32:42 CST 2011
date: 19
day: 2
hour: 15
minutes: 32
month: 7
seconds: 42
time: 1311060762362
timezone: -480
year: 2011
----------Calendar-------
year: 2011
month: 7
day: 19
hour: 3
minute: 32
second: 42

3：DateDemo3类

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public class DateDemo3 {
public static void main(String args[]) {
Date date = new Date();

/*
* DateFormat会依电脑上的区域设定显示时间格式，EE表示星期，MM表示月份、dd表示日期，而yyyy是西元，每个字元的设定都各有其意义
* 从Date-->String
*/
DateFormat dateFormat = new SimpleDateFormat("EE-MM-dd-yyyy");
System.out.println(dateFormat.format(date));

DateFormat format1 = new SimpleDateFormat("yyyy-MM-dd");
System.out.println(format1.format(date));

DateFormat format2 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
System.out.println(format2.format(date));

/*
* 从String-->Date
*/
String dateStr = "2011-7-19";
try {
Date dateTrans = format1.parse(dateStr);
//System.out.println(dateTrans.toString());
System.out.println(dateTrans.toLocaleString()); //转换为本地的形式
} catch (ParseException e) {
e.printStackTrace();
}

}
}
使用DateFormat来格式化日期数据，上面部分为从Date-->String，下面的部分为从String-->Date

输出结果为：

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星期二-07-19-2011
2011-07-19
2011-07-19 15:33:27
2011-7-19 0:00:00

4：DateDemo4类

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public class DateDemo4 {

public static void main(String[] args) {

Date date = new Date();
DateFormat shortFormat = DateFormat.getDateTimeInstance(DateFormat.SHORT, DateFormat.SHORT);
DateFormat mediumFormat = DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.MEDIUM);
DateFormat longFormat = DateFormat.getDateTimeInstance(DateFormat.LONG, DateFormat.LONG);
DateFormat fullFormat = DateFormat.getDateTimeInstance(DateFormat.FULL, DateFormat.FULL);

System.out.println(shortFormat.format(date));
System.out.println(mediumFormat.format(date));
System.out.println(longFormat.format(date));
System.out.println(fullFormat.format(date));

}

}

输出结果为：

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11-7-19 下午3:33
2011-7-19 15:33:54
2011年7月19日 下午03时33分54秒
2011年7月19日 星期二 下午03时33分54秒 CST

5：DateDemo5类

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public class DateDemo5 {
public static void main(String args[]) {
Date date = new Date();

Locale locale = new Locale("en", "US");

DateFormat shortDateFormat = DateFormat.getDateInstance(DateFormat.SHORT, locale);
DateFormat mediumDateFormat = DateFormat.getDateInstance(DateFormat.MEDIUM, locale);
DateFormat longDateFormat = DateFormat.getDateInstance(DateFormat.LONG, locale);
DateFormat fullDateFormat = DateFormat.getDateInstance(DateFormat.FULL, locale);

System.out.println(shortDateFormat.format(date));
System.out.println(mediumDateFormat.format(date));
System.out.println(longDateFormat.format(date));
System.out.println(fullDateFormat.format(date));

}
}

输出结果为：

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7/19/11
Jul 19, 2011
July 19, 2011
Tuesday, July 19, 2011

Answer 2

http://blog.csdn.net/woshisap/article/details/6617118