java 擷取時間到毫秒
Calendar CD = Calendar.getInstance();
int YY = CD.get(Calendar.YEAR) ;
int MM = CD.get(Calendar.MONTH)+1;
int DD = CD.get(Calendar.DATE);
int HH = CD.get(Calendar.HOUR_OF_DAY);
int NN = CD.get(Calendar.MINUTE);
int SS = CD.get(Calendar.SECOND);
int MI = CD.get(Calendar.MILLISECOND);
String timeNow = YY + "/" + MM + "/" + DD + " " + HH + "." + NN + "." + SS + "." + MI; 你可以用時間差來計算啊!
把代碼塊放在其中就是了.
線程的啟動並執行時間也是類似的
public static void testRunningTime() {
long t1 = System.currentTimeMillis();
// invoke your program here
long t2 = System.currentTimeMillis();
System.out.println("Your program has executed for "
+ (int)((t2-t1)/1000)+ " seconds "
+ ((t2-t1) % 1000) + " micro seconds");
}
/**
* 計算指定日期的上一天
*
* @param dateTime
* 日期，格式為：yyyy-MM-dd
* @return
*/
public static String getBeforeDay(String dateTime) {
Calendar now = Calendar.getInstance();
SimpleDateFormat simpledate = new SimpleDateFormat("yyyy-MM-dd");
Date date = null;
try {
date = simpledate.parse(dateTime);
} catch (ParseException ex) {
System.out.println("日期格式不符合要求：" + ex.getMessage());
return null;
}
now.setTime(date);
int year = now.get(Calendar.YEAR);
int month = now.get(Calendar.MONTH);
int day = now.get(Calendar.DAY_OF_MONTH) - 1;
now.set(year, month, day);
String time = simpledate.format(now.getTime());
return time;
}
/**
* 計算指定日期的下一天
*
* @param dateTime
* 日期，格式為：yyyy-MM-dd
* @return
*/
public static String getNextDay(String dateTime) {
Calendar now = Calendar.getInstance();
SimpleDateFormat simpledate = new SimpleDateFormat("yyyy-MM-dd");
Date date = null;
try {
date = simpledate.parse(dateTime);
} catch (ParseException ex) {
System.out.println("日期格式不符合要求：" + ex.getMessage());
return null;
}
now.setTime(date);
int year = now.get(Calendar.YEAR);
int month = now.get(Calendar.MONTH);
int day = now.get(Calendar.DAY_OF_MONTH) + 1;
now.set(year, month, day);
String time = simpledate.format(now.getTime());
return time;
}
/**
* 得到指定月的天數
* @param _year
* @param _month
* @return
*/
public static int getMaxDayOfMonth(int _year, int _month){
Calendar now = Calendar.getInstance();
int year = 0;
int month = 0;
if(_month==1){
year = _year - 1;
month = 12;
}else{
year = _year;
month = _month - 1;
}
now.set(Calendar.YEAR, year);
now.set(Calendar.MONTH, month);
return now.getActualMaximum(Calendar.DATE);
}
/**
* 計算時間差
*
* @param beginTime
* 開始時間，格式：yyyy-MM-dd HH:mm:ss
* @param endTime
* 結束時間，格式：yyyy-MM-dd HH:mm:ss
* @return 從開始時間到結束時間之間的時間差（秒）
*/
public static long getTimeDifference(String beginTime, String endTime) {
long between = 0;
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date end = null;
Date begin = null;
try {// 將截取到的時間字串轉化為時間格式的字串
end = sdf.parse(endTime);
begin = sdf.parse(beginTime);
} catch (ParseException e) {
e.printStackTrace();
}
between = (end.getTime() - begin.getTime()) / 1000;// 除以1000是為了轉換成秒
return between;
}
/**
* 計算時間差
*
* @param time
* 指定的時間，格式為：yyyy-MM-dd HH:mm:ss
* @return 目前時間和指定時間的時間差（秒）
*/
public static long getTimeDifference(String time) {
long between = 0;
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String systemTime = sdf.format(new Date()).toString();
Date end = null;
Date begin = null;
try {// 將截取到的時間字串轉化為時間格式的字串
end = sdf.parse(time);
begin = sdf.parse(systemTime);
} catch (ParseException e) {
e.printStackTrace();
}
between = Math.abs(end.getTime() - begin.getTime()) / 1000;// 除以1000是為了轉換成秒
return between;
} |
