关于日期格式转换类

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/** * Title: * Description: ots * Copyright: Copyright (c) 2001 * Company: NMT * @author Colin * @version 1.0 */ import java.sql.Timestamp; import java.util.*; import java.text.*; public class FormatUtil { /** * @param Calendar * @return String 2001/12/13 Format */ public static String CalendarToStr(Calendar cal) { SimpleDateFormat format = new SimpleDateFormat("yyyy/MM/dd"); if (cal != null) { Date date = cal.getTime(); return format.format(date); } else { return ""; } } /** * @param Calendar * @return a Sunday Calendar in the Week */ public static Calendar starCalOfWeek(Calendar day) { int temp = day.get(Calendar.DAY_OF_WEEK); switch (temp) { case 1: return day; case 2: day.add(Calendar.DATE, -1); return day; case 3: day.add(Calendar.DATE, -2); return day; case 4: day.add(Calendar.DATE, -3); return day; case 5: day.add(Calendar.DATE, -4); return day; case 6: day.add(Calendar.DATE, -5); return day; case 7: day.add(Calendar.DATE, -6); return day; default: return day;; } } /** * @param Calendar * @return a Satday Calendar in the Week */ public static Calendar endCalOfWeek(Calendar day) { int temp = day.get(Calendar.DAY_OF_WEEK); switch (temp) { case 1: day.add(Calendar.DATE, 6); return day; case 2: day.add(Calendar.DATE, 5); return day; case 3: day.add(Calendar.DATE, 4); return day; case 4: day.add(Calendar.DATE, 3); return day; case 5: day.add(Calendar.DATE, 2); return day; case 6: day.add(Calendar.DATE, 1); return day; case 7: return day; default: return day;; } } public static Date StrToDate(String str) { if(str.length() == 0) { return null; } int start = str.indexOf('/'); String year = str.substring(0, start); start ; int start1 = str.indexOf('/', start); String month = str.substring(start, start1); String day = str.substring(start1 1); Date date = new Date(); Calendar cal = Calendar.getInstance(); cal.setTime(date); cal.set(Calendar.YEAR, Integer.parseInt(year)); cal.set(Calendar.MONTH, Integer.parseInt(month) - 1); cal.set(Calendar.DATE, Integer.parseInt(day)); SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd"); System.out.println(sdf.format(cal.getTime())); return cal.getTime(); } public static Calendar StrToCalendar(String str) { if(str.length() == 0) { return null; } int start = str.indexOf('/'); String year = str.substring(0, start); start ; int start1 = str.indexOf('/', start); String month = str.substring(start, start1); String day = str.substring(start1 1); Date date = new Date(); Calendar cal = Calendar.getInstance(); cal.setTime(date); cal.set(Calendar.MONTH, Integer.parseInt(month) - 1); cal.set(Calendar.DATE, Integer.parseInt(day)); return cal; } /** * @param Calendar * @return String Sun Mon etc. Format */ public static String dayOfWeek(Calendar day) { int temp = day.get(Calendar.DAY_OF_WEEK); switch (temp) { case 1: return "Sun"; case 2: return "Mon"; case 3: return "Tue"; case 4: return "Wed"; case 5: return "Thu"; case 6: return "Fri"; case 7: return "Sat"; default: return ""; } } /** * @param String Date Format 2001/12/13 * @return String Sun Mon etc. Format */ public static String dayOfWeek(String inDay) { Calendar cal = Calendar.getInstance(); cal.setTime(StrToDate(inDay)); int temp = cal.get(Calendar.DAY_OF_WEEK); switch (temp) { case 1: return "Sun"; case 2: return "Mon"; case 3: return "Tue"; case 4: return "Wed"; case 5: return "Thu"; case 6: return "Fri"; case 7: return "Sat"; default: return ""; } } public static Timestamp StrToTimestamp(String timestampStr,String pattern) throws ParseException { java.util.Date date = null; SimpleDateFormat format = new SimpleDateFormat(pattern); try { date = format.parse(timestampStr); } catch (ParseException e) { throw e; } return date == null ? null : new Timestamp(date.getTime()); } }