Java 输出日历格式
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package com.wonders.task.sample.main; /** * */import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;import java.util.GregorianCalendar;/** * 一个日期处理类，在该类中，构造函数<code>DateTest()</code>,系统会默认设置年份为当年<br> * 而<code>DateTest(int year)</code>,则可以自定义年份<br> * * <pre> * DateTest date = new DateTest(); * </pre> * * or<br> * * <pre> * DateTest hd = new DateTest(2014); * </pre> * * 调用<code>printCalendar()</code>可以打印一年的日期<br> * 调用<code>printCurrentMonth()</code>可以打印当前月的日期<br> * ,当然，你也可以调用<br> * <code>printMonthOfYear()</code>设置一个参数，进行打印某个月的日期<br> * 这里提供一些参考方案:<br> * * <pre> * // 无参数，系统默认去当前年份 * DateTest date = new DateTest(); * date.printCalendar(); * date.printCurrentMonth(); * date.printMonthOfYear(4); * </pre> * * or<br> * * <pre> * // 设置为2014年 * DateTest hd = new DateTest(2014); * hd.printCurrentMonth(); * hd.printMonthOfYear(1); * </pre> * * @date 2013-4-27 * @author hongten * */public class DateTest { // MONTHS // ============================================ public static final String JANUARY = "January"; public static final String FEBUARY = "Febuary"; public static final String MARCH = "March"; public static final String APRIL = "April"; public static final String MAY = "May"; public static final String JUN = "Jun"; public static final String JULY = "July"; public static final String AUGUST = "August"; public static final String SEPTERMBER = "Septermber"; public static final String OCTOBER = "October"; public static final String NOVEMBER = "November"; public static final String DECEMBER = "December"; /** * 年份 */ private int year; /** * 一月一日星期几(eg:2013-01-01-->星期二,所以<code>whatDayOnJanuaryOne = 2;</code>) */ private int whatDayOnJanuaryOne; // main // ====================================== public static void main(String[] args) throws Exception { // 无参数，系统默认去当前年份 DateTest date = new DateTest(); date.printCalendar(); //date.printCurrentMonth(); // date.printMonthOfYear(4); // 设置为2014年 // DateTest hd = new DateTest(2014); // hd.printCurrentMonth(); // hd.printMonthOfYear(1); } // 无参数，系统默认去当前年份 public DateTest() { Calendar cal = Calendar.getInstance(); this.year = cal.get(Calendar.YEAR); try { setWhatDayOnJanuaryOne(getJanuaryOne(year)); } catch (Exception e) { e.printStackTrace(); } } // 有参数，设置年份 public DateTest(int year) { this.year = year; try { setWhatDayOnJanuaryOne(getJanuaryOne(year)); } catch (Exception e) { e.printStackTrace(); } } /** * 打印某个月的所有日期 * * @param mon * 月份 * @throws Exception */ public void printMonthOfYear(int mon) throws Exception { if (mon < 1 || mon > 12) { System.out.println("你输入的月份[" + mon + "]不对，请检查在进行...."); return; } GregorianCalendar now = new GregorianCalendar(); // 获得一个Date对象 SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); Date date = sdf.parse(year + "-" + mon + "-01"); // 设置当前时间 now.setTime(date); // 从日期中取得当前的月 int month = now.get(Calendar.MONTH); // 设置now的日期为1 now.set(Calendar.DAY_OF_MONTH, 1); // 得到now是一周的第几天 int week = now.get(Calendar.DAY_OF_WEEK); // 打印日历头部标示 System.out.println("日\t一\t二\t三\t四\t五\t六"); // 打印当前日期前面的空格 for (int i = Calendar.SUNDAY; i < week; i++) { System.out.print("\t"); } // 打印日历主体 while (now.get(Calendar.MONTH) == month) { int day = now.get(Calendar.DAY_OF_MONTH); // 对输出的日历进行对齐，小于10的加上一个空格 if (day < 10) { System.out.print(" " + day + "\t"); } else { System.out.print("" + day + "\t"); } // 如果是周六，进行换行 if (week == Calendar.SATURDAY) { System.out.println(); } // 每次输出日期后，将日期增加一天 now.add(Calendar.DAY_OF_MONTH, 1); // 重新获得一周的第几天 week = now.get(Calendar.DAY_OF_WEEK); } } /** * 打印当前月的所有日期，这个不会因用户设置的年份而改变 */ public void printCurrentMonth() { GregorianCalendar now = new GregorianCalendar(); // 获得一个Date对象 Date date = new Date(); // 设置当前时间 now.setTime(date); // 从日期中取得当前的日 int toDay = now.get(Calendar.DAY_OF_MONTH); // 从日期中取得当前的月 int month = now.get(Calendar.MONTH); // 设置now的日期为1 now.set(Calendar.DAY_OF_MONTH, 1); // 得到now是一周的第几天 int week = now.get(Calendar.DAY_OF_WEEK); // 打印日历头部标示 System.out.println("日\t一\t二\t三\t四\t五\t六"); // 打印当前日期前面的空格 for (int i = Calendar.SUNDAY; i < week; i++) { System.out.print("\t"); } // 打印日历主体 while (now.get(Calendar.MONTH) == month) { int day = now.get(Calendar.DAY_OF_MONTH); // 对输出的日历进行对齐，小于10的加上一个空格 if (day < 10) { // 如果是当前日期，加上标示 if (day == toDay) { System.out.print(":)" + day + "(:\t"); } else { System.out.print(" " + day + "\t"); } } else { // 如果是当前日期，加上标示 if (day == toDay) { System.out.print(":)" + day + "(:\t"); } else { System.out.print("" + day + "\t"); } } // 如果是周六，进行换行 if (week == Calendar.SATURDAY) { System.out.println(); } // 每次输出日期后，将日期增加一天 now.add(Calendar.DAY_OF_MONTH, 1); // 重新获得一周的第几天 week = now.get(Calendar.DAY_OF_WEEK); } } /** * 获取year这一年的一月一号是星期几 * * @param year * 年份 * @return * @throws Exception */ public int getJanuaryOne(int year) throws Exception { int[] weekDays = { 0, 1, 2, 3, 4, 5, 6 }; Calendar cal = Calendar.getInstance(); SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); Date dt = sdf.parse(year + "-01-01"); cal.setTime(dt); int w = cal.get(Calendar.DAY_OF_WEEK) - 1; if (w < 0) w = 0; return weekDays[w]; } /** * 打印一年的所有月份 */ public void printCalendar() { for (int i = 1; i <= 12; i++) { String month = getMonth(i); printTitle(month); // 打印有31天的月份 if (i == 1 || i == 3 || i == 5 || i == 7 || i == 8 || i == 10 || i == 12) { print31(); } // 打印有30天的月份 else if (i == 4 || i == 6 || i == 9 || i == 11) { print30(); } // 打印二月份 else if (i == 2) { printFebuary(); } System.out.println(); } } // 打印格式 // ============================================== start /** * 打印二月份，每一年的二月份可能不相同，所以要单独处理 */ protected void printFebuary() { if (this.year % 4 == 0) { // 闰年 printLeapYear(); } else { // 平年 printNonleapYear(); } } /** * 闰年二月份打印格式 */ private void printLeapYear() { for (int j = 1; j <= 29; j++) { String tmp = ""; if (j == 1) { for (int k = 1; k <= this.whatDayOnJanuaryOne % 7; k++) { tmp = tmp + " "; } tmp = tmp + " " + j + " "; if (this.whatDayOnJanuaryOne == 6) { System.out.println(tmp); } else { System.out.print(tmp); } } else if (j > 1 && j < 29) { if ((this.whatDayOnJanuaryOne + j) % 7 == 0) { System.out.println(" " + j); } else { if (j < 10) { System.out.print(" " + j + " "); } else { System.out.print(" " + j + " "); } } } else if (j == 29) { System.out.println(" " + j); this.whatDayOnJanuaryOne = ((this.whatDayOnJanuaryOne + j) % 7); } } } /** * 打印平年二月份格式 */ private void printNonleapYear() { for (int j = 1; j <= 28; j++) { String tmp = ""; if (j == 1) { for (int k = 1; k <= this.whatDayOnJanuaryOne % 7; k++) { tmp = tmp + " "; } tmp = tmp + " " + j + " "; if (this.whatDayOnJanuaryOne == 6) { System.out.println(tmp); } else { System.out.print(tmp); } } else if (j > 1 && j < 28) { if ((this.whatDayOnJanuaryOne + j) % 7 == 0) { System.out.println(" " + j); } else { if (j < 10) { System.out.print(" " + j + " "); } else { System.out.print(" " + j + " "); } } } else if (j == 28) { System.out.println(" " + j); this.whatDayOnJanuaryOne = ((this.whatDayOnJanuaryOne + j) % 7); } } } /** * 打印有30天的月份 */ protected void print30() { for (int j = 1; j <= 30; j++) { String tmp = ""; if (j == 1) { for (int k = 1; k <= this.whatDayOnJanuaryOne % 7; k++) { tmp = tmp + " "; } tmp = tmp + " " + j + " "; if (this.whatDayOnJanuaryOne == 6) { System.out.println(tmp); } else { System.out.print(tmp); } } else if (j > 1 && j < 30) { if ((this.whatDayOnJanuaryOne + j) % 7 == 0) { System.out.println(" " + j); } else { if (j < 10) { System.out.print(" " + j + " "); } else { System.out.print(" " + j + " "); } } } else if (j == 30) { System.out.println(" " + j); this.whatDayOnJanuaryOne = ((this.whatDayOnJanuaryOne + j) % 7); } } } /** * 打印有31天的月份 */ protected void print31() { for (int j = 1; j <= 31; j++) { String tmp = ""; if (j == 1) { for (int k = 1; k <= this.whatDayOnJanuaryOne % 7; k++) { tmp = tmp + " "; } tmp = tmp + " " + j + " "; if (this.whatDayOnJanuaryOne == 6) { System.out.println(tmp); } else { System.out.print(tmp); } } else if (j > 1 && j < 31) { if ((this.whatDayOnJanuaryOne + j) % 7 == 0) { System.out.println(" " + j); } else { if (j < 10) { System.out.print(" " + j + " "); } else { System.out.print(" " + j + " "); } } } else if (j == 31) { System.out.println(" " + j); this.whatDayOnJanuaryOne = ((this.whatDayOnJanuaryOne + j) % 7); } } } /** * 打印每个月的标题 * * @param month */ protected void printTitle(String month) { System.out.println(" " + month + " " + this.year + " "); System.out.println("---------------------------------------------"); System.out.println(" Sun Mon Tue Wed Thu Fri Sat"); } // 打印格式 // ============================================== end /** * 获取月份的英文名称 * * @param m * 月份的数字表示 * @return */ public String getMonth(int m) { String month = ""; switch (m) { case 1: month = JANUARY; break; case 2: month = FEBUARY; break; case 3: month = MARCH; break; case 4: month = APRIL; break; case 5: month = MAY; break; case 6: month = JUN; break; case 7: month = JULY; break; case 8: month = AUGUST; break; case 9: month = SEPTERMBER; break; case 10: month = OCTOBER; break; case 11: month = NOVEMBER; break; case 12: month = DECEMBER; break; } return month; } public int getYear() { return year; } public void setYear(int year) { this.year = year; } public int getWhatDayOnJanuaryOne() { return whatDayOnJanuaryOne; } public void setWhatDayOnJanuaryOne(int whatDayOnJanuaryOne) { this.whatDayOnJanuaryOne = whatDayOnJanuaryOne; }}import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.Scanner; public class 打印日历 { public static void main(String[] args) throws ParseException { Calendar cal = Calendar.getInstance(); SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); Scanner input = new Scanner(System.in); System.out.println("请输入要显示的年份"); int year = input.nextInt(); System.out.println("请输入要显示的月份"); int month = input.nextInt(); int count = getdataCount(year, month); cal.setTime(sdf.parse(year + "-" + month + "-" + 1)); int first = cal.get(Calendar.DAY_OF_WEEK); System.out.println("星期日\t星期一\t星期二\t星期三\t星期四\t星期五\t星期六"); for (int i = 1; i < first; i++) { System.out.print("\t"); } for (int i = 1; i <= count; i++) { System.out.print(i + "\t"); cal.setTime(sdf.parse(year + "-" + month + "-" + i)); if (cal.get(Calendar.DAY_OF_WEEK) == 7) { System.out.println(); } } } private static int getdataCount(int year, int month) { Calendar cal = Calendar.getInstance(); cal.set(Calendar.YEAR, year); cal.set(Calendar.MONTH, month - 1); int count = cal.getActualMaximum(Calendar.DATE); return count; } } 0 0
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