Java 输出日历格式

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;
}
}