java日历源码实现

这是本人通过java语言编写的万年日历，可能看起来好复杂！package com.lianhua.common;/** * 页面日历实体类 * @author lw * */public class CalenderEntity {private Integer a1;//ddprivate String date1;//yyyy-MM-ddprivate Integer a2;private String date2;private Integer a3;private String date3;private Integer a4;private String date4;private Integer a5;private String date5;private Integer a6;private String date6;private Integer a7;private String date7;public String getDate1() {return date1;}public void setDate1(String date1) {this.date1 = date1;}public String getDate2() {return date2;}public void setDate2(String date2) {this.date2 = date2;}public String getDate3() {return date3;}public void setDate3(String date3) {this.date3 = date3;}public String getDate4() {return date4;}public void setDate4(String date4) {this.date4 = date4;}public String getDate5() {return date5;}public void setDate5(String date5) {this.date5 = date5;}public String getDate6() {return date6;}public void setDate6(String date6) {this.date6 = date6;}public String getDate7() {return date7;}public void setDate7(String date7) {this.date7 = date7;}public Integer getA1() {return a1;}public void setA1(Integer a1) {this.a1 = a1;}public Integer getA2() {return a2;}public void setA2(Integer a2) {this.a2 = a2;}public Integer getA3() {return a3;}public void setA3(Integer a3) {this.a3 = a3;}public Integer getA4() {return a4;}public void setA4(Integer a4) {this.a4 = a4;}public Integer getA5() {return a5;}public void setA5(Integer a5) {this.a5 = a5;}public Integer getA6() {return a6;}public void setA6(Integer a6) {this.a6 = a6;}public Integer getA7() {return a7;}public void setA7(Integer a7) {this.a7 = a7;}}

日历实现类：

package com.lianhua.common;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.Calendar;import java.util.Date;import java.util.GregorianCalendar;import java.util.List;public class ViewMonth {/** 月的第一天周几 */public static int getMonthFirstDay(Calendar c, int i) {// i = 0 是本月 1 上一月// Calendar c = Calendar.getInstance();c.add(Calendar.MONTH, -i);c.set(Calendar.DAY_OF_MONTH, 1);return c.get(Calendar.DAY_OF_WEEK);}/** 月的最后一天周几 */public static int getMonthLastDay(int i, Calendar c) {// i = 0 是本月 1 上一月// Calendar c = Calendar.getInstance();c.add(Calendar.MONTH, -i);c.set(Calendar.DAY_OF_MONTH, 1);c.roll(Calendar.DAY_OF_MONTH, -1);return c.get(Calendar.DAY_OF_WEEK);}// 当天日期public static int getDay(Date date) {Calendar c = Calendar.getInstance();c.setTime(date);return c.get(Calendar.DAY_OF_MONTH);}// 当前月天数public static int getCurrentMonthDay(Calendar a) {a.set(Calendar.DATE, 1);a.roll(Calendar.DATE, -1);int maxDate = a.get(Calendar.DATE);return maxDate;}public static Calendar getDateOfLastOrNextMonth(Calendar date, int i) {Calendar date1 = (Calendar) date.clone();date1.add(Calendar.MONTH, i); // i=1 下一月的同一天 i=-1上一个月的同一天return date1;}public static Calendar getDateOfLastOrNextMonth(Date date, int i) {Calendar c = Calendar.getInstance();c.setTime(date);return getDateOfLastOrNextMonth(c, i);}// 当天周几public static int getWeek(Date date) {Calendar c = Calendar.getInstance();SimpleDateFormat d = new SimpleDateFormat("yyyy-MM-dd");// yyyy-MM-dd// Date curDate = d.parse("2015-8-7");c.setTime(date);return c.get(Calendar.DAY_OF_WEEK);}/** * 使用此方法打印该月的日历. */public static List<CalenderEntity> printMonth(Calendar c) { /* 将该月份起始处的天数留空. */// c.setTime(date);int curMonthDays = getCurrentMonthDay(c);// c.getMaximum(Calendar.DAY_OF_MONTH);//// 获取当月天数int first = getMonthFirstDay(c, 0);int last = getMonthLastDay(0, c);int before = first - 1;int after = 7 - last;int countNum = curMonthDays + before + after;int entityNum = countNum / 7;// 5int abc = 1;int days = 0;int z = 0;List<CalenderEntity> list = new ArrayList<CalenderEntity>();for (int i = 0; i < entityNum; i++) {days += 7;CalenderEntity ce = new CalenderEntity();if (i == (entityNum - 1)) {for (int jj = curMonthDays - last + 1; jj <= curMonthDays; jj++) {if (jj <= curMonthDays) {if (abc == 1) {ce.setA1(jj);ce.setDate1(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-" + jj);abc++;} else if (abc == 2) {ce.setA2(jj);ce.setDate2(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-" + jj);abc++;} else if (abc == 3) {ce.setA3(jj);ce.setDate3(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-" + jj);abc++;} else if (abc == 4) {ce.setA4(jj);ce.setDate4(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-" + jj);abc++;} else if (abc == 5) {ce.setA5(jj);ce.setDate5(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-" + jj);abc++;} else if (abc == 6) {ce.setA6(jj);ce.setDate6(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-" + jj);abc++;} else if (abc == 7) {ce.setA7(jj);ce.setDate7(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-" + jj);// abc = 1;}}}} else {for (int j = days - 6; j <= days; j++) {switch (first) {case Calendar.WEDNESDAY:// 4z = j - 3;if (z <= curMonthDays) {if (i == 0) {if (abc == 1 || abc == 2 || abc == 3) {// ce.setA1(null);// ce.setDate1(null);abc++;} else if (abc == 4) {ce.setA4(z);ce.setDate4(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 5) {ce.setA5(z);ce.setDate5(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 6) {ce.setA6(z);ce.setDate6(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 7) {ce.setA7(z);ce.setDate7(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc = 1;}} else {if (abc == 1) {ce.setA1(z);ce.setDate1(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 2) {ce.setA2(z);ce.setDate2(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 3) {ce.setA3(z);ce.setDate3(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 4) {ce.setA4(z);ce.setDate4(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 5) {ce.setA5(z);ce.setDate5(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 6) {ce.setA6(z);ce.setDate6(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 7) {ce.setA7(z);ce.setDate7(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc = 1;}}}break;case Calendar.SUNDAY:// 1z = j;if (z <= curMonthDays) {if (abc == 1) {ce.setA1(z);ce.setDate1(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-" + z);abc++;} else if (abc == 2) {ce.setA2(z);ce.setDate2(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-" + z);abc++;} else if (abc == 3) {ce.setA3(z);ce.setDate3(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-" + z);abc++;} else if (abc == 4) {ce.setA4(z);ce.setDate4(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-" + z);abc++;} else if (abc == 5) {ce.setA5(z);ce.setDate5(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-" + z);abc++;} else if (abc == 6) {ce.setA6(z);ce.setDate6(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-" + z);abc++;} else if (abc == 7) {ce.setA7(z);ce.setDate7(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-" + z);abc = 1;}}break;case Calendar.MONDAY:// 2z = j - 1;if (z <= curMonthDays) {if (i == 0) {if (abc == 1) {// ce.setA1(null);// ce.setDate1(null);abc++;} else if (abc == 2) {ce.setA2(z);ce.setDate2(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 3) {ce.setA3(z);ce.setDate3(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 4) {ce.setA4(z);ce.setDate4(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 5) {ce.setA5(z);ce.setDate5(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 6) {ce.setA6(z);ce.setDate6(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 7) {ce.setA7(z);ce.setDate7(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc = 1;}} else {if (abc == 1) {ce.setA1(z);ce.setDate1(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 2) {ce.setA2(z);ce.setDate2(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 3) {ce.setA3(z);ce.setDate3(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 4) {ce.setA4(z);ce.setDate4(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 5) {ce.setA5(z);ce.setDate5(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 6) {ce.setA6(z);ce.setDate6(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 7) {ce.setA7(z);ce.setDate7(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc = 1;}}}break;case Calendar.TUESDAY:// 3z = j - 2;if (z <= curMonthDays) {if (i == 0) {if (abc == 1 || abc == 2) {// ce.setA1(null);// ce.setDate1(null);abc++;} else if (abc == 3) {ce.setA3(z);ce.setDate3(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 4) {ce.setA4(z);ce.setDate4(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 5) {ce.setA5(z);ce.setDate5(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 6) {ce.setA6(z);ce.setDate6(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 7) {ce.setA7(z);ce.setDate7(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc = 1;}} else {if (abc == 1) {ce.setA1(z);ce.setDate1(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 2) {ce.setA2(z);ce.setDate2(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 3) {ce.setA3(z);ce.setDate3(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 4) {ce.setA4(z);ce.setDate4(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 5) {ce.setA5(z);ce.setDate5(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 6) {ce.setA6(z);ce.setDate6(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 7) {ce.setA7(z);ce.setDate7(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc = 1;}}}break;case Calendar.THURSDAY:// 5z = j - 4;if (z <= curMonthDays) {if (i == 0) {if (abc == 1 || abc == 2 || abc == 3|| abc == 4) {// ce.setA1(null);// ce.setDate1(null);abc++;} else if (abc == 5) {ce.setA5(z);ce.setDate5(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 6) {ce.setA6(z);ce.setDate6(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 7) {ce.setA7(z);ce.setDate7(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc = 1;}} else {if (abc == 1) {ce.setA1(z);ce.setDate1(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 2) {ce.setA2(z);ce.setDate2(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 3) {ce.setA3(z);ce.setDate3(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 4) {ce.setA4(z);ce.setDate4(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 5) {ce.setA5(z);ce.setDate5(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 6) {ce.setA6(z);ce.setDate6(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 7) {ce.setA7(z);ce.setDate7(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc = 1;}}}break;case Calendar.FRIDAY:// 6z = j - 5;if (z <= curMonthDays) {if (i == 0) {if (abc == 1 || abc == 2 || abc == 3|| abc == 4 || abc == 5) {// ce.setA1(null);// ce.setDate1(null);abc++;} else if (abc == 6) {ce.setA6(z);ce.setDate6(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 7) {ce.setA7(z);ce.setDate7(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc = 1;}} else {if (abc == 1) {ce.setA1(z);ce.setDate1(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 2) {ce.setA2(z);ce.setDate2(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 3) {ce.setA3(z);ce.setDate3(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);if (z == 26) {System.out.println(z);}abc++;} else if (abc == 4) {ce.setA4(z);ce.setDate4(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 5) {ce.setA5(z);ce.setDate5(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 6) {ce.setA6(z);ce.setDate6(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 7) {ce.setA7(z);ce.setDate7(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc = 1;}}}break;case Calendar.SATURDAY:// 7z = j - 6;if (z <= curMonthDays) {if (i == 0) {if (abc == 1 || abc == 2 || abc == 3|| abc == 4 || abc == 5 || abc == 6) {// ce.setA1(null);// ce.setDate1(null);abc++;} else if (abc == 7) {ce.setA7(z);ce.setDate7(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc = 1;}} else {if (abc == 1) {ce.setA1(z);ce.setDate1(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 2) {ce.setA2(z);ce.setDate2(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 3) {ce.setA3(z);ce.setDate3(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 4) {ce.setA4(z);ce.setDate4(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 5) {ce.setA5(z);ce.setDate5(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 6) {ce.setA6(z);ce.setDate6(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc++;} else if (abc == 7) {ce.setA7(z);ce.setDate7(c.get(Calendar.YEAR) + "-"+ (c.get(Calendar.MONTH) + 1) + "-"+ z);abc = 1;}}}break;}}}list.add(ce);}return list;}public static void main(String[] args) {Calendar c = Calendar.getInstance();SimpleDateFormat d = new SimpleDateFormat("yyyy-MM-dd");// yyyy-MM-dd// HH:mm:sstry {Date curDate = d.parse("2015-8-7");//输入年月日或者年月即可获取当前月的日历// System.out.println(curDate);c.setTime(curDate);// System.out.println(c.get(Calendar.DAY_OF_WEEK));/* * List<CalenderEntity> list = printMonth(curDate); * System.out.println(list.size()); for (int i = 0; i < list.size(); * i++) { * System.out.println(list.get(i).getA1()+"("+list.get(i).getDate1 * ()+")" + "\t" + * list.get(i).getA2()+"("+list.get(i).getDate2()+")" + "\t" + * list.get(i).getA3()+"("+list.get(i).getDate3()+")" + "\t" + * list.get(i).getA4()+"("+list.get(i).getDate4()+")" + "\t" + * list.get(i).getA5()+"("+list.get(i).getDate5()+")" + "\t" + * list.get(i).getA6()+"("+list.get(i).getDate6()+")" + "\t" + * list.get(i).getA7()+"("+list.get(i).getDate7()+")"); } */// System.out.println(c.get(Calendar.DAY_OF_WEEK));// System.out.println(getMonthFirstDay(0));// System.out.println(getMonthLastDay(1));/* * GregorianCalendar calendar = new GregorianCalendar(2014, 1, 29); * SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");// * 定义日期显示格式 *  * System.out.println(sdf.format(calendar.getTime()));// * 打印当前月份的下一个月份 *  * for (int i = 0; i < 1; i++) { *  * calendar.add(Calendar.MONTH, -1);// 获取上个月月份 *  * System.out.println(sdf.format(calendar.getTime()));// 输出结果 *  * } */System.out.println(getDay(new Date()));} catch (ParseException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}