计算任意2个日期内的工作日（没有考虑到国定假日）

//package com.date.utlit;

import java.text.SimpleDateFormat;

import java.util.Calendar;

import java.util.Date;

import java.util.GregorianCalendar;

/**

* 计算任意2个日期内的工作日（没有考虑到国定假日）

*/

public class DateCal{

/**

* @param args

*/

public static void main(String[] args) {

try {

   String strDateStart = "2006-10-1";

   String strDateEnd = "2006-10-14";

   SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

   Date date_start = sdf.parse(strDateStart);

   Date date_end = sdf.parse(strDateEnd);

   Calendar cal_start = Calendar.getInstance();

   Calendar cal_end = Calendar.getInstance();

   cal_start.setTime(date_start);

   cal_end.setTime(date_end);

   DateCal app = new DateCal();

   System.out.println("星期-->" + app.getChineseWeek(cal_start)

     + " 日期-->" + cal_start.get(Calendar.YEAR) + "-"

     + (cal_start.get(Calendar.MONTH) + 1) + "-"

     + cal_start.get(Calendar.DAY_OF_MONTH));

   System.out.println("星期-->" + app.getChineseWeek(cal_end) + " 日期-->"

     + cal_end.get(Calendar.YEAR) + "-"

     + (cal_end.get(Calendar.MONTH) + 1) + "-"

     + cal_end.get(Calendar.DAY_OF_MONTH));

   System.out.println("工作日为-->"

     + app.getWorkingDay(cal_start, cal_end));

   System.out.println("休息日-->"+app.getHolidays(cal_start, cal_end));

} catch (Exception e) {

   // TODO: handle exception

}

}

public int getDaysBetween(java.util.Calendar d1, java.util.Calendar d2) {

if (d1.after(d2)) { // swap dates so that d1 is start and d2 is end

   java.util.Calendar swap = d1;

   d1 = d2;

   d2 = swap;

}

int days = d2.get(java.util.Calendar.DAY_OF_YEAR)- d1.get(java.util.Calendar.DAY_OF_YEAR);

int y2 = d2.get(java.util.Calendar.YEAR);

if (d1.get(java.util.Calendar.YEAR) != y2) {

   d1 = (java.util.Calendar) d1.clone(); //////为什么要用到clone///////

   do {

    days += d1.getActualMaximum(java.util.Calendar.DAY_OF_YEAR);

    d1.add(java.util.Calendar.YEAR, 1);

   } while (d1.get(java.util.Calendar.YEAR) != y2);

}

return days;

}

/**

* 计算2个日期之间的相隔天数

* @param d1

* @param d2

* @return

*/

public int getWorkingDay(java.util.Calendar d1, java.util.Calendar d2) {

int result = -1;

if (d1.after(d2)) { // swap dates so that d1 is start and d2 is end

   java.util.Calendar swap = d1;

   d1 = d2;

   d2 = swap;

}

int betweendays = getDaysBetween(d1, d2);

 

int charge_date = 0;

int charge_start_date = 0;//开始日期的日期偏移量

int charge_end_date = 0;//结束日期的日期偏移量

   // 日期不在同一个日期内

   int stmp;

   int etmp;

   stmp = 7 - d1.get(Calendar.DAY_OF_WEEK);

   etmp = 7 - d2.get(Calendar.DAY_OF_WEEK);

   if (stmp != 0 && stmp != 6) {// 开始日期为星期六和星期日时偏移量为0

    charge_start_date = stmp - 1;

   }

   if (etmp != 0 && etmp != 6) {// 结束日期为星期六和星期日时偏移量为0

    charge_end_date = etmp - 1;

   }

result = (getDaysBetween(this.getNextMonday(d1), this.getNextMonday(d2)) / 7)

    * 5 + charge_start_date - charge_end_date; //注意算法

//System.out.println("charge_start_date>" + charge_start_date);

//System.out.println("charge_end_date>" + charge_end_date);

//System.out.println("between day is-->" + betweendays);

return result;

}

public String getChineseWeek(Calendar date) {

final String dayNames[] = { "星期日", "星期一", "星期二", "星期三", "星期四", "星期五",

"星期六" };

int dayOfWeek = date.get(Calendar.DAY_OF_WEEK);

// System.out.println(dayNames[dayOfWeek - 1]);

return dayNames[dayOfWeek - 1];

}

/**

* 获得日期的下一个星期一的日期

* 

* @param date

* @return

*/

public Calendar getNextMonday(Calendar date) {

   Calendar result = null;

   result = date;

   do {

     result = (Calendar) result.clone(); //可能是在while中需要保持值的不变clone

     result.add(Calendar.DATE, 1);

   } while (result.get(Calendar.DAY_OF_WEEK) != 2);

   return result;

}

 

/**

* 

* @param d1

* @param d2

* @return

*/

public int getHolidays(Calendar d1,Calendar d2){

   return this.getDaysBetween(d1, d2)-this.getWorkingDay(d1, d2);

}

}