java中计算任意2个日期之间的工作天数

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）* @author user**/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);DateCal app = new DateCal();Calendar cal_start = Calendar.getInstance();Calendar cal_end = Calendar.getInstance();cal_start.setTime(date_start);cal_end.setTime(date_end);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 endjava.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();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 endjava.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0charge_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0charge_end_date = etmp – 1;}//}result = (getDaysBetween(this.getNextMonday(d1), this.getNextMonday(d2)) / 7)* 5 + charge_start_date – charge_end_date;//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();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);}

}