获取指定月份的工作日天数
package com.gary.util;import java.util.Calendar;/** * 日期工具 * @author gary * */public class DateUtil {/** * 计算两个日期的相隔天数 * @param d1 * @param d2 * @return */public static int getDaysBetween(Calendar d1, Calendar d2) {if (d1.after(d2)) {Calendar swap = d1;d1 = d2;d2 = swap;}int days = d2.get(Calendar.DAY_OF_YEAR) - d1.get(Calendar.DAY_OF_YEAR);int y2 = d2.get(Calendar.YEAR);if (d1.get(Calendar.YEAR) != y2) {d1 = (Calendar) d1.clone();do {days += d1.getActualMaximum(Calendar.DAY_OF_YEAR);d1.add(Calendar.YEAR, 1);} while (d1.get(Calendar.YEAR) != y2);}return days;}/** * 计算2个日期之间的工作日相隔天数 * @param d1 * @param d2 * @return */public static int getWorkingDay(Calendar d1, Calendar d2) {int result = -1;if (d1.after(d2)) {Calendar swap = d1;d1 = d2;d2 = swap;}//开始日期的日期偏移量int charge_start_date = 0;//结束日期的日期偏移量int charge_end_date = 0;// 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);// 开始日期为星期六和星期日时偏移量为0if (stmp != 0 && stmp != 6) {charge_start_date = stmp - 1;}// 结束日期为星期六和星期日时偏移量为0if (etmp != 0 && etmp != 6) {charge_end_date = etmp - 1;}result = (getDaysBetween(getNextMonday(d1), getNextMonday(d2)) / 7)* 5 + charge_start_date - charge_end_date;return result + 1;}/** * 获得日期的下一个星期一的日期 * @param date * @return */public static 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;} /** * 获取指定年-月(yyyy-mm)的工作日天数 * @param year_month * @return */public static int getWorkingDayOfMonth(String year_month){int year = Integer.parseInt(year_month.substring(0,year_month.indexOf("-")));int month = Integer.parseInt(year_month.substring(year_month.indexOf("-") + 1));Calendar start = Calendar.getInstance();start.clear();start.set(Calendar.YEAR, year);start.set(Calendar.MONTH, month - 1);start.set(Calendar.DAY_OF_MONTH, 1);Calendar end = Calendar.getInstance();end.clear();end = (Calendar) start.clone();end.add(Calendar.MONTH,1);end.add(Calendar.DAY_OF_MONTH,-1);return getWorkingDay(start,end);}/** * Test * @param args */public static void main(String[] args) {System.out.println(getWorkingDayOfMonth("2010-1"));System.out.println(getWorkingDayOfMonth("2010-02"));System.out.println(getWorkingDayOfMonth("2010-12"));}}?