【原创工具】JAVA后台计算两个日期之间的工作日时间差

package com.wednesday.tools.timetools;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

public class GetWorkDayTimeMillisecond {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
GetWorkDayTimeMillisecond a = new GetWorkDayTimeMillisecond();
Long b=a.getWorkdayTimeInMillis("2010-05-17 8-00-00", "2010-05-18 9-00-00", "yyyy-MM-dd HH-mm-ss");
System.out.println(b);
}
/**
* 获取两个时间之内的工作日时间（只去掉两个日期之间的周末时间，法定节假日未去掉）
* @param start -起始时间，共有3个重载方法，可以传入long型，Long型，与Date型
* @param end -结束时间，共有3个重载方法，可以传入long型，Long型，与Date型
* @return Long型时间差对象
*/
public Long getWorkdayTimeInMillis(long start, long end){
//如果起始时间大于结束时间，将二者交换
if(start>end){
long temp = start;
start = end;
end = temp;
}
//根据参数获取起始时间与结束时间的日历类型对象
Calendar sdate = Calendar.getInstance();
Calendar edate = Calendar.getInstance();
sdate.setTimeInMillis(start);
edate.setTimeInMillis(end);
//如果两个时间在同一周并且都不是周末日期，则直接返回时间差，增加执行效率
if(sdate.get(Calendar.YEAR)==edate.get(Calendar.YEAR)
&& sdate.get(Calendar.WEEK_OF_YEAR)==edate.get(Calendar.WEEK_OF_YEAR)
&& sdate.get(Calendar.DAY_OF_WEEK)!=1 && sdate.get(Calendar.DAY_OF_WEEK)!=7
&& edate.get(Calendar.DAY_OF_WEEK)!=1 && edate.get(Calendar.DAY_OF_WEEK)!=7){
return new Long(end-start);
}
//首先取得起始日期与结束日期的下个周一的日期
Calendar snextM = getNextMonday(sdate);
Calendar enextM = getNextMonday(edate);
//获取这两个周一之间的实际天数
int days = getDaysBetween(snextM, enextM);
//获取这两个周一之间的工作日数(两个周一之间的天数肯定能被7整除，并且工作日数量占其中的5/7)
int workdays = days/7*5;
//获取开始时间的偏移量
long scharge = 0;
if(sdate.get(Calendar.DAY_OF_WEEK)!=1 && sdate.get(Calendar.DAY_OF_WEEK)!=7){
//只有在开始时间为非周末的时候才计算偏移量
scharge += (7-sdate.get(Calendar.DAY_OF_WEEK))*24*3600000;
scharge -= sdate.get(Calendar.HOUR_OF_DAY)*3600000;
scharge -= sdate.get(Calendar.MINUTE)*60000;
scharge -= sdate.get(Calendar.SECOND)*1000;
scharge -= sdate.get(Calendar.MILLISECOND);
}
//获取结束时间的偏移量
long echarge = 0;
if(edate.get(Calendar.DAY_OF_WEEK)!=1 && edate.get(Calendar.DAY_OF_WEEK)!=7){
//只有在结束时间为非周末的时候才计算偏移量
echarge += (7-edate.get(Calendar.DAY_OF_WEEK))*24*3600000;
echarge -= edate.get(Calendar.HOUR_OF_DAY)*3600000;
echarge -= edate.get(Calendar.MINUTE)*60000;
echarge -= edate.get(Calendar.SECOND)*1000;
echarge -= edate.get(Calendar.MILLISECOND);
}
//计算最终结果，具体为：workdays加上开始时间的时间偏移量，减去结束时间的时间偏移量
return workdays*24*3600000+scharge-echarge;
}
public Long getWorkdayTimeInMillis(Long start, Long end){
return getWorkdayTimeInMillis(start.longValue(), end.longValue());
}
public Long getWorkdayTimeInMillis(Date start, Date end){
return getWorkdayTimeInMillis(start.getTime(), end.getTime());
}
public Long getWorkdayTimeInMillis(String start, String end, String format){
SimpleDateFormat sdf = new SimpleDateFormat(format);
Date sdate;
Date edate;
try {
sdate = sdf.parse(start);
edate = sdf.parse(end);
return getWorkdayTimeInMillis(sdate, edate);
} catch (ParseException e) {
e.printStackTrace();
return new Long(0);
}
}
private Calendar getNextMonday(Calendar cal){
int addnum=9-cal.get(Calendar.DAY_OF_WEEK);
if(addnum==8)addnum=1;//周日的情况
cal.add(Calendar.DATE, addnum);
return cal;
}
/**
* 获取两个日期之间的实际天数，支持跨年
*/
public int getDaysBetween(Calendar start, Calendar end){
if(start.after(end)){
Calendar swap = start;
start = end;
end = swap;
}
int days = end.get(Calendar.DAY_OF_YEAR)- start.get(Calendar.DAY_OF_YEAR);
int y2 = end.get(Calendar.YEAR);
if (start.get(Calendar.YEAR) != y2) {
start = (Calendar) start.clone();
do {
days += start.getActualMaximum(Calendar.DAY_OF_YEAR);
start.add(Calendar.YEAR, 1);
}while(start.get(Calendar.YEAR) != y2);
}
return days;
}

}