思路：计算一个时间区间内工作日的天数，只要计算出这个时间区间的天数，再减去休息日的天数就可以了。但是有点麻烦的是休息日的统计，因为它不仅包括周末时间，还包括放假时间，放假还要考虑周末补班的，工作日放假休息的。

步骤：

1、把一年内的所有周末加入到假期表中。

2、把一年中所有的法定假期加入到假期表中（需等国务院公布，所以要一年跑一次维护假期表）。

3、把周末需要补班的日子从表中剔除掉。

上面还有一个细节就是法定假期里可能也有周末，所以插入前要检查避免重复插入。这样我们就得到了一张包括一年中所有假期的假期数据表了。具体实现代码如下，纯属能跑没仔细优化：

package com.util;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
import java.util.UUID;
/*** 将一年内的所有假日插入到假日表里* @author ch* @time 2016-1-15 下午6:06:11*/
public class InsertHolidayUtil {public static void main(String[] args){//驱动程序名String driver = "com.mysql.jdbc.Driver"; //要插入的数据库，表String url = "jdbc:mysql://127.0.0.1:3306/xx_web";  String user = "root"; String password = "123456";try {    //加载驱动程序Class.forName(driver);  //连续MySQL 数据库Connection conn = DriverManager.getConnection(url, user, password);if(!conn.isClosed())System.out.println("Succeeded connecting to the Database!");//statement用来执行SQL语句Statement statement = conn.createStatement();SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");java.util.Date start = sdf.parse("2016-01-01");//开始时间java.util.Date end = sdf.parse("2016-12-31");//结束时间List lists = dateSplit(start, end);//-------------------插入周末时间---------------if (!lists.isEmpty()) {for (Date date : lists) {Calendar cal = Calendar.getInstance();cal.setTime(date);if(cal.get(Calendar.DAY_OF_WEEK)==Calendar.SATURDAY||cal.get(Calendar.DAY_OF_WEEK)==Calendar.SUNDAY){System.out.println("插入日期:" + sdf.format(date) + ",周末");String insertSql = "INSERT INTO fn_all_holiday (id,title,holiday_date) VALUES('"+UUID.randomUUID()+"',"+"'周末','"+sdf.format(date)+"')";statement.executeUpdate(insertSql);}}}//---------------插入节假日时间------------------List holidays = new ArrayList();holidays.add(new Days(UUID.randomUUID().toString(),"元旦", sdf.parse("2016-01-01")));holidays.add(new Days(UUID.randomUUID().toString(),"元旦", sdf.parse("2016-01-02")));holidays.add(new Days(UUID.randomUUID().toString(),"元旦", sdf.parse("2016-01-03")));holidays.add(new Days(UUID.randomUUID().toString(),"春节", sdf.parse("2016-02-07")));holidays.add(new Days(UUID.randomUUID().toString(),"春节", sdf.parse("2016-02-08")));holidays.add(new Days(UUID.randomUUID().toString(),"春节", sdf.parse("2016-02-09")));holidays.add(new Days(UUID.randomUUID().toString(),"春节", sdf.parse("2016-02-10")));holidays.add(new Days(UUID.randomUUID().toString(),"春节", sdf.parse("2016-02-11")));holidays.add(new Days(UUID.randomUUID().toString(),"春节", sdf.parse("2016-02-12")));holidays.add(new Days(UUID.randomUUID().toString(),"春节", sdf.parse("2016-02-13")));holidays.add(new Days(UUID.randomUUID().toString(),"清明节", sdf.parse("2016-04-02")));holidays.add(new Days(UUID.randomUUID().toString(),"清明节", sdf.parse("2016-04-03")));holidays.add(new Days(UUID.randomUUID().toString(),"清明节", sdf.parse("2016-04-04")));holidays.add(new Days(UUID.randomUUID().toString(),"劳动节", sdf.parse("2016-04-30")));holidays.add(new Days(UUID.randomUUID().toString(),"劳动节", sdf.parse("2016-05-01")));holidays.add(new Days(UUID.randomUUID().toString(),"劳动节", sdf.parse("2016-05-02")));holidays.add(new Days(UUID.randomUUID().toString(),"端午节", sdf.parse("2016-06-09")));holidays.add(new Days(UUID.randomUUID().toString(),"端午节", sdf.parse("2016-06-10")));holidays.add(new Days(UUID.randomUUID().toString(),"端午节", sdf.parse("2016-06-11")));holidays.add(new Days(UUID.randomUUID().toString(),"中秋节", sdf.parse("2016-09-15")));holidays.add(new Days(UUID.randomUUID().toString(),"中秋节", sdf.parse("2016-09-16")));holidays.add(new Days(UUID.randomUUID().toString(),"中秋节", sdf.parse("2016-09-17")));holidays.add(new Days(UUID.randomUUID().toString(),"国庆节", sdf.parse("2016-10-01")));holidays.add(new Days(UUID.randomUUID().toString(),"国庆节", sdf.parse("2016-10-02")));holidays.add(new Days(UUID.randomUUID().toString(),"国庆节", sdf.parse("2016-10-03")));holidays.add(new Days(UUID.randomUUID().toString(),"国庆节", sdf.parse("2016-10-04")));holidays.add(new Days(UUID.randomUUID().toString(),"国庆节", sdf.parse("2016-10-05")));holidays.add(new Days(UUID.randomUUID().toString(),"国庆节", sdf.parse("2016-10-06")));holidays.add(new Days(UUID.randomUUID().toString(),"国庆节", sdf.parse("2016-10-07")));for(Days day:holidays) {//跟周末冲突的，不重复插入String sql = "select count(1) as numbers from fn_all_holiday where holiday_date ='" + sdf.format(day.getDate()) + "'";//结果集ResultSet rs = statement.executeQuery(sql);boolean hasRecord = false;while(rs.next()) {if(!"0".equals(rs.getString("numbers"))) {hasRecord = true;}}if(!hasRecord) {System.out.println("插入日期：" + sdf.format(day.getDate()) + "," + day.getTitle());String insertSql = "INSERT INTO fn_all_holiday (id,title,holiday_date) VALUES('"+day.getId()+"',"+"'"+day.getTitle()+"','"+sdf.format(day.getDate())+"')";statement.executeUpdate(insertSql);}}//-------------- 剔除补班时间(周末需要补班的)---------------------List workDays = new ArrayList();workDays.add(new Days(UUID.randomUUID().toString(),"补班", sdf.parse("2016-02-06")));workDays.add(new Days(UUID.randomUUID().toString(),"补班", sdf.parse("2016-02-14")));workDays.add(new Days(UUID.randomUUID().toString(),"补班", sdf.parse("2016-06-12")));workDays.add(new Days(UUID.randomUUID().toString(),"补班", sdf.parse("2016-09-18")));workDays.add(new Days(UUID.randomUUID().toString(),"补班", sdf.parse("2016-10-08")));workDays.add(new Days(UUID.randomUUID().toString(),"补班", sdf.parse("2016-10-09")));for(Days day:workDays) {System.out.println("剔除日期：" + sdf.format(day.getDate()) + "," + day.getTitle());String delSql = "delete from fn_all_holiday where holiday_date ='" + sdf.format(day.getDate()) + "'";statement.executeUpdate(delSql);}conn.close();}catch(ClassNotFoundException e) { System.out.println("Sorry,can't find the Driver!");e.printStackTrace();}catch(SQLException e) {e.printStackTrace();}catch(Exception e) {  e.printStackTrace(); }}private static List dateSplit(java.util.Date start, Date end)throws Exception {if (!start.before(end))throw new Exception("开始时间应该在结束时间之后");Long spi = end.getTime() - start.getTime();Long step = spi / (24 * 60 * 60 * 1000);// 相隔天数List dateList = new ArrayList();dateList.add(end);for (int i = 1; i <= step; i++) {dateList.add(new Date(dateList.get(i - 1).getTime()- (24 * 60 * 60 * 1000)));// 比上一天减一}return dateList;}}

package com.util;import java.util.Date;public class Days {private String id;private String title;private Date date;public Days(String id,String title,Date date) {this.id = id;this.title = title;this.date = date;}public String getId() {return id;}public void setId(String id) {this.id = id;}public String getTitle() {return title;}public void setTitle(String title) {this.title = title;}public Date getDate() {return date;}public void setDate(Date date) {this.date = date;}}