根據某個日期獲得其上月,上季,上週的起止日期

因領導懶惰,頁面查詢條件中的日期項懶得手工輸入,查詢條件變作上月,上季,上週,故討教多方,寫了一個工具類,以作日後參考.

package util;

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

public class DateTool {

    public static long ONE_DAYS_TIME = 24*60*60*1000;//1天的毫秒數
    public static long TWO_DAYS_TIME = 2*24*60*60*1000;//2天的毫秒數
    public static long THREE_DAYS_TIME = 3*24*60*60*1000;//3天的毫秒數
    public static long FOUR_DAYS_TIME = 4*24*60*60*1000;//4天的毫秒數
    public static long FIVE_DAYS_TIME = 5*24*60*60*1000;//5天的毫秒數
    public static long SIX_DAYS_TIME = 6*24*60*60*1000;//6天的毫秒數
    public static long SEVEN_DAYS_TIME = 7*24*60*60*1000;//7天的毫秒數
    public static long EIGHT_DAYS_TIME = 8*24*60*60*1000;//8天的毫秒數
    public static long NINE_DAYS_TIME = 9*24*60*60*1000;//9天的毫秒數
    public static long TEN_DAYS_TIME = 10*24*60*60*1000;//10天的毫秒數
    public static long ELEVEN_DAYS_TIME = 11*24*60*60*1000;//11天的毫秒數
    public static long TWELVE_DAYS_TIME = 12*24*60*60*1000;//12天的毫秒數
    public static long THIRTEEN_DAYS_TIME = 13*24*60*60*1000;//13天的毫秒數
   
   / **
     * 得到某個日期上一年的年份
     * @param dateString 格式yyyyMMdd
     * @return 4位年份值
     */
    public static String getLastYear(String dateString){
        String currentYear = dateString.substring(0, 4);//該日期的所在年份
        return String.valueOf(Integer.parseInt(currentYear)-1);
    }
   
   / **
     * 得到某個日期上月的月份
     * @param dateString 格式yyyyMMdd
     * @return 2位月份值 1月份返回12
     */
    public static String getLastMonth(String dateString){
        String currentMonth = dateString.substring(4, 6);//改日期所在月份
        if("01".equals(currentMonth)){
            currentMonth = "12";
        }else if(Integer.parseInt(currentMonth)>10){
            currentMonth = String.valueOf(Integer.parseInt(currentMonth)-1);
        }else{
            currentMonth = "0"+String.valueOf(Integer.parseInt(currentMonth)-1);
        }
        return currentMonth;
    }
   
   / **
     * 得到某一日期的上個月的開始日期
     * @param dateString 格式yyyyMMdd
     * @return 8位日期值
     */
    public static String getBeginningDateOfLastMonth(String dateString) {
        String lastYear = getLastYear(dateString);//該日期上年年份
        String lastMonth = getLastMonth(dateString);//改日期上月月份
        if("12".equals(lastMonth)){
            return lastYear+lastMonth+"01";
        }else{
            return dateString.substring(0,4)+lastMonth+"01";
        }
    }
   
   / **
     * 得到某個日期上月月份的結束日期
     * @param dateString 格式yyyyMMdd
     * @return 8位日期值
     */
    public static String getEndingDateOfLastMonth(String dateString){
        String lastYear_month = getBeginningDateOfLastMonth(dateString).substring(0, 6);//該月份上月月份的年+月
        String lastYear = lastYear_month.substring(0,4);//該日期上年年份
        String lastMonth = lastYear_month.substring(4,6);//該日期上月月份
        String date = null;
        switch (Integer.parseInt(lastMonth)) {
        case 2:
            int intValueOfYear = Integer.parseInt(lastYear);
            if((intValueOfYear%4==0)||(intValueOfYear%100!=0&&intValueOfYear%400==0)){
                date = lastYear_month+"29";//閏年2月29天
            }else{
                date = lastYear_month+"28";//非閏年2月28天
            }
            break;
        case 4:
        case 6:
        case 9:
        case 11:
            date = lastYear_month+"30";//4,6,9,11月30天
            break;
        default:
            date = lastYear_month+"31";//1,3,5,7,8,10,12月31天
            break;
        }
        return date;
    }
   
   / **
     * 得到某個日期上一季度的起始月份
     * @param dateString
     * @return 2位月份值
     */
    public static String getBeginningMonthOfLastSeason(String dateString){
        String currentMonth = dateString.substring(4, 6);//當前月份
        String monthOfLastSeason = null;//上一季度起始月份
        switch(Integer.parseInt(currentMonth)){
        case 1:
        case 2:
        case 3:
            monthOfLastSeason = "10";
            break;
        case 4:
        case 5:
        case 6:
            monthOfLastSeason = "01";
            break;
        case 7:
        case 8:
        case 9:
            monthOfLastSeason = "04";
            break;
        default:
            monthOfLastSeason = "07";
            break;
        }
        return monthOfLastSeason;
    }
   
   / **
     * 得到某個日期上一季度的結束月份
     * @param dateString
     * @return 2位月份值
     */
    public static String getEndingMonthOfLastSeason(String dateString){
        String currentMonth = dateString.substring(4, 6);//當前月份
        String monthOfLastSeason = null;//上一季度結束月份
        switch(Integer.parseInt(currentMonth)){
        case 1:
        case 2:
        case 3:
            monthOfLastSeason = "12";
            break;
        case 4:
        case 5:
        case 6:
            monthOfLastSeason = "03";
            break;
        case 7:
        case 8:
        case 9:
            monthOfLastSeason = "06";
            break;
        default:
            monthOfLastSeason = "09";
            break;
        }
        return monthOfLastSeason;
    }

   / **
     * 得到某個日期上一季度的開始日期
     * @param dateString
     * @return 8位日期
     */
    public static String getBeginingDateOfLastSeason(String dateString){
        String currentYear = dateString.substring(0, 4);//該日期所在年份
        String lastYear = getLastYear(dateString);//該日期上一年年份
        String currentMonth = dateString.substring(4, 6);//該日期所在月份
        String beginningMonthOfLastSeason = getBeginningMonthOfLastSeason(dateString);//該日期上一季度起始月份
        String date = null;
        if("01".equals(currentMonth)||"02".equals(currentMonth)||"03".equals(currentMonth)){
            date = lastYear+beginningMonthOfLastSeason+"01";
        }else{
            date = currentYear+beginningMonthOfLastSeason+"01";
        }
        return date;
    }
   
   / **
     * 得到某個日期上一季度的結束日期
     * @param dateString
     * @return 8位日期
     */
    public static String getEndingDateOfLastSeason(String dateString){
        String currentYear = dateString.substring(0, 4);//該日期所在年份
        String lastYear = getLastYear(dateString);//該日期上一年年份
        String currentMonth = dateString.substring(4, 6);//該日期所在月份
        String endingMonthOfLastSeason = getEndingMonthOfLastSeason(dateString);//該日期上季度結束月份
        String date = null;
        if("01".equals(currentMonth)||"02".equals(currentMonth)||"03".equals(currentMonth)){
            switch (Integer.parseInt(endingMonthOfLastSeason)) {
            case 2:
                int intValueOfYear = Integer.parseInt(lastYear);
                if((intValueOfYear%4==0)||(intValueOfYear%100!=0&&intValueOfYear%400==0)){
                    date = lastYear+endingMonthOfLastSeason+"29";//閏年2月29天
                }else{
                    date = lastYear+endingMonthOfLastSeason+"28";//非閏年2月28天
                }
                break;
            case 4:
            case 6:
            case 9:
            case 11:
                date = lastYear+endingMonthOfLastSeason+"30";//4,6,9,11月30天
                break;
            default:
                date = lastYear+endingMonthOfLastSeason+"31";//1,3,5,7,8,10,12月31天
                break;
            }
        }else{
            switch (Integer.parseInt(endingMonthOfLastSeason)) {
            case 2:
                int intValueOfYear = Integer.parseInt(currentYear);
                if((intValueOfYear%4==0)||(intValueOfYear%100!=0&&intValueOfYear%400==0)){
                    date = currentYear+endingMonthOfLastSeason+"29";//閏年2月29天
                }else{
                    date = currentYear+endingMonthOfLastSeason+"28";//非閏年2月28天
                }
                break;
            case 4:
            case 6:
            case 9:
            case 11:
                date = currentYear+endingMonthOfLastSeason+"30";//4,6,9,11月30天
                break;
            default:
                date = currentYear+endingMonthOfLastSeason+"31";//1,3,5,7,8,10,12月31天
                break;
            }
        }
        return date;
    }
   
   / **
     * 得到某個日期上一週的起始日期(大致思路:獲得該日期的星期信息,和距離1970.1.1的毫秒數,如爲週一,將此毫秒數向前減7天的毫秒數,週二-週日依次類推)
     * @param dateString
     * @return 8位日期
     * @throws ParseException
     */
    public static String getBeginningDateOfLastWeek(String dateString) throws ParseException{
        DateFormat dateFormater = new SimpleDateFormat("yyyyMMdd");
        Date dateObject = dateFormater.parse(dateString);//將日期字符串轉換爲日期對象
        Calendar calendar = new GregorianCalendar();
        calendar.setTime(dateObject);
        int dayOfWeek = calendar.get(Calendar.DAY_OF_WEEK);//該日期的星期
        long time = dateObject.getTime();
        switch (dayOfWeek) {
        case 2:
            dateObject.setTime(time-DateTool.SEVEN_DAYS_TIME);//週一,美國和歐洲習慣把週日當作每週的第一天,故週一爲2
            break;
        case 3:
            dateObject.setTime(time-DateTool.EIGHT_DAYS_TIME);
            break;
        case 4:
            dateObject.setTime(time-DateTool.NINE_DAYS_TIME);
            break;
        case 5:
            dateObject.setTime(time-DateTool.TEN_DAYS_TIME);
            break;
        case 6:
            dateObject.setTime(time-DateTool.ELEVEN_DAYS_TIME);
            break;
        case 7:
            dateObject.setTime(time-DateTool.TWELVE_DAYS_TIME);
            break;
        default:
            dateObject.setTime(time-DateTool.THIRTEEN_DAYS_TIME);
            break;
        }
        String date = dateFormater.format(dateObject);
        return date;
       
    }
   
   / **
     * 得到某個日期上一週的結束日期
     * @param dateString
     * @return 8位日期
     * @throws ParseException
     */
    public static String getEndingDateOfLastWeek(String dateString) throws ParseException{
        DateFormat dateFormater = new SimpleDateFormat("yyyyMMdd");
        Date dateObject = dateFormater.parse(dateString);//將日期字符串轉換爲日期對象
        Calendar calendar = new GregorianCalendar();
        calendar.setTime(dateObject);
        int dayOfWeek = calendar.get(Calendar.DAY_OF_WEEK);//該日期的星期
        long time = dateObject.getTime();
        switch (dayOfWeek) {
        case 2:
            dateObject.setTime(time-DateTool.ONE_DAYS_TIME);//週一,美國和歐洲習慣把週日當作每週的第一天,故週一爲2
            break;
        case 3:
            dateObject.setTime(time-DateTool.TWO_DAYS_TIME);
            break;
        case 4:
            dateObject.setTime(time-DateTool.THREE_DAYS_TIME);
            break;
        case 5:
            dateObject.setTime(time-DateTool.FOUR_DAYS_TIME);
            break;
        case 6:
            dateObject.setTime(time-DateTool.FIVE_DAYS_TIME);
            break;
        case 7:
            dateObject.setTime(time-DateTool.SIX_DAYS_TIME);
            break;
        default:
            dateObject.setTime(time-DateTool.SEVEN_DAYS_TIME);
            break;
        }
        String date = dateFormater.format(dateObject);
        return date;
    }
}