获取周数、根据日期计算周 /** * 根据日期字符串判断当月第几周 * @param date_str 格式 yyyy-MM-dd * @return */ public static Integer getWeekOfMonth(String date_str){ SimpleDateFormat sdf= new SimpleDateFormat("yyyy-M
/**
* 根据日期字符串判断当月第几周
* @param date_str 格式 yyyy-MM-dd
* @return
*/
public static Integer getWeekOfMonth(String date_str){
SimpleDateFormat sdf= new SimpleDateFormat("yyyy-MM-dd");
try {
Date date =sdf.parse(date_str);
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
//第几周
int week = calendar.get(Calendar.WEEK_OF_MONTH);
//第几天，从周日开始
int day = calendar.get(Calendar.DAY_OF_WEEK);
return week;
}catch (Exception e){
return null;
}
}
/**
* 根据日期字符串获取是当年的第几周
* @param date_str 格式 yyyy-MM-dd
* @return
*/
public static Integer getWeekOfYear(String date_str) {
try {
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
Date date = format.parse(date_str);
Calendar calendar = Calendar.getInstance();
// 设置周一是一周的开始
calendar.setFirstDayOfWeek(Calendar.MONDAY);
// 每年的第一周最少有几天 odps函数 weekofyear 4天以上
calendar.setMinimalDaysInFirstWeek(4);
calendar.setTime(date);
return calendar.get(Calendar.WEEK_OF_YEAR);
} catch (Exception e) {
return null;
}
}
/**
* 获取日期所在周的周一 日期为null 则显示 当前日期的周一
* @param date_str
* @return
*/
public static String getWeekMonday(String date_str){
try {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Calendar calendar = Calendar.getInstance();
calendar.setFirstDayOfWeek(Calendar.MONDAY);
if(StringUtils.isNotEmpty(date_str)){
calendar.setTime(sdf.parse(date_str));
}
int day_of_week = calendar.get(Calendar.DAY_OF_WEEK);
if(day_of_week==1){
//周日
calendar.add(Calendar.DATE,-6);
}else{
// day_of_week ==2 周一
calendar.add(Calendar.DATE,-(day_of_week-2));
}
return sdf.format(calendar.getTime());
}catch (Exception e){
return null;
}
}
/**
* 获取上一周的周一
* @return 如 2017-11-06
*/
public static String getLastWeekMonday(){
try {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Calendar calendar = Calendar.getInstance();
int day_of_week = calendar.get(Calendar.DAY_OF_WEEK);
if(day_of_week==1){
//周日
calendar.add(Calendar.DATE,-13);
}else{
// day_of_week ==2 周一
calendar.add(Calendar.DATE,-(day_of_week+5));
}
return sdf.format(calendar.getTime());
}catch (Exception e){
return null;
}
}
/**
* 获取上一周的周日
* @return
*/
public static String getLastWeekSunday(){
try {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Calendar calendar = Calendar.getInstance();
calendar.setTime(sdf.parse(getLastWeekMonday()));
calendar.add(Calendar.DATE,+6);
return sdf.format(calendar.getTime());
}catch (Exception e){
return null;
}
}
/**
* 获取上上一周的周一
* @return 如 2017-11-06
*/
public static String getLastLastWeekMonday(){
try {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Calendar calendar = Calendar.getInstance();
int day_of_week = calendar.get(Calendar.DAY_OF_WEEK);
if(day_of_week==1){
//周日
calendar.add(Calendar.DATE,-20);
}else{
calendar.add(Calendar.DATE,-(day_of_week+12));
}
return sdf.format(calendar.getTime());
}catch (Exception e){
return null;
}
}
/**
* 获取当前日期的字符串 如 20171116
* @return
*/
public static String getCurrentTime_yyyyMMdd(){
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
return sdf.format(new Date());
}
/**
* 获取当前日期的字符串 如 20171116
* @return
*/
public static String getCurrentTime_yyyyMMddHHmmss(){
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
return sdf.format(new Date());
}
/**
* 获取当前日期的字符串 如 2017-11-22 15:12:33
* @return
*/
public static String getCurrentTime_yyyy_MM_dd_HH_mm_ss(){
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
return sdf.format(new Date());
}
/**
* 根据年、周数获取该周的具体日期
* @param year year可以为null
* @param week_no
* @return
*/
public static List
getListWeekDaysByWeekNo(Integer year,Integer week_no){
if(week_no==null){return null;}
SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd");
Calendar calendar = Calendar.getInstance();
if(year!=null){
calendar.set(Calendar.YEAR,year);
}
calendar.set(Calendar.WEEK_OF_YEAR,week_no);
calendar.setFirstDayOfWeek(Calendar.MONDAY);
// 每年的第一周最少有几天 odps函数 weekofyear 4天以上
calendar.setMinimalDaysInFirstWeek(4);
List result = new ArrayList();
calendar.set(Calendar.DAY_OF_WEEK,2);// 1表示周日，2表示周一，7表示周六
result.add(sf.format(calendar.getTime()));//周一
calendar.set(Calendar.DAY_OF_WEEK,3);
result.add(sf.format(calendar.getTime()));//周二
calendar.set(Calendar.DAY_OF_WEEK,4);
result.add(sf.format(calendar.getTime()));//周三
calendar.set(Calendar.DAY_OF_WEEK,5);
result.add(sf.format(calendar.getTime()));//周四
calendar.set(Calendar.DAY_OF_WEEK,6);
result.add(sf.format(calendar.getTime()));//周五
calendar.set(Calendar.DAY_OF_WEEK,7);
result.add(sf.format(calendar.getTime()));//周六
calendar.set(Calendar.DAY_OF_WEEK,1);
result.add(sf.format(calendar.getTime()));//周日
return result;
}
DateUtils.java
package com.albb.alarm.util;
import org.apache.commons.lang.StringUtils;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
/**
* 计算周的时候是根据 周一为每周的第一天 ， 每年的第一周最少有几天 odps函数 weekofyear 4天以上 包含4天
* Description (日期工具类)
* author: gaoxueyong
* Create at: 2017/11/23 9:46
*/
public class DateUtils {
public static void main(String[] args) {
// System.out.println("2017-01-01>>>>>>>>"+getWeekOfYear("2017-01-01"));
// System.out.println("2017-01-02>>>>>>>>"+getWeekOfYear("2017-01-02"));
//
// System.out.println("2017-11-12>>>>>>>>"+getWeekOfYear("2017-11-12"));
// System.out.println("2017-11-13>>>>>>>>"+getWeekOfYear("2017-11-13"));
//
// System.out.println("2016-05-01>>>>>>>>"+getWeekOfYear("2016-05-01"));
// System.out.println("2016-05-02>>>>>>>>"+getWeekOfYear("2016-05-02"));
//
// System.out.println("2017-12-31>>>>>>>>"+getWeekOfYear("2017-12-31"));
// System.out.println("2018-01-01>>>>>>>>"+getWeekOfYear("2018-01-01"));
//
// System.out.println("2014-12-29>>>>>>>>"+getWeekOfYear("2014-12-29")); //1
// System.out.println("2014-12-31>>>>>>>>"+getWeekOfYear("2014-12-31")); //1
// System.out.println("2015-12-29>>>>>>>>"+getWeekOfYear("2015-12-29")); //53
// System.out.println(getWeekMonday("2017-11-06"));
// System.out.println(getWeekMonday("2017-11-07"));
// System.out.println(getWeekMonday("2017-11-08"));
// System.out.println(getWeekMonday("2017-11-09"));
// System.out.println(getWeekMonday("2017-11-10"));
// System.out.println(getWeekMonday("2017-11-11"));
// System.out.println( getWeekMonday("2017-11-12"));
// System.out.println(getWeekMonday(null));
// System.out.println(getLastLastWeekMonday());
// System.out.println(getLastWeekMonday());
// System.out.println(getLastWeekSunday());
// List
list = getListWeekDaysByWeekNo(2015,1);
// for(String str:list){
// System.out.println(str);
// }
//// 获取上上周是当年的第几周
// System.out.println(getWeekOfYear(getLastLastWeekMonday()));
//// 获取上周是当年的第几周
// System.out.println(getWeekOfYear(getLastWeekMonday()));
}
/**
* 根据日期字符串判断当月第几周
* @param date_str 格式 yyyy-MM-dd
* @return
*/
public static Integer getWeekOfMonth(String date_str){
SimpleDateFormat sdf= new SimpleDateFormat("yyyy-MM-dd");
try {
Date date =sdf.parse(date_str);
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
//第几周
int week = calendar.get(Calendar.WEEK_OF_MONTH);
//第几天，从周日开始
int day = calendar.get(Calendar.DAY_OF_WEEK);
return week;
}catch (Exception e){
return null;
}
}
/**
* 根据日期字符串获取是当年的第几周
* @param date_str 格式 yyyy-MM-dd
* @return
*/
public static Integer getWeekOfYear(String date_str) {
try {
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
Date date = format.parse(date_str);
Calendar calendar = Calendar.getInstance();
// 设置周一是一周的开始
calendar.setFirstDayOfWeek(Calendar.MONDAY);
// 每年的第一周最少有几天 odps函数 weekofyear 4天以上
calendar.setMinimalDaysInFirstWeek(4);
calendar.setTime(date);
return calendar.get(Calendar.WEEK_OF_YEAR);
} catch (Exception e) {
return null;
}
}
/**
* 获取日期所在周的周一 日期为null 则显示 当前日期的周一
* @param date_str
* @return
*/
public static String getWeekMonday(String date_str){
try {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Calendar calendar = Calendar.getInstance();
calendar.setFirstDayOfWeek(Calendar.MONDAY);
if(StringUtils.isNotEmpty(date_str)){
calendar.setTime(sdf.parse(date_str));
}
int day_of_week = calendar.get(Calendar.DAY_OF_WEEK);
if(day_of_week==1){
//周日
calendar.add(Calendar.DATE,-6);
}else{
// day_of_week ==2 周一
calendar.add(Calendar.DATE,-(day_of_week-2));
}
return sdf.format(calendar.getTime());
}catch (Exception e){
return null;
}
}
/**
* 获取上一周的周一
* @return 如 2017-11-06
*/
public static String getLastWeekMonday(){
try {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Calendar calendar = Calendar.getInstance();
int day_of_week = calendar.get(Calendar.DAY_OF_WEEK);
if(day_of_week==1){
//周日
calendar.add(Calendar.DATE,-13);
}else{
// day_of_week ==2 周一
calendar.add(Calendar.DATE,-(day_of_week+5));
}
return sdf.format(calendar.getTime());
}catch (Exception e){
return null;
}
}
/**
* 获取上一周的周日
* @return
*/
public static String getLastWeekSunday(){
try {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Calendar calendar = Calendar.getInstance();
calendar.setTime(sdf.parse(getLastWeekMonday()));
calendar.add(Calendar.DATE,+6);
return sdf.format(calendar.getTime());
}catch (Exception e){
return null;
}
}
/**
* 获取上上一周的周一
* @return 如 2017-11-06
*/
public static String getLastLastWeekMonday(){
try {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Calendar calendar = Calendar.getInstance();
int day_of_week = calendar.get(Calendar.DAY_OF_WEEK);
if(day_of_week==1){
//周日
calendar.add(Calendar.DATE,-20);
}else{
calendar.add(Calendar.DATE,-(day_of_week+12));
}
return sdf.format(calendar.getTime());
}catch (Exception e){
return null;
}
}
/**
* 获取当前日期的字符串 如 20171116
* @return
*/
public static String getCurrentTime_yyyyMMdd(){
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
return sdf.format(new Date());
}
/**
* 获取当前日期的字符串 如 20171116
* @return
*/
public static String getCurrentTime_yyyyMMddHHmmss(){
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
return sdf.format(new Date());
}
/**
* 获取当前日期的字符串 如 2017-11-22 15:12:33
* @return
*/
public static String getCurrentTime_yyyy_MM_dd_HH_mm_ss(){
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
return sdf.format(new Date());
}
/**
* 根据年、周数获取该周的具体日期
* @param year year可以为null
* @param week_no
* @return
*/
public static List
getListWeekDaysByWeekNo(Integer year,Integer week_no){ if(week_no==null){return null;} SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd"); Calendar calendar = Calendar.getInstance(); if(year!=null){ calendar.set(Calendar.YEAR,year); } calendar.set(Calendar.WEEK_OF_YEAR,week_no); calendar.setFirstDayOfWeek(Calendar.MONDAY); // 每年的第一周最少有几天 odps函数 weekofyear 4天以上 calendar.setMinimalDaysInFirstWeek(4); List result = new ArrayList(); calendar.set(Calendar.DAY_OF_WEEK,2);// 1表示周日，2表示周一，7表示周六 result.add(sf.format(calendar.getTime()));//周一 calendar.set(Calendar.DAY_OF_WEEK,3); result.add(sf.format(calendar.getTime()));//周二 calendar.set(Calendar.DAY_OF_WEEK,4); result.add(sf.format(calendar.getTime()));//周三 calendar.set(Calendar.DAY_OF_WEEK,5); result.add(sf.format(calendar.getTime()));//周四 calendar.set(Calendar.DAY_OF_WEEK,6); result.add(sf.format(calendar.getTime()));//周五 calendar.set(Calendar.DAY_OF_WEEK,7); result.add(sf.format(calendar.getTime()));//周六 calendar.set(Calendar.DAY_OF_WEEK,1); result.add(sf.format(calendar.getTime()));//周日 return result; } }