Java8中为月份和星期新增的了，Month和DayOfWeek，来处理月份和星期的特殊问题，这2个类都是枚举类，对Month、DayOfWeek源码说明和简单应用，月份英文，月份英文简称，月份中文，星期英文，星期英文简称，星期中文等。
1.Month
1.1 部分源码：
* @implSpec
* This is an immutable and thread-safe enum.
*
* @since 1.8
*/
public enum Month implements TemporalAccessor, TemporalAdjuster {
/**
* The singleton instance for the month of January with 31 days.
* This has the numeric value of {@code 1}.
*/
JANUARY,
/**
* The singleton instance for the month of February with 28 days, or 29 in a leap year.
* This has the numeric value of {@code 2}.
*/
FEBRUARY,
/**
* The singleton instance for the month of March with 31 days.
* This has the numeric value of {@code 3}.
*/
MARCH,
/**
* The singleton instance for the month of April with 30 days.
* This has the numeric value of {@code 4}.
*/
APRIL,
从中可以看出包含了12个月，因为实现了TemporalAccessor和TemporalAdjuster接口，它既有了属性读取和设置，又有加减等功能如下：
2.应用
为了方便中文环境应用，加一个月份名称的枚举。
package com.xkzhangsan.time.enums;
/**
* 月份名称枚举，包含英文全称，英文检查，中文全称
*
* @ClassName: MonthNameEnum
* @Description: MonthNameEnum
* @author xkzhangsan
* @date 2020年02月27日
*/
public enum MonthNameEnum {
Jan(1, "January", "一月", "一"),
Feb(2, "February", "二月", "二"),
Mar(3, "March", "三月", "三"),
Apr(4, "April", "四月", "四"),
May(5, "May", "五月", "五"),
Jun(6, "June", "六月", "六"),
Jul(7, "July", "七月", "七"),
Aug(8, "August", "八月", "八"),
Sep(9, "September", "九月", "九"),
Oct(10, "October", "十月", "十"),
Nov(11, "November", "十一月", "十一"),
Dec(12, "December", "十二月", "十二"),;
/**
* 序号
*/
private int code;
/**
* 英文全称
*/
private String fullNameEn;
/**
* 中文全称
*/
private String fullNameCn;
/**
* 中文简称
*/
private String shortNameCn;
private MonthNameEnum(int code, String fullNameEn, String fullNameCn, String shortNameCn) {
this.code = code;
this.fullNameEn = fullNameEn;
this.fullNameCn = fullNameCn;
this.shortNameCn = shortNameCn;
}
/**
* 根据code查询月份名称枚举
* @param code
* @return
*/
public static MonthNameEnum getByCode(int code){
if(code >=1 && code <= 12){
for(MonthNameEnum monthNameEnum : MonthNameEnum.values()){
if(monthNameEnum.getCode() == code){
return monthNameEnum;
}
}
}
return null;
}
/**
* 根据code查询月份英文简称
* @param code
* @return
*/
public static String getShortNameEnByCode(int code){
MonthNameEnum monthNameEnum = getByCode(code);
return monthNameEnum != null ? monthNameEnum.name() : null;
}
/**
* 根据code查询月份英文全称
* @param code
* @return
*/
public static String getFullNameEnByCode(int code){
MonthNameEnum monthNameEnum = getByCode(code);
return monthNameEnum != null ? monthNameEnum.getFullNameEn() : null;
}
/**
* 根据code查询月份中文全称
* @param code
* @return
*/
public static String getFullNameCnByCode(int code){
MonthNameEnum monthNameEnum = getByCode(code);
return monthNameEnum != null ? monthNameEnum.getFullNameCn() : null;
}
/**
* 根据code查询月份中文
* @param code
* @return
*/
public static String getShortNameCnByCode(int code){
MonthNameEnum monthNameEnum = getByCode(code);
return monthNameEnum != null ? monthNameEnum.getShortNameCn() : null;
}
public int getCode() {
return code;
}
public String getFullNameEn() {
return fullNameEn;
}
public String getFullNameCn() {
return fullNameCn;
}
public String getShortNameCn() {
return shortNameCn;
}
}
应用代码
/**
* 获取月， 比如 1
* @param date
* @return
*/
public static int getMonth(Date date){
return DateTimeConverterUtil.toLocalDateTime(date).getMonthValue();
}
/**
* 获取月， 比如 1
* @param instant
* @return
*/
public static int getMonth(Instant instant){
return DateTimeConverterUtil.toLocalDateTime(instant).getMonthValue();
}
/**
* 获取月， 比如 1
* LocalDateTime LocalDate ZonedDateTime 可以直接getMonthValue()
* @param localDateTime
* @return
*/
public static int getMonth(LocalDateTime localDateTime){
Objects.requireNonNull(localDateTime, "localDateTime");
return localDateTime.getMonthValue();
}
/**
* 获取月英文全称， 比如 January
* January, February, March, April, May, June, July, August, September, October,
* November and December
* @param date
* @return
*/
public static String getMonthEnLong(Date date){
return MonthNameEnum.getFullNameEnByCode(getMonth(date));
}
/**
* 获取月英文全称， 比如 January
* January, February, March, April, May, June, July, August, September, October,
* November and December
* @param instant
* @return
*/
public static String getMonthEnLong(Instant instant){
return MonthNameEnum.getFullNameEnByCode(getMonth(instant));
}
/**
* 获取月英文全称， 比如 January
* January, February, March, April, May, June, July, August, September, October,
* November and December
* LocalDateTime LocalDate ZonedDateTime 可以直接.getMonth().toString()
* @param localDateTime
* @return
*/
public static String getMonthEnLong(LocalDateTime localDateTime){
Objects.requireNonNull(localDateTime, "localDateTime");
return MonthNameEnum.getFullNameEnByCode(getMonth(localDateTime));
}
/**
* 获取月英文简称， 比如 Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec
* @param date
* @return
*/
public static String getMonthEnShort(Date date){
return MonthNameEnum.getShortNameEnByCode(getMonth(date));
}
/**
* 获取月英文简称， 比如 Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec
* @param instant
* @return
*/
public static String getMonthEnShort(Instant instant){
return MonthNameEnum.getShortNameEnByCode(getMonth(instant));
}
/**
* 获取月英文简称， 比如 Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec
* @param localDateTime
* @return
*/
public static String getMonthEnShort(LocalDateTime localDateTime){
Objects.requireNonNull(localDateTime, "localDateTime");
return MonthNameEnum.getShortNameEnByCode(getMonth(localDateTime));
}
/**
* 获取月份中文全称， 比如一月
* @param date
* @return
*/
public static String getMonthCnLong(Date date){
return MonthNameEnum.getFullNameCnByCode(getMonth(date));
}
/**
* 获取月份中文全称， 比如一月
* @param instant
* @return
*/
public static String getMonthCnLong(Instant instant){
return MonthNameEnum.getFullNameCnByCode(getMonth(instant));
}
/**
* 获取月份中文全称， 比如一月
* @param localDateTime
* @return
*/
public static String getMonthCnLong(LocalDateTime localDateTime){
Objects.requireNonNull(localDateTime, "localDateTime");
return MonthNameEnum.getFullNameCnByCode(getMonth(localDateTime));
}
/**
* 获取月份中文全称， 比如一
* @param date
* @return
*/
public static String getMonthCnShort(Date date){
return MonthNameEnum.getShortNameCnByCode(getMonth(date));
}
/**
* 获取月份中文全称， 比如一
* @param instant
* @return
*/
public static String getMonthCnShort(Instant instant){
return MonthNameEnum.getShortNameCnByCode(getMonth(instant));
}
/**
* 获取月份中文全称， 比如一
* @param localDateTime
* @return
*/
public static String getMonthCnShort(LocalDateTime localDateTime){
Objects.requireNonNull(localDateTime, "localDateTime");
return MonthNameEnum.getShortNameCnByCode(getMonth(localDateTime));
}
测试代码：
/**
* 获取月份信息，包括英文全称简称，中文等
*/
@Test
public void dateGetMonthTest(){
Date date = new Date();
System.out.println(date);
System.out.println(DateTimeCalculatorUtil.getMonth(date));
System.out.println(DateTimeCalculatorUtil.getMonthEnLong(date));
System.out.println(DateTimeCalculatorUtil.getMonthEnShort(date));
System.out.println(DateTimeCalculatorUtil.getMonthCnLong(date));
System.out.println(DateTimeCalculatorUtil.getMonthCnShort(date));
}
输出结果：
Thu Feb 27 16:01:59 CST 2020
2
February
Feb
二月
二
2.DayOfWeek
2.1 部分源码
* @implSpec
* This is an immutable and thread-safe enum.
*
* @since 1.8
*/
public enum DayOfWeek implements TemporalAccessor, TemporalAdjuster {
/**
* The singleton instance for the day-of-week of Monday.
* This has the numeric value of {@code 1}.
*/
MONDAY,
/**
* The singleton instance for the day-of-week of Tuesday.
* This has the numeric value of {@code 2}.
*/
TUESDAY,
/**
* The singleton instance for the day-of-week of Wednesday.
* This has the numeric value of {@code 3}.
*/
WEDNESDAY,
/**
* The singleton instance for the day-of-week of Thursday.
* This has the numeric value of {@code 4}.
*/
THURSDAY,
/**
* The singleton instance for the day-of-week of Friday.
* This has the numeric value of {@code 5}.
*/
FRIDAY,
/**
* The singleton instance for the day-of-week of Saturday.
* This has the numeric value of {@code 6}.
*/
SATURDAY,
/**
* The singleton instance for the day-of-week of Sunday.
* This has the numeric value of {@code 7}.
*/
SUNDAY;
从中可以看出包含了星期一到星期日，因为实现了TemporalAccessor和TemporalAdjuster接口，它它既有了属性读取和设置，又有加减等功能如下：
2.2 应用
为了方便中文环境应用，加一个星期名称的枚举。
package com.xkzhangsan.time.enums;
/**
* 星期名称枚举，包含英文全称，英文检查，中文
* Monday, Tuesday, Wednesday, Thursday, Friday, Saturday and Sunday
* @ClassName: WeekNameEnum
* @Description: WeekNameEnum
* @author xkzhangsan
* @date 2020年02月27日
*/
public enum WeekNameEnum {
Mon(1, "Monday", "星期一"),
Tue(2, "Tuesday", "星期二"),
Wed(3, "Wednesday", "星期三"),
Thu(4, "Thursday", "星期四"),
Fri(5, "Friday", "星期五"),
Sat(6, "Saturday", "星期六"),
Sun(7, "Sunday", "星期日"),;
/**
* 序号
*/
private int code;
/**
* 英文全称
*/
private String fullNameEn;
/**
* 中文
*/
private String nameCn;
private WeekNameEnum(int code, String fullNameEn, String nameCn) {
this.code = code;
this.fullNameEn = fullNameEn;
this.nameCn = nameCn;
}
/**
* 根据code查询星期名称枚举
* @param code
* @return
*/
public static WeekNameEnum getByCode(int code){
if(code >=1 && code <= 12){
for(WeekNameEnum monthNameEnum : WeekNameEnum.values()){
if(monthNameEnum.getCode() == code){
return monthNameEnum;
}
}
}
return null;
}
/**
* 根据code查询星期英文简称
* @param code
* @return
*/
public static String getShortNameEnByCode(int code){
WeekNameEnum monthNameEnum = getByCode(code);
return monthNameEnum != null ? monthNameEnum.name() : null;
}
/**
* 根据code查询星期英文全称
* @param code
* @return
*/
public static String getFullNameEnByCode(int code){
WeekNameEnum monthNameEnum = getByCode(code);
return monthNameEnum != null ? monthNameEnum.getFullNameEn() : null;
}
/**
* 根据code查询星期中文名称
* @param code
* @return
*/
public static String getNameCnByCode(int code){
WeekNameEnum monthNameEnum = getByCode(code);
return monthNameEnum != null ? monthNameEnum.getNameCn() : null;
}
public int getCode() {
return code;
}
public String getFullNameEn() {
return fullNameEn;
}
public String getNameCn() {
return nameCn;
}
}
应用代码：
/**
* 获取星期值 1-7，星期一到星期日
* @param date
* @return
*/
public static int getDayOfWeek(Date date){
return DateTimeConverterUtil.toLocalDateTime(date).getDayOfWeek().getValue();
}
/**
* 获取星期值 1-7，星期一到星期日
* @param localDateTime
* @return
*/
public static int getDayOfWeek(LocalDateTime localDateTime){
Objects.requireNonNull(localDateTime, "localDateTime");
return localDateTime.getDayOfWeek().getValue();
}
/**
* 获取星期值 1-7，星期一到星期日
* @param localDate
* @return
*/
public static int getDayOfWeek(LocalDate localDate){
Objects.requireNonNull(localDate, "localDate");
return localDate.getDayOfWeek().getValue();
}
/**
* 获取星期值 1-7，星期一到星期日
* @param instant
* @return
*/
public static int getDayOfWeek(Instant instant){
return DateTimeConverterUtil.toLocalDateTime(instant).getDayOfWeek().getValue();
}
/**
* 获取星期英文全称，比如Monday, Tuesday, Wednesday, Thursday, Friday, Saturday and Sunday
* @param date
* @return
*/
public static String getDayOfWeekEnLong(Date date){
return WeekNameEnum.getFullNameEnByCode(getDayOfWeek(date));
}
/**
* 获取星期英文全称，比如Monday, Tuesday, Wednesday, Thursday, Friday, Saturday and Sunday
* @param localDateTime
* @return
*/
public static String getDayOfWeekEnLong(LocalDateTime localDateTime){
Objects.requireNonNull(localDateTime, "localDateTime");
return WeekNameEnum.getFullNameEnByCode(getDayOfWeek(localDateTime));
}
/**
* 获取星期英文全称，比如Monday, Tuesday, Wednesday, Thursday, Friday, Saturday and Sunday
* @param localDate
* @return
*/
public static String getDayOfWeekEnLong(LocalDate localDate){
Objects.requireNonNull(localDate, "localDate");
return WeekNameEnum.getFullNameEnByCode(getDayOfWeek(localDate));
}
/**
* 获取星期英文全称，比如Monday, Tuesday, Wednesday, Thursday, Friday, Saturday and Sunday
* @param instant
* @return
*/
public static String getDayOfWeekEnLong(Instant instant){
return WeekNameEnum.getFullNameEnByCode(getDayOfWeek(instant));
}
/**
* 获取星期英文简称，比如Mon
* @param date
* @return
*/
public static String getDayOfWeekEnShort(Date date){
return WeekNameEnum.getShortNameEnByCode(getDayOfWeek(date));
}
/**
* 获取星期英文简称，比如Mon
* @param localDateTime
* @return
*/
public static String getDayOfWeekEnShort(LocalDateTime localDateTime){
Objects.requireNonNull(localDateTime, "localDateTime");
return WeekNameEnum.getShortNameEnByCode(getDayOfWeek(localDateTime));
}
/**
* 获取星期英文简称，比如Mon
* @param localDate
* @return
*/
public static String getDayOfWeekEnShort(LocalDate localDate){
Objects.requireNonNull(localDate, "localDate");
return WeekNameEnum.getShortNameEnByCode(getDayOfWeek(localDate));
}
/**
* 获取星期英文简称，比如Mon
* @param instant
* @return
*/
public static String getDayOfWeekEnShort(Instant instant){
return WeekNameEnum.getShortNameEnByCode(getDayOfWeek(instant));
}
/**
* 获取星期中文，比如星期一
* @param date
* @return
*/
public static String getDayOfWeekCn(Date date){
return WeekNameEnum.getNameCnByCode(getDayOfWeek(date));
}
/**
* 获取星期中文，比如星期一
* @param localDateTime
* @return
*/
public static String getDayOfWeekCn(LocalDateTime localDateTime){
Objects.requireNonNull(localDateTime, "localDateTime");
return WeekNameEnum.getNameCnByCode(getDayOfWeek(localDateTime));
}
/**
* 获取星期中文，比如星期一
* @param localDate
* @return
*/
public static String getDayOfWeekCn(LocalDate localDate){
Objects.requireNonNull(localDate, "localDate");
return WeekNameEnum.getNameCnByCode(getDayOfWeek(localDate));
}
/**
* 获取星期中文，比如星期一
* @param instant
* @return
*/
public static String getDayOfWeekCn(Instant instant){
return WeekNameEnum.getNameCnByCode(getDayOfWeek(instant));
}
测试代码：
/**
* 获取星期信息，包括英文全称简称，中文等
*/
@Test
public void dateGetWeekTest(){
Date date = new Date();
System.out.println(date);
System.out.println(DateTimeCalculatorUtil.getDayOfWeek(date));
System.out.println(DateTimeCalculatorUtil.getDayOfWeekEnLong(date));
System.out.println(DateTimeCalculatorUtil.getDayOfWeekEnShort(date));
System.out.println(DateTimeCalculatorUtil.getDayOfWeekCn(date));
}
输出:
Thu Feb 27 16:09:00 CST 2020
4
Thursday
Thu
星期四
源代码地址：https://github.com/xkzhangsan/xk-time
