Date工具类

谁践踏了优雅 2022-07-27 13:36 189阅读 0赞

`import`  `java.text.ParsePosition;`

`import`  `java.text.SimpleDateFormat;`

`import`  `java.util.Calendar;`

`import`  `java.util.` `Date` `;`

`import`  `java.util.GregorianCalendar;`

`import`  `java.util.regex.Pattern;`

`          `

`import`  `org.apache.commons.logging.Log;`

`import`  `org.apache.commons.logging.LogFactory;`

`          `

`public`  `class`  `DateUtil {`

`  ` `protected`  `static`  `Log logger = LogFactory.getLog(DateUtil.` `class` `);`

`          `

`  ` `// 格式：年－月－日 小时：分钟：秒`

`  ` `public`  `static`  `final`  `String`  `FORMAT_ONE = ` `"yyyy-MM-dd HH:mm:ss"` `;`

`          `

`  ` `// 格式：年－月－日 小时：分钟`

`  ` `public`  `static`  `final`  `String`  `FORMAT_TWO = ` `"yyyy-MM-dd HH:mm"` `;`

`          `

`  ` `// 格式：年月日 小时分钟秒`

`  ` `public`  `static`  `final`  `String`  `FORMAT_THREE = ` `"yyyyMMdd-HHmmss"` `;`

`          `

`  ` `// 格式：年－月－日`

`  ` `public`  `static`  `final`  `String`  `LONG_DATE_FORMAT = ` `"yyyy-MM-dd"` `;`

`          `

`  ` `// 格式：月－日`

`  ` `public`  `static`  `final`  `String`  `SHORT_DATE_FORMAT = ` `"MM-dd"` `;`

`          `

`  ` `// 格式：小时：分钟：秒`

`  ` `public`  `static`  `final`  `String`  `LONG_TIME_FORMAT = ` `"HH:mm:ss"` `;`

`          `

`  ` `//格式：年-月`

`  ` `public`  `static`  `final`  `String`  `MONTG_DATE_FORMAT = ` `"yyyy-MM"` `;`

`          `

`  ` `// 年的加减`

`  ` `public`  `static`  `final`  `int`  `SUB_YEAR = Calendar.YEAR;`

`          `

`  ` `// 月加减`

`  ` `public`  `static`  `final`  `int`  `SUB_MONTH = Calendar.MONTH;`

`          `

`  ` `// 天的加减`

`  ` `public`  `static`  `final`  `int`  `SUB_DAY = Calendar.DATE;`

`          `

`  ` `// 小时的加减`

`  ` `public`  `static`  `final`  `int`  `SUB_HOUR = Calendar.HOUR;`

`          `

`  ` `// 分钟的加减`

`  ` `public`  `static`  `final`  `int`  `SUB_MINUTE = Calendar.MINUTE;`

`          `

`  ` `// 秒的加减`

`  ` `public`  `static`  `final`  `int`  `SUB_SECOND = Calendar.SECOND;`

`          `

`  ` `static`  `final`  `String`  `dayNames[] = { ` `"星期日"` `, ` `"星期一"` `, ` `"星期二"` `, ` `"星期三"` `,` `"星期四"` `,`

`      ` `"星期五"` `, ` `"星期六"`  `};`

`          `

`  ` `@SuppressWarnings(` `"unused"` `)`

`  ` `private`  `static`  `final`  `SimpleDateFormat timeFormat = ` `new`  `SimpleDateFormat(`

`      ` `"yyyy-MM-dd HH:mm:ss"` `);`

`          `

`  ` `public`  `DateUtil() {`

`  ` `}`

`          `

`  ` `/**`

`   ` `* 把符合日期格式的字符串转换为日期类型`

`   ` `*/`

`  ` `public`  `static`  `java.util.` `Date`  `stringtoDate(` `String`  `dateStr, ` `String`  `format) {`

`    ` `Date`  `d = ` `null` `;`

`    ` `SimpleDateFormat formater = ` `new`  `SimpleDateFormat(format);`

`    ` `try`  `{`

`      ` `formater.setLenient(` `false` `);`

`      ` `d = formater.parse(dateStr);`

`    ` `} ` `catch`  `(Exception e) {`

`      ` `// log.error(e);`

`      ` `d = ` `null` `;`

`    ` `}`

`    ` `return`  `d;`

`  ` `}`

`          `

`  ` `/**`

`   ` `* 把符合日期格式的字符串转换为日期类型`

`   ` `*/`

`  ` `public`  `static`  `java.util.` `Date`  `stringtoDate(` `String`  `dateStr, ` `String`  `format,`

`      ` `ParsePosition pos) {`

`    ` `Date`  `d = ` `null` `;`

`    ` `SimpleDateFormat formater = ` `new`  `SimpleDateFormat(format);`

`    ` `try`  `{`

`      ` `formater.setLenient(` `false` `);`

`      ` `d = formater.parse(dateStr, pos);`

`    ` `} ` `catch`  `(Exception e) {`

`      ` `d = ` `null` `;`

`    ` `}`

`    ` `return`  `d;`

`  ` `}`

`          `

`  ` `/**`

`   ` `* 把日期转换为字符串`

`   ` `*/`

`  ` `public`  `static`  `String`  `dateToString(java.util.` `Date`  `date, ` `String`  `format) {`

`    ` `String`  `result = ` `""` `;`

`    ` `SimpleDateFormat formater = ` `new`  `SimpleDateFormat(format);`

`    ` `try`  `{`

`      ` `result = formater.format(date);`

`    ` `} ` `catch`  `(Exception e) {`

`      ` `// log.error(e);`

`    ` `}`

`    ` `return`  `result;`

`  ` `}`

`          `

`  ` `/**`

`   ` `* 获取当前时间的指定格式`

`   ` `*/`

`  ` `public`  `static`  `String`  `getCurrDate(` `String`  `format) {`

`    ` `return`  `dateToString(` `new`  `Date` `(), format);`

`  ` `}`

`          `

`  ` `public`  `static`  `String`  `dateSub(` `int`  `dateKind, ` `String`  `dateStr, ` `int`  `amount) {`

`    ` `Date`  `date = stringtoDate(dateStr, FORMAT_ONE);`

`    ` `Calendar calendar = Calendar.getInstance();`

`    ` `calendar.setTime(date);`

`    ` `calendar.add(dateKind, amount);`

`    ` `return`  `dateToString(calendar.getTime(), FORMAT_ONE);`

`  ` `}`

`          `

`  ` `/**`

`   ` `* 两个日期相减`

`   ` `* @return 相减得到的秒数`

`   ` `*/`

`  ` `public`  `static`  `long timeSub(` `String`  `firstTime, ` `String`  `secTime) {`

`    ` `long first = stringtoDate(firstTime, FORMAT_ONE).getTime();`

`    ` `long second = stringtoDate(secTime, FORMAT_ONE).getTime();`

`    ` `return`  `(second - first) / ` `1000` `;`

`  ` `}`

`          `

`  ` `/**`

`   ` `* 获得某月的天数`

`   ` `*/`

`  ` `public`  `static`  `int`  `getDaysOfMonth(` `String`  `year, ` `String`  `month) {`

`    ` `int`  `days = ` `0` `;`

`    ` `if`  `(month.equals(` `"1"` `) || month.equals(` `"3"` `) || month.equals(` `"5"` `)`

`        ` `|| month.equals(` `"7"` `) || month.equals(` `"8"` `) || month.equals(` `"10"` `)`

`        ` `|| month.equals(` `"12"` `)) {`

`      ` `days = ` `31` `;`

`    ` `} ` `else`  `if`  `(month.equals(` `"4"` `) || month.equals(` `"6"` `) || month.equals(` `"9"` `)`

`        ` `|| month.equals(` `"11"` `)) {`

`      ` `days = ` `30` `;`

`    ` `} ` `else`  `{`

`      ` `if`  `((Integer.` `parseInt` `(year) % ` `4`  `== ` `0`  `&& Integer.` `parseInt` `(year) % ` `100`  `!=` `0` `)`

`          ` `|| Integer.` `parseInt` `(year) % ` `400`  `== ` `0` `) {`

`        ` `days = ` `29` `;`

`      ` `} ` `else`  `{`

`        ` `days = ` `28` `;`

`      ` `}`

`    ` `}`

`          `

`    ` `return`  `days;`

`  ` `}`

`          `

`  ` `/**`

`   ` `* 获取某年某月的天数`

`   ` `*/`

`  ` `public`  `static`  `int`  `getDaysOfMonth(` `int`  `year, ` `int`  `month) {`

`    ` `Calendar calendar = Calendar.getInstance();`

`    ` `calendar.` `set` `(year, month - ` `1` `, ` `1` `);`

`    ` `return`  `calendar.getActualMaximum(Calendar.DAY_OF_MONTH);`

`  ` `}`

`          `

`  ` `/**`

`   ` `* 获得当前日期`

`   ` `*/`

`  ` `public`  `static`  `int`  `getToday() {`

`    ` `Calendar calendar = Calendar.getInstance();`

`    ` `return`  `calendar.` `get` `(Calendar.DATE);`

`  ` `}`

`          `

`  ` `/**`

`   ` `* 获得当前月份`

`   ` `*/`

`  ` `public`  `static`  `int`  `getToMonth() {`

`    ` `Calendar calendar = Calendar.getInstance();`

`    ` `return`  `calendar.` `get` `(Calendar.MONTH) + ` `1` `;`

`  ` `}`

`          `

`  ` `/**`

`   ` `* 获得当前年份`

`   ` `*/`

`  ` `public`  `static`  `int`  `getToYear() {`

`    ` `Calendar calendar = Calendar.getInstance();`

`    ` `return`  `calendar.` `get` `(Calendar.YEAR);`

`  ` `}`

`          `

`  ` `/**`

`   ` `* 返回日期的天`

`   ` `*/`

`  ` `public`  `static`  `int`  `getDay(` `Date`  `date) {`

`    ` `Calendar calendar = Calendar.getInstance();`

`    ` `calendar.setTime(date);`

`    ` `return`  `calendar.` `get` `(Calendar.DATE);`

`  ` `}`

`          `

`  ` `/**`

`   ` `* 返回日期的年`

`   ` `*/`

`  ` `public`  `static`  `int`  `getYear(` `Date`  `date) {`

`    ` `Calendar calendar = Calendar.getInstance();`

`    ` `calendar.setTime(date);`

`    ` `return`  `calendar.` `get` `(Calendar.YEAR);`

`  ` `}`

`          `

`  ` `/**`

`   ` `* 返回日期的月份，1-12`

`   ` `*/`

`  ` `public`  `static`  `int`  `getMonth(` `Date`  `date) {`

`    ` `Calendar calendar = Calendar.getInstance();`

`    ` `calendar.setTime(date);`

`    ` `return`  `calendar.` `get` `(Calendar.MONTH) + ` `1` `;`

`  ` `}`

`          `

`  ` `/**`

`   ` `* 计算两个日期相差的天数，如果date2 > date1 返回正数，否则返回负数`

`   ` `*/`

`  ` `public`  `static`  `long dayDiff(` `Date`  `date1, ` `Date`  `date2) {`

`    ` `return`  `(date2.getTime() - date1.getTime()) / ` `86400000` `;`

`  ` `}`

`          `

`  ` `/**`

`   ` `* 比较两个日期的年差`

`   ` `*/`

`  ` `public`  `static`  `int`  `yearDiff(` `String`  `before, ` `String`  `after) {`

`    ` `Date`  `beforeDay = stringtoDate(before, LONG_DATE_FORMAT);`

`    ` `Date`  `afterDay = stringtoDate(after, LONG_DATE_FORMAT);`

`    ` `return`  `getYear(afterDay) - getYear(beforeDay);`

`  ` `}`

`          `

`  ` `/**`

`   ` `* 比较指定日期与当前日期的差`

`   ` `*/`

`  ` `public`  `static`  `int`  `yearDiffCurr(` `String`  `after) {`

`    ` `Date`  `beforeDay = ` `new`  `Date` `();`

`    ` `Date`  `afterDay = stringtoDate(after, LONG_DATE_FORMAT);`

`    ` `return`  `getYear(beforeDay) - getYear(afterDay);`

`  ` `}`

`            `

`  ` `/**`

`   ` `* 比较指定日期与当前日期的差`

`   ` `*/`

`  ` `public`  `static`  `long dayDiffCurr(` `String`  `before) {`

`    ` `Date`  `currDate = DateUtil.stringtoDate(currDay(), LONG_DATE_FORMAT);`

`    ` `Date`  `beforeDate = stringtoDate(before, LONG_DATE_FORMAT);`

`    ` `return`  `(currDate.getTime() - beforeDate.getTime()) / ` `86400000` `;`

`          `

`  ` `}`

`          `

`  ` `/**`

`   ` `* 获取每月的第一周`

`   ` `*/`

`  ` `public`  `static`  `int`  `getFirstWeekdayOfMonth(` `int`  `year, ` `int`  `month) {`

`    ` `Calendar c = Calendar.getInstance();`

`    ` `c.setFirstDayOfWeek(Calendar.SATURDAY); ` `// 星期天为第一天`

`    ` `c.` `set` `(year, month - ` `1` `, ` `1` `);`

`    ` `return`  `c.` `get` `(Calendar.DAY_OF_WEEK);`

`  ` `}`

`  ` `/**`

`   ` `* 获取每月的最后一周`

`   ` `*/`

`  ` `public`  `static`  `int`  `getLastWeekdayOfMonth(` `int`  `year, ` `int`  `month) {`

`    ` `Calendar c = Calendar.getInstance();`

`    ` `c.setFirstDayOfWeek(Calendar.SATURDAY); ` `// 星期天为第一天`

`    ` `c.` `set` `(year, month - ` `1` `, getDaysOfMonth(year, month));`

`    ` `return`  `c.` `get` `(Calendar.DAY_OF_WEEK);`

`  ` `}`

`          `

`  ` `/**`

`   ` `* 获得当前日期字符串，格式"yyyy_MM_dd_HH_mm_ss"`

`   ` `*`

`   ` `* @return`

`   ` `*/`

`  ` `public`  `static`  `String`  `getCurrent() {`

`    ` `Calendar cal = Calendar.getInstance();`

`    ` `cal.setTime(` `new`  `Date` `());`

`    ` `int`  `year = cal.` `get` `(Calendar.YEAR);`

`    ` `int`  `month = cal.` `get` `(Calendar.MONTH) + ` `1` `;`

`    ` `int`  `day = cal.` `get` `(Calendar.DAY_OF_MONTH);`

`    ` `int`  `hour = cal.` `get` `(Calendar.HOUR_OF_DAY);`

`    ` `int`  `minute = cal.` `get` `(Calendar.MINUTE);`

`    ` `int`  `second = cal.` `get` `(Calendar.SECOND);`

`    ` `StringBuffer sb = ` `new`  `StringBuffer();`

`    ` `sb.append(year).append(` `"_"` `).append(StringUtil.addzero(month, ` `2` `))`

`        ` `.append(` `"_"` `).append(StringUtil.addzero(day, ` `2` `)).append(` `"_"` `)`

`        ` `.append(StringUtil.addzero(hour, ` `2` `)).append(` `"_"` `).append(`

`            ` `StringUtil.addzero(minute, ` `2` `)).append(` `"_"` `).append(`

`            ` `StringUtil.addzero(second, ` `2` `));`

`    ` `return`  `sb.toString();`

`  ` `}`

`          `

`  ` `/**`

`   ` `* 获得当前日期字符串，格式"yyyy-MM-dd HH:mm:ss"`

`   ` `*`

`   ` `* @return`

`   ` `*/`

`  ` `public`  `static`  `String`  `getNow() {`

`    ` `Calendar today = Calendar.getInstance();`

`    ` `return`  `dateToString(today.getTime(), FORMAT_ONE);`

`  ` `}`

`          `

`           `

`          `

`  ` `/**`

`   ` `* 判断日期是否有效,包括闰年的情况`

`   ` `*`

`   ` `* @param date`

`   ` `*     YYYY-mm-dd`

`   ` `* @return`

`   ` `*/`

`  ` `public`  `static`  `boolean isDate(` `String`  `date) {`

`    ` `StringBuffer reg = ` `new`  `StringBuffer(`

`        ` `"^((\\d{2}(([02468][048])|([13579][26]))-?((((0?"` `);`

`    ` `reg.append(` `"[13578])|(1[02]))-?((0?[1-9])|([1-2][0-9])|(3[01])))"` `);`

`    ` `reg.append(` `"|(((0?[469])|(11))-?((0?[1-9])|([1-2][0-9])|(30)))|"` `);`

`    ` `reg.append(` `"(0?2-?((0?[1-9])|([1-2][0-9])))))|(\\d{2}(([02468][12"` `);`

`    ` `reg.append(` `"35679])|([13579][01345789]))-?((((0?[13578])|(1[02]))"` `);`

`    ` `reg.append(` `"-?((0?[1-9])|([1-2][0-9])|(3[01])))|(((0?[469])|(11))"` `);`

`    ` `reg.append(` `"-?((0?[1-9])|([1-2][0-9])|(30)))|(0?2-?((0?["` `);`

`    ` `reg.append(` `"1-9])|(1[0-9])|(2[0-8]))))))"` `);`

`    ` `Pattern p = Pattern.compile(reg.toString());`

`    ` `return`  `p.matcher(date).matches();`

`  ` `}`

Date工具类

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