Java日期处理工具类DateUtils详解

Java日期处理工具类DateUtils详解

本goZgXGNq文实例为大家分享了java日期处理工具类DateUtils的具体代码，供大家参考，具体内容如下

import java.sql.Timestamp;

import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.Calendar;

import java.util.Date;

/**

* <日期时间处理工具类>

*/

public class DateUtils {

/**

* Date format pattern this is often used.

*/

public static final String PATTERN_YMD = "yyyy-MM-dd";

/**

* Date format pattern this is often used.

*/

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

/**

* Formats the given date according to the YMD pattern.

*

* @param date The date to format.

* @return An YMD formatted date string.

*

* @see #PATTERN_YMD

*/

public static String formatDate(Date date) {

return formatDate(date, PATTERN_YMD);

}

/**

* Formats the given date according to the specified pattern. The pattern

* must conform to that used by the {@link SimpleDateFormat simple date

* format} class.

*

* @param date The date to format.

* @param pattern The pattern to use for formatting the date.

* @return A formatted date string.

*

* @throws IllegalArgumentException If the given date pattern is invalid.

*

* @see SimpleDateFormat

*/

public static String formatDate(Date date, String pattern) {

if (date == null)

throw new IllegalArgumentException("date is null");

if (pattern == null)

throw new IllegalArgumentException("pattern is null");

SimpleDateFormat formatter = new SimpleDateFormat(pattern);

return formatter.format(date);

}

/**

* Parses a date value. The format used for parsing the date value are retrieved from

* the default PATTERN_YMD.

*

* @param dateValue the date value to parse

*

* @return the parsed date

*

* @throws IllegalArgumentException If the given dateValue is invalid.

*/

public static Date parseDate(String dateValue) {

return parseDate(dateValue, null);

}

/**

* Parses the date value using the given date format.

*

* @param dateValue the date value to parse

* @param dateFormat the date format to use

*

* @return the parsed date. if parse is failed , return null

*

* @throws IllegalArgumentException If the given dateValue is invalid.

*/

public static Date parseDate(String dateValue, String dateFormat) {

if (dateValue == null) {

throw new IllegalArgumentException("dateValue is null");

}

if (dateFormat == null) {

dateFormat = PATTERN_YMD;

}

SimpleDateFormat df = new SimpleDateFormat(dateFormat);

Date result = null;

try {

result = df.parse(dateValue);

}

catch (ParseException pe) {

pe.printStackTrace();// 日期型字符串格式错误

}

return result;

}

/**

* Adds a number of years to a date returning a new object.

* The original date object is ugoZgXGNqnchanged.

*

* @param date the date, not null

* @param amount the amount to add, may be negative

* @return the new date object with the amount added

* @throws IllegalArgumentException if the date is null

*/

public static Date addYears(Date date, int amount) {

return add(date, Calendar.YEAR, amount);

}

/**

* Adds a number of years to a timestamp returning a new object.

* The original timestamp object is unchanged.

*

* @param timestamp the timestamp, not null

* @param amount the amount to add, may be negative

* @return the new timestamp object with the amount added

* @throws IllegalArgumentException if the timestamp is null

*/

public static Timestamp addYears(Timestamp timestamp, int amount) {

return add(goZgXGNqtimestamp, Calendar.YEAR, amount);

}

//-----------------------------------------------------------------------

/**

* Adds a number of months to a date returning a new object.

* The original date object is unchanged.

*

* @param date the date, not null

* @param amount the amount to add, may be negative

* @return the new date object with the amount added

* @throws IllegalArgumentException if the date is nulhttp://l

*/

public static Date addMonths(Date date, int amount) {

return add(date, Calendar.MONTH, amount);

}

/**

* Adds a number of months to a timestamp returning a new object.

* The original timestamp object is unchanged.

*

* @param timestamp the timestamp, not null

* @param amount the amount to add, may be negative

* @return the new timestamp object with the amount added

* @throws IllegalArgumentException if the timestamp is null

*/

public static Timestamp addMonths(Timestamp timestamp, int amount) {

return add(timestamp, Calendar.MONTH, amount);

}

//-----------------------------------------------------------------------

/**

* Adds a number of days to a date returning a new object.

* The original date object is unchanged.

*

* @param date the date, not null

* @param amount the amount to add, may be negative

* @return the new date object with the amount added

* @throws IllegalArgumentException if the date is null

*/

public static Date addDays(Date date, int amount) {

return add(date, Calendar.DATE, amount);

}

/**

* Adds a number of days to a timestamp returning a new object.

* The original timestamp object is unchanged.

*

* @param timestamp the timestamp, not null

* @param amount the amount to add, may be negative

* @return the new timestamp object with the amount added

* @throws IllegalArgumentException if the timestamp is null

*/

public static Timestamp addDays(Timestamp timestamp, int amount) {

return add(timestamp, Calendar.DATE, amount);

}

//-----------------------------------------------------------------------

/**

* Adds a number of minutes to a timestamp returning a new object.

* The original timestamp object is unchanged.

*

* @param timestamp the timestamp, not null

* @param amount the amount to add, may be negative

* @return the new timestamp object with the amount added

* @throws IllegalArgumentException if the timestamp is null

*/

public static Timestamp addMinutes(Timestamp timestamp, int amount) {

return add(timestamp, Calendar.MINUTE, amount);

}

/**

* Adds a number of days to current time returning a new object.

*

* @param amount the amount to add, may be negative

* @return the new timestamp object with the amount added

*/

public static Timestamp addDays(int amount) {

Calendar c = Calendar.getInstance();

c.add(Calendar.DATE, amount);

return new Timestamp(c.getTimeInMillis());

}

//-----------------------------------------------------------------------

/**

* Adds to a date returning a new object.

* The original date object is unchanged.

*

* @param date the date, not null

* @param calendarField the calendar field to add to

* @param amount the amount to add, may be negative

* @return the new date object with the amount added

* @throws IllegalArgumentException if the date is null

*/

private static Date add(Date date, int calendarField, int amount) {

if (date == null) {

throw new IllegalArgumentException("The date must not be null");

}

Calendar c = Calendar.getInstance();

c.setTime(date);

c.add(calendarField, amount);

return c.getTime();

}

/**

* Adds to a timestamp returning a new object.

* The original timestamp object is unchanged.

*

* @param timestamp the timestamp, not null

* @param calendarField the calendar field to add to

* @param amount the amount to add, may be negative

* @return the new timestamp object with the amount added

* @throws IllegalArgumentException if the timestamp is null

*/

private static Timestamp add(Timestamp timestamp, int calendarField, int amount) {

if (timestamp == null) {

throw new IllegalArgumentException("The timestamp must not be null");

}

Calendar c = Calendar.getInstance();

c.setTime(timestamp);

c.add(calendarField, amount);

return new Timestamp(c.getTimeInMillis());

}

/**

* <生成最小的当天日期值>

* @return 最小的当天日期值

*/

public static Timestamp now() {

Calendar c = Calendar.getInstance();

c.set(Calendar.HOUR_OF_DAY, 0);

c.set(Calendar.MINUTE, 0);

c.set(Calendar.SECOND, 0);

c.set(Calendar.MILLISECOND, 0);

return new Timestamp(c.getTimeInMillis());

}

/** This class should not be instantiated. */

private DateUtils() {

}

}

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