java日期处理简单封装
今天没什么事情做，温习一下基本知识，在网上看到和日期处理的相关框架，什么joda，date4j等，都宣称超级强大简单易用。下下来试了下，确实都挺不错。不过自己不是经常涉及到日期操作，且涉及到的也不复杂。且不说这些库的功能强不强大，单说为了处理个时间就引入几十个类，实在有点浪费了。再说JDK提供的Calendar和SimpleDateFormat组合使用功能也还是非常强大啊。如果觉得同时使用这两个类稍显麻烦，可以稍微封装一下，即可满足大部分需求，就一个类，自己需要用到什么功能的时候，添加进去就行了。
package luojing.date;
import java.io.Serializable;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;
/**
* 日期时间处理封装
*
* @author luojing
*/
public class DateTime implements Comparable<DateTime>, Serializable {
private static final long serialVersionUID = 4715414577633839197L;
private Calendar calendar = Calendar.getInstance();
private SimpleDateFormat sdf = new SimpleDateFormat();
private final String DEFAULT_DATETIME_PATTERN = "yyyy-MM-dd HH:mm:ss";
private final String DEFAULT_DATE_PATTERN = "yyyy-MM-dd";
private final String DEFAULT_TIME_PATTERN = "HH:mm:ss";
public DateTime() {
}
public DateTime(String dateStr) {
try {
parse(dateStr);
} catch (Exception e) {
e.printStackTrace();
}
}
public DateTime(String dateStr, TimeZone timeZone) {
this(dateStr);
calendar.setTimeZone(timeZone);
}
public DateTime(String dateStr, String pattern) {
try {
parse(dateStr, pattern);
} catch (Exception e) {
e.printStackTrace();
}
}
public DateTime(String dateStr, String pattern, TimeZone timeZone) {
this(dateStr, pattern);
calendar.setTimeZone(timeZone);
}
public DateTime(int year, int month, int day, int hour, int minute, int second) {
calendar.set(year, month, day, hour, minute, second);
}
public DateTime(int year, int month, int day, int hour, int minute, int second, TimeZone timeZone) {
this(year, month, day, hour, minute, second);
calendar.setTimeZone(timeZone);
}
public DateTime(long milliSeconds) {
calendar.setTimeInMillis(milliSeconds);
}
public Calendar getCalendar() {
return calendar;
}
public void setCalendar(Calendar calendar) {
this.calendar = calendar;
}
public Date getDate() {
return calendar.getTime();
}
public void setDate(Date date) {
calendar.setTime(date);
}
public int getYear() {
return calendar.get(Calendar.YEAR);
}
public void setYear(int year) {
calendar.set(Calendar.YEAR, year);
}
public int getMonth() {
return calendar.get(Calendar.MONTH);
}
public void setMonth(int month) {
calendar.set(Calendar.MONTH, month);
}
public int getDay() {
return calendar.get(Calendar.DAY_OF_MONTH);
}
public void setDay(int dayOfMonth) {
calendar.set(Calendar.DAY_OF_MONTH, dayOfMonth);
}
public int getHour() {
return calendar.get(Calendar.HOUR_OF_DAY);
}
public void setHour(int hour) {
calendar.set(Calendar.HOUR_OF_DAY, hour);
}
public int getMinute() {
return calendar.get(Calendar.MINUTE);
}
public void setMinute(int minute) {
calendar.set(Calendar.MINUTE, minute);
}
public int getSecond() {
return calendar.get(Calendar.SECOND);
}
public void setSecond(int second) {
calendar.set(Calendar.SECOND, second);
}
public long getTimeInMilliSeconds() {
return calendar.getTimeInMillis();
}
public void setTimeInMilliSeconds(long milliSeconds) {
calendar.setTimeInMillis(milliSeconds);
}
public TimeZone getTimeZone() {
return calendar.getTimeZone();
}
public void setTimeZone(TimeZone timeZone) {
calendar.setTimeZone(timeZone);
}
/**
* 使用默认格式解析日期字符串
*
* @param dateStr
* @throws Exception
*/
public void parse(String dateStr) throws Exception {
try {
parse(dateStr, DEFAULT_DATETIME_PATTERN);
} catch (Exception e) {
try {
parse(dateStr, DEFAULT_DATE_PATTERN);
} catch (Exception e1) {
try {
parse(dateStr, DEFAULT_TIME_PATTERN);
} catch (Exception e2) {
throw new Exception("the date string [" + dateStr + "] could not be parsed");
}
}
}
}
/**
* 使用给定模式解析日期字符串
*
* @param dateStr
* @param pattern
* @throws Exception
*/
public void parse(String dateStr, String pattern) throws Exception {
if (dateStr == null) {
throw new NullPointerException("date string could not be null");
}
if (pattern == null) {
throw new NullPointerException("the pattern string could not be null");
}
try {
sdf.applyPattern(pattern);
sdf.parse(dateStr);
} catch (ParseException e) {
throw new Exception("the date string [" + dateStr + "] could not be parsed with the pattern [" + pattern + "]");
}
calendar = sdf.getCalendar();
}
/**
* 格式化当前DateTime对象代表的时间
*
* @param pattern
* @return
*/
public String format(String pattern) {
sdf.applyPattern(pattern);
return sdf.format(calendar.getTime());
}
/**
* 获取默认格式日期字符串
*
* @return
*/
public String toDateTimeString() {
sdf.applyPattern(DEFAULT_DATETIME_PATTERN);
return sdf.format(calendar.getTime());
}
@Override
public int compareTo(DateTime otherDateTime) {
return calendar.compareTo(otherDateTime.getCalendar());
}
/**
* 是否闰年
*
* @return
*/
public boolean isLeapYear() {
int year = getYear();
boolean result = false;
if (year % 100 == 0) {
if (year % 400 == 0) {
result = true;
}
} else if (year % 4 == 0) {
result = true;
}
return result;
}
/**
* 获取星期
*
* @return
*/
public int getDayOfWeek() {
return calendar.get(Calendar.DAY_OF_WEEK);
}
/**
* 是否周末
*
* @return
*/
public boolean isWeekend() {
int dayOfWeek = getDayOfWeek();
return dayOfWeek == 1 || dayOfWeek == 7;
}
/**
* 当前DateTime对象月份天数
*
* @return
*/
public int getDayNumsInMonth() {
Calendar c = (Calendar) calendar.clone();
c.set(Calendar.DAY_OF_MONTH, 1);
c.roll(Calendar.DAY_OF_MONTH, -1);
return c.get(Calendar.DAY_OF_MONTH);
}
/**
* 两个日期之间间隔天数
*
* @param otherDateTime
* @return
*/
public int dayNumFrom(DateTime otherDateTime) {
long millis = Math.abs(getTimeInMilliSeconds() - otherDateTime.getTimeInMilliSeconds());
int days = (int) Math.floor(millis / 86400000);
return days;
}
public boolean lessThan(DateTime otherDateTime) {
return compareTo(otherDateTime) < 0;
}
public boolean greaterThan(DateTime otherDateTime) {
return compareTo(otherDateTime) > 0;
}
public boolean equal(DateTime otherDateTime) {
return compareTo(otherDateTime) == 0;
}
/**
* 当前时间基础上增加秒数(负数时为减)
*
* @param amount
*/
public void plusSecond(int amount) {
calendar.add(Calendar.SECOND, amount);
}
public void plusMinute(int amount) {
calendar.add(Calendar.MINUTE, amount);
}
public void plusHour(int amount) {
calendar.add(Calendar.HOUR, amount);
}
public void plusDays(int amount) {
calendar.add(Calendar.DAY_OF_MONTH, amount);
}
public void plusMonth(int amount) {
calendar.add(Calendar.MONTH, amount);
}
public void plusYear(int amount) {
calendar.add(Calendar.YEAR, amount);
}
public void plus(int year, int month, int day, int hour, int minute, int second) {
plusYear(year);
plusMonth(month);
plusDays(day);
plusHour(hour);
plusMinute(minute);
plusSecond(second);
}
}
测试：
package luojing.date;
import java.util.Date;
public class DateTimeTest {
public static void main(String[] args) throws Exception {
DateTime dateTime = new DateTime();
DateTime dateTime2 = new DateTime("2013-12-12");
System.out.println("默认格式输出：" + dateTime.toDateTimeString());
System.out.println("是否闰年:" + dateTime.isLeapYear());
System.out.println("自定义格式输出：" + dateTime.format("yyyy-MM-dd"));
System.out.println("输出到毫秒：" + dateTime.format("yyyy-MM-dd HH:mm:ss.SSS"));
System.out.println("某月天数：" + dateTime.getDayNumsInMonth());
System.out.println("星期：" + dateTime.getDayOfWeek());//1:星期日,7:星期六
System.out.println("是否周末：" + dateTime.isWeekend());
System.out.println("相距：" + dateTime.dayNumFrom(dateTime2) + "天");
dateTime.plusMonth(1);
System.out.println("增加一个月后的datetime: " + dateTime.toDateTimeString());
dateTime.plus(0, 0, 2, 4, 4, 5);
System.out.println("增加 XXX后的datetime: " + dateTime.toDateTimeString());
System.out.println("毫秒数：" + dateTime.getTimeInMilliSeconds());
//DateTime转换为Date
Date date = dateTime.getDate();
System.out.println( dateTime.getTimeInMilliSeconds() == date.getTime());
}
}
输出：
默认格式输出：2013-09-25 19:16:15
是否闰年:false
自定义格式输出：2013-09-25
输出到毫秒：2013-09-25 19:16:15.278
某月天数：30
星期：4
是否周末：false
相距：77天
增加一个月后的datetime: 2013-10-25 19:16:15
增加 XXX后的datetime: 2013-10-27 23:20:20
毫秒数：1382887220278
true