java时间处理工具类--DateUtils

package com.hexiang.utils;

/**
* @(#)DateUtil.java
*
*
* @author kidd
* @version 1.00 2007/8/8
*/
import java.util.*;
import java.text.*;
import java.sql.Timestamp;

public class DateUtils {

/**
* 时间范围：年
*/
public static final int YEAR = 1;

/**
* 时间范围：季度
*/
public static final int QUARTER = 2;

/**
* 时间范围：月
*/
public static final int MONTH = 3;

/**
* 时间范围：旬
*/
public static final int TENDAYS = 4;

/**
* 时间范围：周
*/
public static final int WEEK = 5;

/**
* 时间范围：日
*/
public static final int DAY = 6;

/* 基准时间 */
private Date fiducialDate = null;

private Calendar cal = null;

private DateUtils(Date fiducialDate) {
if (fiducialDate != null) {
this.fiducialDate = fiducialDate;
} else {
this.fiducialDate = new Date(System.currentTimeMillis());
}

this.cal = Calendar.getInstance();
this.cal.setTime(this.fiducialDate);
this.cal.set(Calendar.HOUR_OF_DAY, 0);
this.cal.set(Calendar.MINUTE, 0);
this.cal.set(Calendar.SECOND, 0);
this.cal.set(Calendar.MILLISECOND, 0);

this.fiducialDate = this.cal.getTime();
}

/**
* 获取DateHelper实例
*
* @param fiducialDate
*            基准时间
* @return Date
*/
public static DateUtils getInstance(Date fiducialDate) {
return new DateUtils(fiducialDate);
}

/**
* 获取DateHelper实例, 使用当前时间作为基准时间
*
* @return Date
*/
public static DateUtils getInstance() {
return new DateUtils(null);
}

/**
* 获取年的第一天
*
* @param offset
*            偏移量
* @return Date
*/
public Date getFirstDayOfYear(int offset) {
cal.setTime(this.fiducialDate);
cal.set(Calendar.YEAR, cal.get(Calendar.YEAR) + offset);
cal.set(Calendar.MONTH, Calendar.JANUARY);
cal.set(Calendar.DAY_OF_MONTH, 1);
return cal.getTime();
}

/**
* 获取年的最后一天
*
* @param offset
*            偏移量
* @return Date
*/
public Date getLastDayOfYear(int offset) {
cal.setTime(this.fiducialDate);
cal.set(Calendar.YEAR, cal.get(Calendar.YEAR) + offset);
cal.set(Calendar.MONTH, Calendar.DECEMBER);
cal.set(Calendar.DAY_OF_MONTH, 31);
return cal.getTime();
}

/**
* 获取季度的第一天
*
* @param offset
*            偏移量
* @return Date
*/
public Date getFirstDayOfQuarter(int offset) {
cal.setTime(this.fiducialDate);
cal.add(Calendar.MONTH, offset * 3);
int mon = cal.get(Calendar.MONTH);
if (mon >= Calendar.JANUARY && mon <= Calendar.MARCH) {
cal.set(Calendar.MONTH, Calendar.JANUARY);
cal.set(Calendar.DAY_OF_MONTH, 1);
}
if (mon >= Calendar.APRIL && mon <= Calendar.JUNE) {
cal.set(Calendar.MONTH, Calendar.APRIL);
cal.set(Calendar.DAY_OF_MONTH, 1);
}
if (mon >= Calendar.JULY && mon <= Calendar.SEPTEMBER) {
cal.set(Calendar.MONTH, Calendar.JULY);
cal.set(Calendar.DAY_OF_MONTH, 1);
}
if (mon >= Calendar.OCTOBER && mon <= Calendar.DECEMBER) {
cal.set(Calendar.MONTH, Calendar.OCTOBER);
cal.set(Calendar.DAY_OF_MONTH, 1);
}
return cal.getTime();
}

public Date getYesterday() {
long time = this.fiducialDate.getTime() - 60 * 60 * 24 * 1000;
return new Date(time);
}

public Date getTomorrow(){
long time = this.fiducialDate.getTime() + 60 * 60 * 24 * 1000;
return new Date(time);
}

/**
* 获取季度的最后一天
*
* @param offset
*            偏移量
* @return Date
*/
public Date getLastDayOfQuarter(int offset) {
cal.setTime(this.fiducialDate);
cal.add(Calendar.MONTH, offset * 3);

int mon = cal.get(Calendar.MONTH);
if (mon >= Calendar.JANUARY && mon <= Calendar.MARCH) {
cal.set(Calendar.MONTH, Calendar.MARCH);
cal.set(Calendar.DAY_OF_MONTH, 31);
}
if (mon >= Calendar.APRIL && mon <= Calendar.JUNE) {
cal.set(Calendar.MONTH, Calendar.JUNE);
cal.set(Calendar.DAY_OF_MONTH, 30);
}
if (mon >= Calendar.JULY && mon <= Calendar.SEPTEMBER) {
cal.set(Calendar.MONTH, Calendar.SEPTEMBER);
cal.set(Calendar.DAY_OF_MONTH, 30);
}
if (mon >= Calendar.OCTOBER && mon <= Calendar.DECEMBER) {
cal.set(Calendar.MONTH, Calendar.DECEMBER);
cal.set(Calendar.DAY_OF_MONTH, 31);
}
return cal.getTime();
}

/**
* 获取月的最后一天
*
* @param offset
*            偏移量
* @return Date
*/
public Date getFirstDayOfMonth(int offset) {
cal.setTime(this.fiducialDate);
cal.add(Calendar.MONTH, offset);
cal.set(Calendar.DAY_OF_MONTH, 1);
return cal.getTime();
}

/**
* 获取月的最后一天
*
* @param offset
*            偏移量
* @return Date
*/
public Date getLastDayOfMonth(int offset) {
cal.setTime(this.fiducialDate);
cal.add(Calendar.MONTH, offset + 1);
cal.set(Calendar.DAY_OF_MONTH, 1);
cal.add(Calendar.DAY_OF_MONTH, -1);
return cal.getTime();
}

/**
* 获取旬的第一天
*
* @param offset
*            偏移量
* @return Date
*/
public Date getFirstDayOfTendays(int offset) {
cal.setTime(this.fiducialDate);
int day = cal.get(Calendar.DAY_OF_MONTH);
if (day >= 21) {
day = 21;
} else if (day >= 11) {
day = 11;
} else {
day = 1;
}

if (offset > 0) {
day = day + 10 * offset;
int monOffset = day / 30;
day = day % 30;
cal.add(Calendar.MONTH, monOffset);
cal.set(Calendar.DAY_OF_MONTH, day);
} else {
int monOffset = 10 * offset / 30;
int dayOffset = 10 * offset % 30;
if ((day + dayOffset) > 0) {
day = day + dayOffset;
} else {
monOffset = monOffset - 1;
day = day - dayOffset - 10;
}
cal.add(Calendar.MONTH, monOffset);
cal.set(Calendar.DAY_OF_MONTH, day);
}
return cal.getTime();
}

/**
* 获取旬的最后一天
*
* @param offset
*            偏移量
* @return Date
*/
public Date getLastDayOfTendays(int offset) {
Date date = getFirstDayOfTendays(offset + 1);
cal.setTime(date);
cal.add(Calendar.DAY_OF_MONTH, -1);
return cal.getTime();
}

/**
* 获取周的第一天(MONDAY)
*
* @param offset
*            偏移量
* @return Date
*/
public Date getFirstDayOfWeek(int offset) {
cal.setTime(this.fiducialDate);
cal.add(Calendar.DAY_OF_MONTH, offset * 7);
cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
return cal.getTime();
}

/**
* 获取周的最后一天(SUNDAY)
*
* @param offset
*            偏移量
* @return Date
*/
public Date getLastDayOfWeek(int offset) {
cal.setTime(this.fiducialDate);
cal.add(Calendar.DAY_OF_MONTH, offset * 7);
cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
cal.add(Calendar.DAY_OF_MONTH, 6);
return cal.getTime();
}

/**
* 获取指定时间范围的第一天
*
* @param dateRangeType
*            时间范围类型
* @param offset
*            偏移量
* @return Date
*/
public Date getFirstDate(int dateRangeType, int offset) {
return null;
}

/**
* 获取指定时间范围的最后一天
*
* @param dateRangeType
*            时间范围类型
* @param offset
*            偏移量
* @return Date
*/
public Date getLastDate(int dateRangeType, int offset) {
return null;
}

/**
* 根据日历的规则，为基准时间添加指定日历字段的时间量
*
* @param field
*            日历字段, 使用Calendar类定义的日历字段常量
* @param offset
*            偏移量
* @return Date
*/
public Date add(int field, int offset) {
cal.setTime(this.fiducialDate);
cal.add(field, offset);
return cal.getTime();
}

/**
* 根据日历的规则，为基准时间添加指定日历字段的单个时间单元
*
* @param field
*            日历字段, 使用Calendar类定义的日历字段常量
* @param up
*            指定日历字段的值的滚动方向。true:向上滚动 / false:向下滚动
* @return Date
*/
public Date roll(int field, boolean up) {
cal.setTime(this.fiducialDate);
cal.roll(field, up);
return cal.getTime();
}

/**
* 把字符串转换为日期
*
* @param dateStr
*            日期字符串
* @param format
*            日期格式
* @return Date
*/
public static Date strToDate(String dateStr, String format) {
Date date = null;

if (dateStr != null && (!dateStr.equals(""))) {
DateFormat df = new SimpleDateFormat(format);
try {
date = df.parse(dateStr);
} catch (ParseException e) {
e.printStackTrace();
}
}
return date;
}

/**
* 把字符串转换为日期，日期的格式为yyyy-MM-dd HH:ss
*
* @param dateStr
*            日期字符串
* @return Date
*/
public static Date strToDate(String dateStr) {
Date date = null;

if (dateStr != null && (!dateStr.equals(""))) {
if (dateStr.matches("\\d{4}-\\d{1,2}-\\d{1,2}")) {
dateStr = dateStr + " 00:00";
} else if (dateStr.matches("\\d{4}-\\d{1,2}-\\d{1,2} \\d{1,2}")) {
dateStr = dateStr + ":00";
} else {
System.out.println(dateStr + " 格式不正确");
return null;
}
DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:ss");
try {
date = df.parse(dateStr);
} catch (ParseException e) {
e.printStackTrace();
}
}
return date;
}

/**
* 把日期转换为字符串
*
* @param date
*            日期实例
* @param format
*            日期格式
* @return Date
*/
public static String dateToStr(Date date, String format) {
return (date == null) ? "" : new SimpleDateFormat(format).format(date);
}

public static String dateToStr(Date date) {
return (date == null) ? ""
: new SimpleDateFormat("yyyy-MM-dd hh:mm:ss").format(date);
}

/**
* 取得当前日期 年-月-日
*
* @return Date
*/
public static String getCurrentDate() {
DateFormat f = new SimpleDateFormat("yyyy-MM-dd");
return f.format(Calendar.getInstance().getTime());
}

public static void main(String[] args) {
DateUtils dateHelper = DateUtils.getInstance();

/* Year */
for (int i = -5; i <= 5; i++) {
System.out.println("FirstDayOfYear(" + i + ") = "
+ dateHelper.getFirstDayOfYear(i));
System.out.println("LastDayOfYear(" + i + ") = "
+ dateHelper.getLastDayOfYear(i));
}

/* Quarter */
for (int i = -5; i <= 5; i++) {
System.out.println("FirstDayOfQuarter(" + i + ") = "
+ dateHelper.getFirstDayOfQuarter(i));
System.out.println("LastDayOfQuarter(" + i + ") = "
+ dateHelper.getLastDayOfQuarter(i));
}

/* Month */
for (int i = -5; i <= 5; i++) {
System.out.println("FirstDayOfMonth(" + i + ") = "
+ dateHelper.getFirstDayOfMonth(i));
System.out.println("LastDayOfMonth(" + i + ") = "
+ dateHelper.getLastDayOfMonth(i));
}

/* Week */
for (int i = -5; i <= 5; i++) {
System.out.println("FirstDayOfWeek(" + i + ") = "
+ dateHelper.getFirstDayOfWeek(i));
System.out.println("LastDayOfWeek(" + i + ") = "
+ dateHelper.getLastDayOfWeek(i));
}

/* Tendays */
for (int i = -5; i <= 5; i++) {
System.out.println("FirstDayOfTendays(" + i + ") = "
+ dateHelper.getFirstDayOfTendays(i));
System.out.println("LastDayOfTendays(" + i + ") = "
+ dateHelper.getLastDayOfTendays(i));
}
}

/**
* 取当前日期的字符串形式,"XXXX年XX月XX日"
*
* @return java.lang.String
*/
public static String getPrintDate() {
String printDate = "";
Calendar calendar = Calendar.getInstance();
calendar.setTime(new Date());
printDate += calendar.get(Calendar.YEAR) + "年";
printDate += (calendar.get(Calendar.MONTH) + 1) + "月";
printDate += calendar.get(Calendar.DATE) + "日";
return printDate;
}

/**
* 将指定的日期字符串转化为日期对象
*
* @param dateStr
*            日期字符串
* @return java.util.Date
*/
public static Date getDate(String dateStr, String format) {
if (dateStr == null) {
return new Date();
}
if (format == null) {
format = "yyyy-MM-dd";
}
SimpleDateFormat sdf = new SimpleDateFormat(format);
try {
Date date = sdf.parse(dateStr);
return date;
} catch (Exception e) {
return null;
}
}

/**
* 从指定Timestamp中得到相应的日期的字符串形式 日期"XXXX-XX-XX"
*
* @param dateTime
* @return 、String
*/
public static String getDateFromDateTime(Timestamp dateTime) {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
return sdf.format(dateTime).toString();
}

/**
* 得到当前时间 return java.sql.Timestamp
*
* @return Timestamp
*/
public static Timestamp getNowTimestamp() {
long curTime = System.currentTimeMillis();
return new Timestamp(curTime);
}
}