package com.hundsun.jresplus.common.util;
import java.sql.Timestamp;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Date Utility Class used to convert Strings to Dates and Timestamps
*
* @author <a href="mailto:matt@raibledesigns.com">Matt Raible</a> Modified by
* <a href="mailto:dan@getrolling.com">Dan Kibler </a> to correct time
* pattern. Minutes should be mm not MM (MM is month).
*/
public class DateUtil {
private static Logger log = LoggerFactory.getLogger(DateUtil.class);
private static final String TIME_PATTERN = "HH:mm";
/**
* Checkstyle rule: utility classes should not have public constructor
*/
public DateUtil() {
}
// Timestamp和String之间转换的函数：
public static String getTimestampToString(Timestamp obj) {
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");// 定义格式，不显示毫秒
String str = df.format(obj);
return str;
}
/*
* 自定义 转换模式将Timestamp 输出
*/
public static String getTimestampToString(String formatPattern,
Timestamp obj) {
SimpleDateFormat df = new SimpleDateFormat(formatPattern);
String str = df.format(obj);
return str;
}
// String转化为Timestamp:
public static Timestamp getStringToTimestamp(String str) {
Timestamp ts = Timestamp.valueOf(str);
return ts;
}
public static Date strToDate(String str, String pattern) {
Date dateTemp = null;
SimpleDateFormat formater2 = new SimpleDateFormat(pattern);
try {
dateTemp = formater2.parse(str);
} catch (Exception e) {
log.error("exception in convert string to date!");
}
return dateTemp;
}
/**
* Return default datePattern (yyyy-MM-dd)
*
* @return a string representing the date pattern on the UI
*/
public static String getDatePattern() {
return "yyyy-MM-dd";
}
public static String getDateTimePattern() {
return DateUtil.getDatePattern() + " HH:mm:ss.S";
}
/**
* This method attempts to convert an Oracle-formatted date in the form
* dd-MMM-yyyy to yyyy-MM-dd.
*
* @param aDate
* date from database as a string
* @return formatted string for the ui
*/
public static String getDate(Date aDate) {
SimpleDateFormat df;
String returnValue = "";
if (aDate != null) {
df = new SimpleDateFormat(getDatePattern());
returnValue = df.format(aDate);
}
return (returnValue);
}
/**
* This method generates a string representation of a date/time in the
* format you specify on input
*
* @param aMask
* the date pattern the string is in
* @param strDate
* a string representation of a date
* @return a converted Date object
* @see java.text.SimpleDateFormat
* @throws ParseException
* when String doesn't match the expected format
*/
public static Date convertStringToDate(String aMask, String strDate)
throws ParseException {
SimpleDateFormat df;
Date date;
df = new SimpleDateFormat(aMask);
if (log.isDebugEnabled()) {
log.debug("converting '" + strDate + "' to date with mask '"
+ aMask + "'");
}
try {
date = df.parse(strDate);
} catch (ParseException pe) {
// log.error("ParseException: " + pe);
throw new ParseException(pe.getMessage(), pe.getErrorOffset());
}
return (date);
}
/**
* This method returns the current date time in the format: yyyy-MM-dd HH:MM
* a
*
* @param theTime
* the current time
* @return the current date/time
*/
public static String getTimeNow(Date theTime) {
return getDateTime(TIME_PATTERN, theTime);
}
/**
* This method returns the current date in the format: yyyy-MM-dd
*
* @return the current date
* @throws ParseException
* when String doesn't match the expected format
*/
public static Calendar getToday() throws ParseException {
Date today = new Date();
SimpleDateFormat df = new SimpleDateFormat(getDatePattern());
// This seems like quite a hack (date -> string -> date),
// but it works ;-)
String todayAsString = df.format(today);
Calendar cal = new GregorianCalendar();
cal.setTime(convertStringToDate(todayAsString));
return cal;
}
public static Calendar getCurrentDay() throws ParseException {
Calendar cal = Calendar.getInstance();
return cal;
}
/**
* This method generates a string representation of a date's date/time in
* the format you specify on input
*
* @param aMask
* the date pattern the string is in
* @param aDate
* a date object
* @return a formatted string representation of the date
*
* @see java.text.SimpleDateFormat
*/
public static String getDateTime(String aMask, Date aDate) {
SimpleDateFormat df = null;
String returnValue = "";
if (aDate == null) {
log.error("aDate is null!");
} else {
df = new SimpleDateFormat(aMask);
returnValue = df.format(aDate);
}
return (returnValue);
}
/**
* This method generates a string representation of a date based on the
* System Property 'dateFormat' in the format you specify on input
*
* @param aDate
* A date to convert
* @return a string representation of the date
*/
public static String convertDateToString(Date aDate) {
return getDateTime(getDatePattern(), aDate);
}
/**
* This method converts a String to a date using the datePattern
*
* @param strDate
* the date to convert (in format yyyy-MM-dd)
* @return a date object
* @throws ParseException
* when String doesn't match the expected format
*/
public static Date convertStringToDate(String strDate)
throws ParseException {
Date aDate = null;
try {
if (log.isDebugEnabled()) {
log.debug("converting date with pattern: " + getDatePattern());
}
aDate = convertStringToDate(getDatePattern(), strDate);
} catch (ParseException pe) {
log.error("Could not convert '" + strDate
+ "' to a date, throwing exception");
log.error(pe.getMessage());
throw new ParseException(pe.getMessage(), pe.getErrorOffset());
}
return aDate;
}
/**
*
* @param aDate
* @return
*/
public static String convertDateToString(String pattern, Date aDate) {
return getDateTime(pattern, aDate);
}
/**
* 取得从startDate开始的前(正)/后(负)day天
*
* @param startDate
* @param day
* @return
*/
public static Date getRelativeDate(Date startDate, int day) {
Calendar calendar = Calendar.getInstance();
try {
calendar.setTime(startDate);
calendar.add(Calendar.DAY_OF_MONTH, day);
return calendar.getTime();
} catch (Exception e) {
log.error(e.getMessage());
return startDate;
}
}
/**
* 根据日期获取星期几
*
* @param date
* java.util.Date对象,不能为null
* @return
*/
public static int getDay(Date date) {
Calendar cal = Calendar.getInstance();
cal.setTime(date);
return cal.get(Calendar.DAY_OF_WEEK) - 1;
}
/**
* 统计两个时间差，返回的是天数(即24小时算一天，少于24小时就为0，用这个的时候最好把小时、分钟等去掉)
*
* @param begin
* 开始时间
* @param end
* @return
*/
public static int countDays(String beginStr, String endStr, String Foramt) {
Date end = strToDate(endStr, Foramt);
Date begin = strToDate(beginStr, Foramt);
long times = end.getTime() - begin.getTime();
return (int) (times / 60 / 60 / 1000 / 24);
}
}