/**
* DateUtil工具类API速查表:
* 1.得到当前时间 getCurrentDate()
* 2.得到当前年份字符串 getCurrentYear()
* 3.得到当前月份字符串 getCurrentMonth()
* 4.得到当天字符串 getCurrentDay()
* 5.得到当前星期字符串(星期几) getCurrentWeek()
* 6.Date转化为String formatDate()
* 7.String转化为Date parseDate()
* 8.比较时间大小 compareToDate()
* 9.得到给定时间的给定天数后的日期 getAppointDate()
* 10.获取两个日期之间的天数 getDistanceOfTwoDate()
* 11.获取过去的天数 pastDays()
* 12.获取过去的小时 pastHour()
* 13.获取过去的分钟 pastMinutes()
* 14.得到本周的第一天 getFirstDayOfWeek()
* 15.得到当月第一天 getFirstDayOfMonth()
* 16.得到下月的第一天 getFirstDayOfNextMonth()
* 17.根据生日获取年龄 getAgeByBirthDate()
*/
package com.wf.ew.common.utils;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
/**
* 日期时间工具类
* @author wangfan
* @date 2017-4-1 下午2:37:33
*/
public class DateUtil {
/**
* 得到当前时间(yyyy-MM-dd HH:mm:ss)
* @return
*/
public static String getCurrentDate(){
return formatDate(new Date());
}
/**
* 得到当前时间
* @param formate 格式
* @return
*/
public static String getCurrentDate(String formate){
return formatDate(new Date(),formate);
}
/**
* 得到当前年份字符串
*/
public static String getCurrentYear() {
return formatDate(new Date(), "yyyy");
}
/**
* 得到当前月份字符串
*/
public static String getCurrentMonth() {
return formatDate(new Date(), "MM");
}
/**
* 得到当天字符串
*/
public static String getCurrentDay() {
return formatDate(new Date(), "dd");
}
/**
* 得到当前星期字符串(星期几)
*/
public static String getCurrentWeek() {
return formatDate(new Date(), "E");
}
/**
* Date转化为String
* @param date
* @param formate 格式
* @return
*/
public static String formatDate(Date date, String formate){
SimpleDateFormat sdf = new SimpleDateFormat(formate);
return sdf.format(date);
}
/**
* Date转化为String(yyyy-MM-dd HH:mm:ss)
* @param date
* @return
*/
public static String formatDate(Date date){
return formatDate(date,"yyyy-MM-dd HH:mm:ss");
}
/**
* String转化为Date
* @param date
* @param formate
* @return
*/
public static Date parseDate(String date, String formate){
SimpleDateFormat sdf = new SimpleDateFormat(formate);
try {
return sdf.parse(date);
} catch (ParseException e) {
e.printStackTrace();
}
return null;
}
/**
* String转化为Date
* @param date
* @return
*/
public static Date parseDate(String date){
return parseDate(date, "yyyy-MM-dd HH:mm:ss");
}
/**
* 比较时间大小
* @param first
* @param second
* @return 返回0 first等于second, 返回-1 first小于second,, 返回1 first大于second
*/
public static int compareToDate(String first, String second, String pattern) {
DateFormat df = new SimpleDateFormat(pattern);
Calendar cal1 = Calendar.getInstance();
Calendar cal2 = Calendar.getInstance();
try {
cal1.setTime(df.parse(first));
cal2.setTime(df.parse(second));
} catch (ParseException e) {
e.printStackTrace();
System.out.println("比较时间错误");
}
int result = cal1.compareTo(cal2);
if (result < 0) {
return -1;
} else if (result > 0) {
return 1;
}
return 0;
}
/**
* 比较时间大小
* @param first
* @param second
* @return 返回0 first等于second, 返回-1 first小于second,, 返回1 first大于second
*/
public static int compareToDate(Date first, Date second) {
int result = first.compareTo(second);
if (result < 0) {
return -1;
} else if (result > 0) {
return 1;
}
return 0;
}
/**
* 得到给定时间的给定天数后的日期
* @return
*/
public static Date getAppointDate(Date date, int day){
Calendar calendar=Calendar.getInstance();
calendar.setTime(date);
calendar.add(Calendar.DAY_OF_YEAR, day);
return calendar.getTime();
}
/**
* 获取两个日期之间的天数
* @param before
* @param after
* @return
*/
public static double getDistanceOfTwoDate(Date before, Date after) {
long beforeTime = before.getTime();
long afterTime = after.getTime();
return (afterTime - beforeTime) / (1000 * 60 * 60 * 24);
}
/**
* 获取过去的天数
* @param date
* @return
*/
public static long pastDays(Date date) {
long t = new Date().getTime() - date.getTime();
return t / (24 * 60 * 60 * 1000);
}
/**
* 获取过去的小时
* @param date
* @return
*/
public static long pastHour(Date date) {
long t = new Date().getTime() - date.getTime();
return t / (60 * 60 * 1000);
}
/**
* 获取过去的分钟
* @param date
* @return
*/
public static long pastMinutes(Date date) {
long t = new Date().getTime() - date.getTime();
return t / (60 * 1000);
}
/**
* 得到本周的第一天
* @return
*/
public static Date getFirstDayOfWeek(){
Calendar cal = Calendar.getInstance();
cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
return cal.getTime();
}
/**
* 得到当月第一天
* @return
*/
public static Date getFirstDayOfMonth() {
Calendar cal = Calendar.getInstance();
int firstDay = cal.getMinimum(Calendar.DAY_OF_MONTH);
cal.set(Calendar.DAY_OF_MONTH, firstDay);
return cal.getTime();
}
/**
* 得到下月的第一天
* @return
*/
public static Date getFirstDayOfNextMonth() {
Calendar cal = Calendar.getInstance();
cal.add(Calendar.MONTH, +1);
int firstDay = cal.getMinimum(Calendar.DAY_OF_MONTH);
cal.set(Calendar.DAY_OF_MONTH, firstDay);
return cal.getTime();
}
/**
* 根据生日获取年龄
* @param birtnDay
* @return
*/
public static int getAgeByBirthDate(Date birtnDay) {
Calendar cal = Calendar.getInstance();
if (cal.before(birtnDay)) {
return 0;
}
int yearNow = cal.get(Calendar.YEAR);
int monthNow = cal.get(Calendar.MONTH);
int dayOfMonthNow = cal.get(Calendar.DAY_OF_MONTH);
cal.setTime(birtnDay);
int yearBirth = cal.get(Calendar.YEAR);
int monthBirth = cal.get(Calendar.MONTH);
int dayOfMonthBirth = cal.get(Calendar.DAY_OF_MONTH);
int age = yearNow - yearBirth;
if (monthNow <= monthBirth) {
if (monthNow == monthBirth) {
if (dayOfMonthNow < dayOfMonthBirth) {
age--;
}
} else {
age--;
}
}
return age;
}
}
