Java 获取固定格式的日期工具类 DateUtil

/* * Created on 2013.04.17 * * TODO To change the template for this generated file go to * Window - Preferences - Java - Code Style - Code Templates */package com.util;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;/** * @author Hua *  * TODO To change the template for this generated type comment go to Window - * Preferences - Java - Code Style - Code Templates */public class DateUtil {public static String getNowDateAndTime() {SimpleDateFormat dateformat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");return dateformat.format(new Date());}public static String getNowTime() {SimpleDateFormat dateformat = new SimpleDateFormat("yyyy-MM-dd H:mm:ss");return dateformat.format(new Date());}public static String getNowHMS() {SimpleDateFormat dateformat = new SimpleDateFormat("HH:mm:ss");return dateformat.format(new Date());}public static String getNowYear() {SimpleDateFormat dateformat = new SimpleDateFormat("yyyy");return dateformat.format(new Date());}public static String getNowMonth() {SimpleDateFormat dateformat = new SimpleDateFormat("MM");return dateformat.format(new Date());}public static String getNowDay() {SimpleDateFormat dateformat = new SimpleDateFormat("dd");return dateformat.format(new Date());}public static String getNowDate() {SimpleDateFormat dateformat = new SimpleDateFormat("yyyy-MM-dd");return dateformat.format(new Date());}public static String getBuinessDate() {SimpleDateFormat dateformat = new SimpleDateFormat("yyyyMMdd");return dateformat.format(new Date());}public static String getBuinessTime() {SimpleDateFormat dateformat = new SimpleDateFormat("H");return dateformat.format(new Date());}public static String getBuinessTimeExact() {SimpleDateFormat dateformat = new SimpleDateFormat("H:mm");return dateformat.format(new Date());}public static String getTomrrowDate() {SimpleDateFormat dateformat = new SimpleDateFormat("yyyyMMdd");Date tomrrow = new Date(new Date().getTime() + 24 * 60 * 60 * 1000);return dateformat.format(tomrrow);}public static String getYesterdayDate(String type, int num) {Date tomrrow = null;SimpleDateFormat dateformat = new SimpleDateFormat("yyyyMMdd");if (type.equals(("add"))) {tomrrow = new Date(new Date().getTime() + 24 * 60 * 60 * 1000 * num);} else if (type.equals(("sub"))) {tomrrow = new Date(new Date().getTime() - 24 * 60 * 60 * 1000 * num);}return dateformat.format(tomrrow);}public static String getYesterdayDate(String date, String type, int num) {Date tomrrow = null;SimpleDateFormat dateformat = new SimpleDateFormat("yyyyMMdd");try {Date temp = dateformat.parse(date);if (type.equals(("add"))) {tomrrow = new Date(temp.getTime() + 24 * 60 * 60 * 1000 * num);} else if (type.equals(("sub"))) {tomrrow = new Date(temp.getTime() - 24 * 60 * 60 * 1000 * num);}} catch (ParseException e) {System.out.println(e.getMessage());return null;}return dateformat.format(tomrrow);}/** * 在一个日期上，加减一定天数.返回一个新的日期 *  * @param 日期字符串 * @param type日期类型：add *            向前 sub向后 * @param 天数 * @return */public static String getDate(String date, String type, int num) {Date tomrrow = null;SimpleDateFormat dateformat = new SimpleDateFormat("yyyyMMdd");try {Date temp = dateformat.parse(date);if (type.equals(("add"))) {tomrrow = new Date(temp.getTime() + 24 * 60 * 60 * 1000 * num);} else if (type.equals(("sub"))) {tomrrow = new Date(temp.getTime() - 24 * 60 * 60 * 1000 * num);}} catch (ParseException e) {System.out.println(e.getMessage());return null;}return dateformat.format(tomrrow);}/** * 在一个日期上，加减一定天数.返回一个新的日期 *  * @param 日期字符串 * @param type日期类型：add *            向前 sub向后 * @param 天数 * @return */public static String getForMatDate(String date, String type, int num) {Date tomrrow = null;SimpleDateFormat dateformat = new SimpleDateFormat("yyyy-MM-dd");try {Date temp = dateformat.parse(date);if (type.equals(("add"))) {tomrrow = new Date(temp.getTime() + 24 * 60 * 60 * 1000 * num);} else if (type.equals(("sub"))) {tomrrow = new Date(temp.getTime() - 24 * 60 * 60 * 1000 * num);}} catch (ParseException e) {System.out.println(e.getMessage());return null;}return dateformat.format(tomrrow);}/** * 根据一个日期得到星期几 *  * @param 日期 * @return */public static String getWeekByDate(Date date) {Calendar c = Calendar.getInstance();c.setTime(date);int dayOfWeek = 0;String dayOfweekStr = "";dayOfWeek = c.get(Calendar.DAY_OF_WEEK);// 根据日期date得到是星期几switch (dayOfWeek) {case 1:dayOfweekStr = "日";break;case 2:dayOfweekStr = "一";break;case 3:dayOfweekStr = "二";break;case 4:dayOfweekStr = "三";break;case 5:dayOfweekStr = "四";break;case 6:dayOfweekStr = "五";break;case 7:dayOfweekStr = "六";break;}return dayOfweekStr;}/** * 判断两个日期相隔多少天 *  * @param 日期 * @return */public static int getBetWeenDateNum(String startDate, String endDate) {int year1 = Integer.parseInt(startDate.substring(0, 4));int month1 = Integer.parseInt(startDate.substring(4, 6));int day1 = Integer.parseInt(startDate.substring(6, 8));int year2 = Integer.parseInt(endDate.substring(0, 4));int month2 = Integer.parseInt(endDate.substring(4, 6));int day2 = Integer.parseInt(endDate.substring(6, 8));Calendar c1 = Calendar.getInstance();c1.set(year1, month1 - 1, day1);Calendar c2 = Calendar.getInstance();c2.set(year2, month2 - 1, day2);int betWeenDays = (int) ((c2.getTimeInMillis() - c1.getTimeInMillis()) / (1000 * 60 * 60 * 24));return betWeenDays;}/** * 日期增加天数后得到新日期 *  * @param 日期 * @return */public static String getNewDate(String dateStr, int addDay) {SimpleDateFormat dateformat = new SimpleDateFormat("yyyyMMdd");Date date = null;try {date = dateformat.parse(dateStr);} catch (ParseException e) {e.printStackTrace();}Calendar c = Calendar.getInstance();c.setTime(date);c.add(Calendar.DATE, addDay);date = c.getTime();String newDate = dateformat.format(date);return newDate;}}