Java日期操作方法工具类实例【包含日期比较大小，相加减，判断，验证，获取年份等】

package com.gcloud.common;
import org.apache.http.util.TextUtils;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.regex.Pattern;
/**
 * 日期时间工具类
 * Created by charlin on 2017/9/3.
 */
public class DateUtil {
 public static final String CHINA_DATE_FORMAT = "yyyy年MM月dd日";
 public static final String DATETIME_FORMAT = "yyyy-MM-dd HH:mm:ss";
 public static final String DATE_FORMAT = "yyyy-MM-dd";
 public static final String TIME_FORMAT = "HH:mm:ss";
 //----------------判断-----------------------------------------------
 /**
 * 是否是润年
 * @param yearNum
 * @return
 */
 public static boolean isLeapYear(int yearNum) {
 boolean isLeep = false;
 if ((yearNum % 4 == 0) && (yearNum % 100 != 0))
  isLeep = true;
 else if (yearNum % 400 == 0)
  isLeep = true;
 else {
  isLeep = false;
 }
 return isLeep;
 }
 /**
 * 判断是否是日期
 *
 * @param date
 * @return
 */
 public static boolean isDate(String date) {
 //判断年月日的正则表达式，接受输入格式为2010-12-24，可接受平年闰年的日期
 String regex = "(([0-9]{3}[1-9]|[0-9]{2}[1-9][0-9]{1}|[0-9]{1}[1-9][0-9]{2}|[1-9][0-9]{3})-(((0[13578]|1[02])-(0[1-9]|[12][0-9]|3[01]))|((0[469]|11)-(0[1-9]|[12][0-9]|30))|(02-(0[1-9]|[1][0-9]|2[0-8]))))|((([0-9]{2})(0[48]|[2468][048]|[13579][26])|((0[48]|[2468][048]|[3579][26])00))-02-29)";
 Pattern pattern = Pattern.compile(regex);
 return pattern.matcher(date).matches();
 }
 /**
 * 验证是不是生日
 *
 * @param birthday
 * @return
 */
 public static boolean verifyBirthDay(String birthday) {
 if (TextUtils.isEmpty(birthday)) return false;
 if (!birthday.contains("-")) return false;
 String[] arr = birthday.split("-");
 if (null == arr || arr.length != 3 || arr[0].length() != 4 || arr[1].length() != 2 || arr[2].length() != 2)
  return false;
 int year = getYear(new Date());
 int birthYear = Integer.parseInt(arr[0]);
 if (birthYear <= 1900 || birthYear > year) return false;
 String curDate = formatDate(new Date(), DATE_FORMAT);
 if (birthday.compareTo(curDate) > 0) return false;
 return isDate(birthday);
 }
 //-------------------自动转化--------------------------------------------
 /**
 * 把字符串自动转化为时间格式
 *
 * @param dateStr
 * @return
 */
 public static Date parseDateByAuto(String dateStr) {
 if (StringUtil.isEmpty(dateStr)) {
  return null;
 }
 String format = DATE_FORMAT;
 if (dateStr.indexOf("/") > -1) {
  format = format.replace("-", "/");
 }
 if (dateStr.indexOf(":") != -1) {
  format += " HH:mm";
 }
 //存在秒
 if (dateStr.indexOf(":") != dateStr.lastIndexOf(":")) {
  format += ":ss";
 }
 return parseDate(dateStr, format);
 }
 /**
 * 自动识别格式
 * @param date
 * @return
 */
 public static String formatDateByAuto(Date date){
 String format = DATE_FORMAT;
 if( !(date instanceof java.sql.Date) && (date.getSeconds()>0||date.getMinutes()>0||date.getHours()>0)){
  format = DATETIME_FORMAT;
 }
 return formatDate(date, format);
 }
 //------------当前日期与时间 --------------------------------
 /**取当前日期*/
 public static Date getCurrDate() {return parseDate(formatDate(new Date())); }
 /**取当前时间*/
 public static Date getCurrDateTime() {return parseDate(formatDate(new Date())); }
 /**取当前日期*/
 public static String getCurrDateStr() { return formatDate(new Date()); }
 /**取当前时间*/
 public static String getCurrDateTimeStr() { return formatDate(new Date(), DATETIME_FORMAT);}
 public static String formatCurrDate() {return formatDate(new Date(),DATE_FORMAT); }
 public static String formatCurrDateTime() {return formatDate(new Date(),DATETIME_FORMAT);}
 public static String formatCurrDateToS(String strFormat) {return formatDate(new Date(), strFormat); }
 //-----------时间计算--------------------------------------------
 /**
 * 时间相减
 * @param strDateBegin
 * @param strDateEnd
 * @param iType
 * @return
 */
 public static int getDiffDate(String strDateBegin, String strDateEnd, int iType) {
 Calendar calBegin = Calendar.getInstance();
 calBegin.setTime(parseDate(strDateBegin, DATETIME_FORMAT));
 Calendar calEnd = Calendar.getInstance();
 calBegin.setTime(parseDate(strDateEnd, DATETIME_FORMAT));
 long lBegin = calBegin.getTimeInMillis();
 long lEnd = calEnd.getTimeInMillis();
 if (iType == Calendar.SECOND)
  return (int) ((lEnd - lBegin) / 1000L);
 if (iType == Calendar.MINUTE)
  return (int) ((lEnd - lBegin) / 60000L);
 if (iType == Calendar.HOUR)
  return (int) ((lEnd - lBegin) / 3600000L);
 if (iType == Calendar.DAY_OF_MONTH) {
  return (int) ((lEnd - lBegin) / 86400000L);
 }
 return -1;
 }
 /**
 * 添加天数或月份或年得到新的时间
 *
 * @param strDate
 * @param count
 * @param dayType Calendar.YEAR
 * @return
 */
 public static String getAddDateTime(String strDate, int count, int dayType) {
 Calendar cal = Calendar.getInstance();
 cal.setTime(parseDate(strDate));
 cal.add(dayType, count);
 SimpleDateFormat sdf = null;
 if ((dayType == Calendar.YEAR) || (dayType == Calendar.MONTH) || (dayType == Calendar.DAY_OF_MONTH))
  sdf = new SimpleDateFormat(DATE_FORMAT);
 else
  sdf = new SimpleDateFormat(DATETIME_FORMAT);
 return sdf.format(cal.getTime());
 }
 /**
 * 日期增加天数
 * @param date
 * @param iCount
 * @return
 */
 public static Date getAddDate(Date date, int iCount) {
 Calendar cal = Calendar.getInstance();
 cal.setTime(date);
 cal.add(Calendar.DAY_OF_MONTH, iCount);
 return cal.getTime();
 }
 /**
 * 比较日期
 *
 * @param dateStr1
 * @param dateStr2
 * @return
 */
 public static int compareDate(String dateStr1, String dateStr2) {
 Date date1 = parseDate(dateStr1);
 Date date2 = parseDate(dateStr2);
 if (date1.getTime() > date2.getTime())
  return -1;
 else if (date1.getTime()  date2.getTime())
  return -1;
 else if (date1.getTime()