Java日期时间格式化操作DateUtils 的整理

Java日期时间格式化操作DateUtils 的整理

直接上代码，总结了开发过程中经常用到的日期时间格式化操作！

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.concurrent.TimeUnit;


public class DateUtils {


  private static final String[] UNIT_DESC = new String[]{"天", "小时", "分钟", "秒"};

  
  public static String currentYYYYMMDD() {
    return getStrByDate(new Date(), "yyyyMMdd");
  }

  
  public static String currentHHMMSS() {
    return getStrByDate(new Date(), "HHmmss");
  }

  
  public static String currentYYYYMMDDHHmmss() {
    return getStrByDate(new Date(), "yyyyMMddHHmmss");
  }

  
  public static java.util.Date getDateByStr(String strDate, String format) throws ParseException {
    assert strDate != null && format != null;
    SimpleDateFormat simpleDateFormat = new SimpleDateFormat(format);
    return simpleDateFormat.parse(strDate);
  }

  
  public static String getStrByDate(Date date, String format) {
    assert date != null && format != null;
    SimpleDateFormat simpleDateFormat = new SimpleDateFormat(format);
    return simpleDateFormat.format(date);
  }

  
  public static Date getDayOfMonth() {
    Calendar now = Calendar.getInstance();
    return now.getTime();
  }

  
  public static Date getFirstDayOfMonth(Date date) {
    Calendar nowday = Calendar.getInstance();
    nowday.setTime(date);
    nowday.set(Calendar.DATE, 1);// 把日期设置为当月第一天
    return nowday.getTime();
  }

  
  public static Date getLastDayOfMonth(Date date) {
    Calendar nowday = Calendar.getInstance();
    nowday.setTime(date);
    nowday.set(Calendar.DATE, 1);// 把日期设置为当月第一天
    nowday.roll(Calendar.DATE, -1);// 日期回滚一天，也就是最后一天
    return nowday.getTime();
  }

  
  public static String getCurrYear(Date date) {
    Calendar calendar = Calendar.getInstance();
    calendar.setTime(date);
    SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy");
    Date currYear = calendar.getTime();
    return String.valueOf(dateFormat.format(currYear));
  }

  
  public static String getCurrMonth(Date date) {
    Calendar calendar = Calendar.getInstance();
    calendar.setTime(date);
    SimpleDateFormat dateFormat = new SimpleDateFormat("MM");
    Date currMonth = calendar.getTime();
    return String.valueOf(dateFormat.format(currMonth));
  }

  
  public static Date getLastDayByDate(Date d) {
    Calendar newday = Calendar.getInstance();
    newday.setTime(d);
    int lastday;
    int month = newday.get(Calendar.MONTH);
    do {
      lastday = newday.get(Calendar.DAY_OF_MONTH);
      newday.add(Calendar.DAY_OF_MONTH, 1);
    } while (newday.get(Calendar.MONTH) == month);
    newday.set(Calendar.MONTH, month);

    newday.set(Calendar.DAY_OF_MONTH, lastday);
    return newday.getTime();
  }

  
  public static String formatyyyyMMdd(String dateString) throws ParseException {
    SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyyMMdd");
    Date date = simpleDateFormat.parse(dateString);
    SimpleDateFormat formatStr = new SimpleDateFormat("yyyy-MM-dd");
    return formatStr.format(date);
  }

  
  public static String formatyyyyMMddHHmmss(String dateString) throws ParseException {
    SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyyMMddHHmmss");
    Date date = simpleDateFormat.parse(dateString);
    SimpleDateFormat formatStr = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    return formatStr.format(date);
  }

  
  public static int getCurrYear() {
    Calendar calendar = Calendar.getInstance();
    SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy");
    Date currYearFirst = calendar.getTime();
    return Integer.valueOf(dateFormat.format(currYearFirst));
  }

  
  public static Date getLastThreeMonths() {
    Calendar calendar = Calendar.getInstance();

    calendar.add(Calendar.MONTH, -3);
    calendar.add(Calendar.DAY_OF_MONTH, 1);
    return calendar.getTime();
  }

  
  public static Date getLastoneMonths() {
    Calendar calendar = Calendar.getInstance();

    calendar.add(Calendar.MONTH, -1);
    calendar.add(Calendar.DAY_OF_MONTH, 1);
    return calendar.getTime();
  }

  
  public static Date getLastSixMonths() {
    Calendar calendar = Calendar.getInstance();

    calendar.add(Calendar.MONTH, -6);
    calendar.add(Calendar.DAY_OF_MONTH, 1);
    return calendar.getTime();
  }

  
  public static Date getCurrYearFirst(int year) {
    Calendar calendar = Calendar.getInstance();
    calendar.clear();
    calendar.set(Calendar.YEAR, year);
    return calendar.getTime();
  }

  
  public static Date getCurrYearLast(int year) {
    Calendar calendar = Calendar.getInstance();
    calendar.clear();
    calendar.set(Calendar.YEAR, year);
    calendar.roll(Calendar.DAY_OF_YEAR, -1);
    return calendar.getTime();
  }

  
  public static String date2Str(Date date, String format) {
    return getStrByDate(date, format);
  }
  
  


public static String getSpecifiedDayBefore(Date date, String dateFormat){
  if (date == null) return null;
  Calendar c = Calendar.getInstance();
  c.setTime(date);
  int day=c.get(Calendar.DATE);
  c.set(Calendar.DATE,day-1);

  String dayBefore=new SimpleDateFormat(dateFormat).format(c.getTime());
  return dayBefore;
}


public static String getSpecifiedDayAfter(Date date, String dateFormat) {
  if (date == null) return null;
  Calendar c = Calendar.getInstance();
  c.setTime(date);
  int day = c.get(Calendar.DATE);
  c.set(Calendar.DATE, day + 1);
  String dayAfter = new SimpleDateFormat(dateFormat).format(c.getTime());
  return dayAfter;
}

  
  public static String convertSeconds2Str(long seconds) {
    StringBuilder sb = new StringBuilder();
    long[] date = {TimeUnit.SECONDS.toDays(seconds), TimeUnit.SECONDS.toHours(seconds) % 24, TimeUnit.SECONDS.toMinutes(seconds) % 60, TimeUnit.SECONDS.toSeconds(seconds) % 60};
    for (int i = 0; i < date.length; i++) {
      long l = date[i];
      if (l > 0) sb.append(l).append(UNIT_DESC[i]);
    }
    return sb.toString();
  }

  
  public static String convertMinute2Str(long minute) {
    StringBuilder sb = new StringBuilder();
    long[] date = {TimeUnit.SECONDS.toHours(minute) % 24,TimeUnit.SECONDS.toMinutes(minute) % 60, TimeUnit.SECONDS.toSeconds(minute) % 60};
    for (int i = 0; i < date.length; i++) {
      long l = date[i];
      if (l > 0) sb.append(l).append(UNIT_DESC[i]);
    }
    return sb.toString();
  }
}

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