Java中对日期的操作（获取、比较、排序、间隔）代码,Java代码库,德仔网

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【Java】 Java中对日期的操作（获取、比较、排序、间隔）
作者: / 发布于2017/10/23/ 726
获取网络时间

private void getNetTime() {  
       TimeZone.setDefault(TimeZone.getTimeZone("GMT+8")); // 时区设置  
       try {  
           URL url = new URL("http://www.baidu.com");//取得资源对象  
           URLConnection uc = url.openConnection();//生成连接对象  
           uc.connect(); //发出连接  
           long ld = uc.getDate(); //取得网站日期时间（时间戳） System.currentTimeMillis()  
           Date date=new Date(ld);  
           SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.CHINA);  
           String currTime = formatter.format(date);  
           System.out.print("currTime=" + currTime);  
       } catch (IOException e) {  
           e.printStackTrace();  
       }  
   }  



时间的比较
import java.text.DateFormat;  
import java.text.ParseException;  
import java.text.SimpleDateFormat;  
import java.util.Calendar;  
import java.util.Date;  
  
  
public class TestTime {  
  
    public static void main(String[] args) {  
        // TODO Auto-generated method stub  
        String firstTime = "2015-01-07 08:52";  
        String secondTime = "2015-01-07 11:53";  
        CompareDateTime(firstTime, secondTime);  
  
        String thirdTime = "2015-01-07 08:52";  
        String fourthTime = "2015-01-07 12:53";  
        CompareDateTime(thirdTime, fourthTime);  
  
        String fifthTime = "2015-01-07 08:52";  
        String sixthTime = "2015-01-07 13:53";  
        CompareDateTime(fifthTime, sixthTime);  
  
        String date1 = "2014-12-03";  
        String date2 = "2015-01-07";  
        System.out.println("天数=="+daysBetween(date1, date2));  
        System.out.println("后一天=="+getSpecifiedDayAfter(date1));  
  
    }  
  
    public static boolean CompareDateTime(String time1, String time2) {  
        boolean isFirstBig = false;  
        DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm");  
        try {  
            Date date1 = dateFormat.parse(time1);  
            Date date2 = dateFormat.parse(time2);  
            System.out.println("date1==" +date1.getTime());  
            System.out.println("date2==" +date2.getTime());  
            // Method 1  
            if (date1.getTime() > date2.getTime()) {  
                System.out.println("M1--date1在date2后");  
                isFirstBig = true;  
            } else if (date1.getTime() < date2.getTime()) {  
                System.out.println("M1--date1在date2前");  
                isFirstBig = false;  
            }  
            // Method 2  
            if (date1.compareTo(date2) == 1) {  
                System.out.println("M2--date1在date2后");  
                isFirstBig = true;  
            } else if (date1.getTime() < date2.getTime()) {  
                System.out.println("M2--date1在date2前");  
                isFirstBig = false;  
            }  
            // Method 3  
            Calendar cal1 = Calendar.getInstance();  
            Calendar cal2 = Calendar.getInstance();  
            cal1.setTime(date1);  
            cal2.setTime(date2);  
            if (cal1.after(cal2)) {  
                System.out.println("M3--date1在date2后");  
            } else {  
                System.out.println("M3--date1在date2前");  
            }  
        } catch (Exception exception) {  
            exception.printStackTrace();  
        }  
        return isFirstBig;  
    }  
      
    /** 
     * 计算两天之间的天数 
     * @param startStr 
     * @param endStr 
     * @return 
     */  
    public static int daysBetween(String startStr, String endStr) {  
        int daysBetween = 0;  
        try {  
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");  
  
            Date date1 = sdf.parse(startStr);  
            Calendar startDate = Calendar.getInstance();  
            startDate.setTime(date1);  
  
            Date date2 = sdf.parse(endStr);  
            Calendar endDate = Calendar.getInstance();  
            endDate.setTime(date2);  
  
            Calendar date = (Calendar) startDate.clone();  
  
            while (date.before(endDate)) {  
                date.add(Calendar.DAY_OF_MONTH, 1);  
                daysBetween++;  
            }  
  
        } catch (ParseException e) {  
            // TODO Auto-generated catch block  
            e.printStackTrace();  
        }  
        return daysBetween;  
    }  
    /**  
     * 获得指定日期的后一天  
     *   
     * @param specifiedDay  
     * @return  
     */    
    public static String getSpecifiedDayAfter(String specifiedDay) {    
        Calendar c = Calendar.getInstance();    
        Date date = null;    
        try {    
            date = new SimpleDateFormat("yy-MM-dd").parse(specifiedDay);    
        } catch (ParseException e) {    
            e.printStackTrace();    
        }    
        c.setTime(date);    
        int day = c.get(Calendar.DATE);    
        c.set(Calendar.DATE, day + 1);    
    
        String dayAfter = new SimpleDateFormat("yyyy-MM-dd")    
                .format(c.getTime());    
        return dayAfter;    
    }    
}  



时间间隔的获取
/** 
     * 两个时间相差距离多少小时 
     *  
     * @param str1 
     *            时间参数 1 格式：1990-01-01 12:00:00 
     * @param str2 
     *            时间参数 2 格式：2009-01-01 12:00:00 
     * @return long[] 返回值为：{天, 时, 分, 秒} 
     */  
    public static long getDistanceTimes(String str1, String str2) {  
        DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");  
        Date one;  
        Date two;  
        long day = 0;  
        long hour = 0;  
        long min = 0;  
        long sec = 0;  
        try {  
            one = df.parse(str1);  
            two = df.parse(str2);  
            long time1 = one.getTime();  
            long time2 = two.getTime();  
            long diff;  
            if (time1 < time2) {  
                diff = time2 - time1;  
            } else {  
                diff = time1 - time2;  
            }  
            day = diff / (24 * 60 * 60 * 1000);  
            hour = (diff / (60 * 60 * 1000) - day * 24);  
            min = ((diff / (60 * 1000)) - day * 24 * 60 - hour * 60);  
            sec = (diff / 1000 - day * 24 * 60 * 60 - hour * 60 * 60 - min * 60);  
        } catch (ParseException e) {  
            e.printStackTrace();  
        }  
        return day*24 + hour;  
    }  




年月日的比较以及日期间隔的获取

/** 
 * 起始年月日yyyy-MM-dd与终止年月日yyyy-MM-dd之间的比较。 
 * 
 * @param DATE1 
 *            格式为yyyy-MM-dd 
 * @param DATE2 
 *            格式为yyyy-MM-dd 
 * @return isFirstBig。 
 */  
@SuppressLint("SimpleDateFormat")  
public static boolean CompareDate(String DATE1, String DATE2) {  
    boolean isFirstBig = false;  
    DateFormat df = new SimpleDateFormat("yyyy-MM-dd");  
    try {  
        Date dt1 = df.parse(DATE1);  
        Date dt2 = df.parse(DATE2);  
        if (dt1.compareTo(dt2) == 1) {  
            System.out.println("dt1 在dt2前");  
            isFirstBig = true;  
        } else if (dt1.getTime() < dt2.getTime()) {  
            System.out.println("dt1在dt2后");  
            isFirstBig = false;  
        }  
    } catch (Exception exception) {  
        exception.printStackTrace();  
    }  
    return isFirstBig;  
}  
/** 
 * 起始年月yyyy-MM与终止月yyyy-MM之间的比较。 
 * 
 * @param DATE1 
 *            格式为yyyy-MM 
 * @param DATE2 
 *            格式为yyyy-MM 
 * @return isFirstBig。 
 */  
@SuppressLint("SimpleDateFormat")  
public static boolean CompareDateMonth(String DATE1, String DATE2) {  
    boolean isFirstBig = false;  
    DateFormat df = new SimpleDateFormat("yyyy-MM");  
    try {  
        Date dt1 = df.parse(DATE1);  
        Date dt2 = df.parse(DATE2);  
        if (dt1.compareTo(dt2) == 1) {  
            System.out.println("dt1 在dt2前");  
            isFirstBig = true;  
        } else if (dt1.getTime() < dt2.getTime()) {  
            System.out.println("dt1在dt2后");  
            isFirstBig = false;  
        }  
    } catch (Exception exception) {  
        exception.printStackTrace();  
    }  
    return isFirstBig;  
}  
  
/** 
 * 起始年月yyyy-MM与终止月yyyy-MM之间跨度的月数。 
 * 
 * @param beginMonth 
 *            格式为yyyy-MM 
 * @param endMonth 
 *            格式为yyyy-MM 
 * @return 整数。 
 */  
public static int getIntervalMonth(String beginMonth, String endMonth) {  
    int intBeginYear = Integer.parseInt(beginMonth.substring(0, 4));  
    int intBeginMonth = Integer.parseInt(beginMonth.substring(beginMonth  
            .indexOf("-") + 1));  
    int intEndYear = Integer.parseInt(endMonth.substring(0, 4));  
    int intEndMonth = Integer.parseInt(endMonth.substring(endMonth  
            .indexOf("-") + 1));  
  
    return ((intEndYear - intBeginYear) * 12)  
            + (intEndMonth - intBeginMonth) + 1;  
}  
/** 
 * 求两个日期相差天数 
 * 
 * @param sd 
 *            起始日期，格式yyyy-MM-dd 
 * @param ed 
 *            终止日期，格式yyyy-MM-dd 
 * @return 两个日期相差天数 
 */  
public static long getIntervalDays(String sd, String ed) {  
    return ((java.sql.Date.valueOf(ed)).getTime() - (java.sql.Date  
            .valueOf(sd)).getTime())  
            / (3600 * 24 * 1000);  
}  
  
/** 
 * 得到指定月的天数 
 * */  
public static int getMonthLastDay(int year, int month)  
{  
    Calendar a = Calendar.getInstance();  
    a.set(Calendar.YEAR, year);  
    a.set(Calendar.MONTH, month - 1);  
    a.set(Calendar.DATE, 1);//把日期设置为当月第一天  
    a.roll(Calendar.DATE, -1);//日期回滚一天，也就是最后一天  
    int maxDate = a.get(Calendar.DATE);  
    return maxDate;  
}  



按照日期排序
public class TimeSort implements Comparator {  
      
    public int compare(Object arg0, Object arg1) {  
        NoteBean user0 = (NoteBean) arg0;  
        NoteBean user1 = (NoteBean) arg1;  
        int flag = user1.getTime().compareTo(user0.getTime());  
        return flag;  
    }  
  
}  

调用方法
TimeSort sort = new TimeSort();  
Collections.sort(beanList, sort);
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