java时间戳转换

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;  

public class DateUtils {  

        /**
         * 返回unix时间戳 (1970年至今的秒数)
         * @return
         */
        public static long getUnixStamp(){
                return System.currentTimeMillis()/1000;
        }  

        /**
         * 得到昨天的日期
         * @return
         */
        public static String getYestoryDate() {
                Calendar calendar = Calendar.getInstance();
                calendar.add(Calendar.DATE,-1);
                SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
                String yestoday = sdf.format(calendar.getTime());
                return yestoday;
        }  

        /**
         * 得到今天的日期
         * @return
         */
        public static  String getTodayDate(){
                SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
                String date = sdf.format(new Date());
                return date;
        }  

        /**
         * 时间戳转化为时间格式
         * @param timeStamp
         * @return
         */
        public static String timeStampToStr(long timeStamp) {
                SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
                String date = sdf.format(timeStamp * 1000);
                return date;
        }  

        /**
         * 得到日期   yyyy-MM-dd
         * @param timeStamp  时间戳
         * @return
         */
        public static String formatDate(long timeStamp) {
                SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
                String date = sdf.format(timeStamp*1000);
                return date;
        }  

        /**
         * 得到时间  HH:mm:ss
         * @param timeStamp   时间戳
         * @return
         */
        public static String getTime(long timeStamp) {
                String time = null;
                SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
                String date = sdf.format(timeStamp * 1000);
                String[] split = date.split("\\s");
                if ( split.length > 1 ){
                        time = split[1];
                }
                return time;
        }  

        /**
         * 将一个时间戳转换成提示性时间字符串，如刚刚，1秒前
         *
         * @param timeStamp
         * @return
         */
        public static String convertTimeToFormat(long timeStamp) {
                long curTime =System.currentTimeMillis() / (long) 1000 ;
                long time = curTime - timeStamp;  

                if (time < 60 && time >= 0) {
                        return "刚刚";
                } else if (time >= 60 && time < 3600) {
                        return time / 60 + "分钟前";
                } else if (time >= 3600 && time < 3600 * 24) {
                        return time / 3600 + "小时前";
                } else if (time >= 3600 * 24 && time < 3600 * 24 * 30) {
                        return time / 3600 / 24 + "天前";
                } else if (time >= 3600 * 24 * 30 && time < 3600 * 24 * 30 * 12) {
                        return time / 3600 / 24 / 30 + "个月前";
                } else if (time >= 3600 * 24 * 30 * 12) {
                        return time / 3600 / 24 / 30 / 12 + "年前";
                } else {
                        return "刚刚";
                }
        }  

        /**
         * 将一个时间戳转换成提示性时间字符串，(多少分钟)
         *
         * @param timeStamp
         * @return
         */
        public static String timeStampToFormat(long timeStamp) {
                long curTime =System.currentTimeMillis() / (long) 1000 ;
                long time = curTime - timeStamp;
                return time/60 + "";
        }  

}