1 import java.text.ParseException; 2 import java.text.SimpleDateFormat; 3 import java.util.Date; 4  5 public class DateUtil { 6      7     private static SimpleDateFormat sf = null; 8      9     /**10      * 获取系统时间 11      */12     public static String getCurrentDate() {13         Date d = new Date();14          sf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");15         return sf.format(d);16     }17                                       18     /**19      * 时间戳转换成字符串20      */21     public static String getDateToString(long time) {22         Date d = new Date(time);23         sf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");24         return sf.format(d);25     }26 27     /**28      * 将字符串转为时间戳29      */30     public static long getStringToDate(String time) {31         sf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");32         Date date = new Date();33         try{34             date = sf.parse(time);35         } catch(ParseException e) {36             e.printStackTrace();37         }38         return date.getTime();39     }40     41     /**42      * 直接获取时间戳43      */44     public static String getTimeStamp() {45         String currentDate = getCurrentDate();46         sf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");47         Date date = new Date();48         try{49             date = sf.parse(currentDate);50         } catch(ParseException e) {51             e.printStackTrace();52         }53         return String.valueOf(date.getTime());54     }55     56 }