MyTimeUtil时间工具类

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MyTimeUtil.java
import java.sql.Timestamp;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;public class MyTimeUtil {  private static SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");  public static Timestamp stringToTimestamp(String format,String time) throws ParseException{ if(time==null) return null; SimpleDateFormat simpleDateFormat = new SimpleDateFormat(format); Date date =  simpleDateFormat.parse(time); Timestamp timestamp = new Timestamp(date.getTime()); return timestamp;  }     /** * 得到当前时间 * 返回 2016-02-19 14:37:23格式的时间 * */  public static String getNowTime(){   return simpleDateFormat.format(new Date());  }    /**   * 得到下一个时间   * currentTime 当前时间   * interval 时间间隔（毫秒）   * */  public static Timestamp getNextTime(Timestamp currentTime,int interval){  if(currentTime == null) return null;  int intervalSecond = interval / 1000;  Calendar calendar = Calendar.getInstance();  calendar.setTime(new Date(currentTime.getTime()));  calendar.add(Calendar.SECOND, intervalSecond);  return new Timestamp(calendar.getTimeInMillis() );  }    /**   * 得到上一个时间   * currentTime 当前时间   * interval 时间间隔（毫秒）   * */  public static Timestamp getPreviousTime(Timestamp currentTime,int interval){  if(currentTime == null) return null;  int intervalSecond = interval / 1000;  Calendar calendar = Calendar.getInstance();  calendar.setTime(new Date(currentTime.getTime()));  calendar.set(Calendar.SECOND,calendar.get(Calendar.SECOND) - intervalSecond);  return new Timestamp(calendar.getTimeInMillis() );  }    /**   * 得到上一个时间   * currentTime 当前时间   * interval 时间间隔（分钟)   * */  public static Timestamp getPreviousTimeByMinute(Timestamp currentTime,int interval){  if(currentTime == null) return null;  Calendar calendar = Calendar.getInstance();  calendar.setTime(new Date(currentTime.getTime()));  calendar.set(Calendar.MINUTE,calendar.get(Calendar.MINUTE) - interval);  return new Timestamp(calendar.getTimeInMillis() );  }    /**   * 将timeStamp转为string   * */  public static String timeStampToString(String format,Timestamp timestamp){ if(timestamp == null || format == null) return null; Date date = new Date(timestamp.getTime()); SimpleDateFormat simpleDateFormat = new SimpleDateFormat(format);  String time = null; try{ time  = simpleDateFormat.format(date); }catch(Exception e){ e.printStackTrace(); } return time;  }    }
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