java Date、String、Long三种日期类型相互转换

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

public class DateUtils {

//java Data、String、Long三种日期类型之间的相互转换

/**
* String-->Date
* @param time   待转化的String格式的时间
* @param formatType  time的时间格式
* @return
*/
public static Date  StringToDate(String time,String formatType){

SimpleDateFormat formatter = new SimpleDateFormat(formatType);
Date date = null;
try {
if(time!=null){
date = formatter.parse(time);
}
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return date;
}

/**
* Date-->String
* @param date
* @param formatType
* @return
*/
public static String DateToString(Date date,String formatType){
if(date!=null){
return new SimpleDateFormat(formatType).format(date);
}
return null;
}

public static long DateToLong(Date date){
if(date!=null){
return date.getTime();
}
return 0;

}

public static Date LongToDate(long num){

Date date=new Date(num);
return date;

}

public static long StringToLong(String time, String formatType){
if(time!=null){
Date date=StringToDate(time, formatType);
return date.getTime();
}
return 0;
}

public static String LongToString(long num, String formatType){
Date date=LongToDate(num);
return DateToString(date, formatType);

}
}