joda日期格式转换

    public static String parseDateTime(String date,String formatFrom,String formatTo){
        DateTimeFormatter formatter = DateTimeFormat.forPattern(formatFrom);
        DateTime dt = formatter.parseDateTime(date);
        Date dn=dt.toDate();
        SimpleDateFormat dateFormat = new SimpleDateFormat(formatTo);
        dateFormat.format(dn);
        return dateFormat.format(dn);
    }
    
    public static void main(String[] args) {
        System.out.println(parseDateTime("20080402","yyyyMMdd","yyyy-MM-dd HH:mm:ss"));
    }

输出

2008-04-02 00:00:00

注意，使用了joda插件

import org.joda.time.DateTime;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;