SimpleDateFormat线程安全

private static final ThreadLocal<SimpleDateFormat> simpleDateFormatThreadLocal = new ThreadLocal<SimpleDateFormat>() {
        protected SimpleDateFormat initialValue() {
            return new SimpleDateFormat("dd/MM/yyyy");
        }
    };

    public String formatDate(Date input) {
        if (input == null) {
            return null;
        }

        return simpleDateFormatThreadLocal.get().format(input);
    }

    public Date parseDate(String input) throws ParseException {
        if (input == null) {
            return null;
        }
        return simpleDateFormatThreadLocal.get().parse(input);
    }

SimpleDateFormat线程安全

原文：http://my.oschina.net/lgscofield/blog/495006