时间类型，精度问题（Timestamp,Date)

经过调试，发现最后转换器会进入com.opensymphony.xwork.util.XWorkBasicConverter类(xwork.jar包）的对应的doConvertToDate方法，该方法内容：

private Object doConvertToDate(Map context, Object value, Class toType) {
        Date result = null;

        if (value instanceof String && value != null && ((String)value).length() > 0) {
            String sa = (String) value;
            Locale locale = getLocale(context);

            DateFormat df = null;
            if (java.sql.Time.class == toType) {
                df = DateFormat.getTimeInstance(DateFormat.MEDIUM, locale);
            } else if (java.sql.Timestamp.class == toType) {
                Date check = null;
                SimpleDateFormat dtfmt = (SimpleDateFormat) DateFormat.getDateTimeInstance(DateFormat.SHORT,
                        DateFormat.MEDIUM,
                        locale);
                SimpleDateFormat fullfmt = new SimpleDateFormat(dtfmt.toPattern() + MILLISECOND_FORMAT,
                        locale);

                SimpleDateFormat dfmt = (SimpleDateFormat) DateFormat.getDateInstance(DateFormat.SHORT,
                        locale);

                SimpleDateFormat rfc3339Format = new SimpleDateFormat(RFC3339_FORMAT);

                SimpleDateFormat[] fmts = {fullfmt, dtfmt, dfmt, rfc3339Format};
                for (int i = 0; i < fmts.length; i++) {
                    try {
                         //可以发现这里它会使用上面四种格式进行格式化（格式化失败进入异常），因此只有一个格式化会成功。我在页面中使用的<ww:datepicker name="act.actDate" label="活动时间"
format="%Y-%m-%d %H:%M" showstime="24">
</ww:datepicker>
只会被第三个格式化，而第三个格式化会被切去时间，所有出现了精度问题。
                        check = fmts[i].parse(sa);
                        df = fmts[i];
                        if (check != null) {
                            break;
                        }
                    } catch (ParseException ignore) {
                    }
                }
             } else if(java.util.Date.class == toType) {
            Date check = null;
                SimpleDateFormat d1 = (SimpleDateFormat)DateFormat.getDateTimeInstance(DateFormat.SHORT, DateFormat.LONG, locale);
                SimpleDateFormat d2 = (SimpleDateFormat)DateFormat.getDateTimeInstance(DateFormat.SHORT, DateFormat.MEDIUM, locale);
                SimpleDateFormat d3 = (SimpleDateFormat)DateFormat.getDateTimeInstance(DateFormat.SHORT, DateFormat.SHORT, locale);
                SimpleDateFormat rfc3339Format = new SimpleDateFormat(RFC3339_FORMAT);
                SimpleDateFormat[] dfs = {d1, d2, d3, rfc3339Format}; //added RFC 3339 date format (XW-473)
                for (int i = 0; i < dfs.length; i++) {
                try {
                check = dfs[i].parse(sa);
                df = dfs[i];
                if (check != null) {
                break;
                }
                }
                catch (ParseException ignore) {
                }
                }
            }
            //final fallback for dates without time
            if (df == null){
            df = DateFormat.getDateInstance(DateFormat.SHORT, locale);
            }
            try {
            df.setLenient(false); // let's use strict parsing (XW-341)
                result = df.parse(sa);
                if (! (Date.class == toType)) {
                    try {
                        Constructor constructor = toType.getConstructor(new Class[]{long.class});
                        return constructor.newInstance(new Object[]{new Long(result.getTime())});
                    } catch (Exception e) {
                        throw new XworkException("Couldn't create class " + toType + " using default (long) constructor", e);
                    }
                }
            } catch (ParseException e) {
                throw new XworkException("Could not parse date", e);
            }
        } else if (Date.class.isAssignableFrom(value.getClass())) {
            result = (Date) value;
        }
        return result;
    }