long available = (long)getAttachmentContent(att.getId()).available();
public static String bytesTrans(long bytes) {
BigDecimal filesize = new BigDecimal(bytes);
BigDecimal megabyte = new BigDecimal(1024 * 1024);
float returnValue = filesize.divide(megabyte, 2, BigDecimal.ROUND_UP).floatValue();
if (returnValue > 1)
return (returnValue + "MB");
BigDecimal kilobyte = new BigDecimal(1024);
returnValue = filesize.divide(kilobyte, 2, BigDecimal.ROUND_UP).floatValue();
return (returnValue + "KB");
}
InputStream有一个available()方法可以拿到int类型的字节数。
方法提供 计算字节数得到浮点型数据