Monday, 14 November 2011

Java: Save InputStream Into File

Imagine we need to save an InputStream into file. That can happen when requesting some url, or when just copying the file from one place to another on hard disk. There are a lot of answers provided by google on request java save inputstream to file. I have checked the first result page and everywhere almost 1 and the same solution is provided, which includes the following loop:

int read = 0;
byte[] bytes = new byte[1024];
while ((read = != -1) {
 out.write(bytes, 0, read);

Seriously, guys, don't you think there is something wrong here? Even in C++ people do not copy streams by operating bytes anymore! There should be a lot better way :) (I am not considering now usage of any additional libraries that require some additional jar files).

import sun.misc.IOUtils;

new FileOutputStream("tmp.txt").write(IOUtils.readFully(inputStream, -1, false));