How Can I Easily Copy an InputStream to an OutputStream in Java?

Writing InputStream Contents to OutputStream with Ease in Java

Copying the contents of an InputStream to an OutputStream in Java is a common task. While it's possible to write byte buffer code, there may be an easier solution.

Consider a scenario where you have an InputStream in and an OutputStream out. The following code exemplifies the conventional approach:

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

Introducing Apache IOUtils

As WMR suggested, Apache's org.apache.commons.io.IOUtils class provides a method called copy(InputStream, OutputStream) that simplifies this task.

Using IOUtils, the code becomes more concise and straightforward:

IOUtils.copy(in, out);
in.close();
out.close();

While using IOUtils is recommended, if you have specific reasons for avoiding it, you can implement your own custom byte buffer code, as shown in the original code snippet.

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