How Can I Efficiently Transfer InputStream Content to OutputStream in Java?

Effortless Method for Transferring InputStream Content to OutputStream in Java

In Java, you may occasionally require a seamless way to write the contents of an InputStream to an OutputStream. Surprisingly, finding a straightforward solution for this task can be elusive. While manually implementing byte buffer code is manageable, there may be a more elegant approach that simply escapes your attention.

Let's consider a scenario with an InputStream named 'in' and an OutputStream named 'out'. To transfer the content effectively, you might instinctively write code similar to the following:

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

However, there's a more concise way to achieve this functionality, as suggested by WMR. By leveraging the org.apache.commons.io.IOUtils from Apache, you can utilize the 'copy(InputStream, OutputStream)' method, which effortlessly handles the transfer task for you.

With this method, your code becomes incredibly succinct:

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

No more laborious buffer management, just a single line that takes care of everything. And to address your concern, there seems to be no compelling reason to avoid using IOUtils for such a straightforward task. Its inclusion in your codebase can greatly simplify your data transfer operations.

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