In Java, how can I convert an InputStream into a byte array (byte[])?

Question

My background is .net, I'm fairly new to Java. I'm doing some work for our company's java team and the architect needs me to implement a method that takes an InputStream (java.io) object. In order to fulfill the method's purpose I need to convert that into a byte array. Is there an easy way to do this?

Accepted Answer

The simplest way is to create a new `ByteArrayOutputStream`, copy the bytes to that, and then call `toByteArray`:

```
public static byte[] readFully(InputStream input) throws IOException
{
    byte[] buffer = new byte[8192];
    int bytesRead;
    ByteArrayOutputStream output = new ByteArrayOutputStream();
    while ((bytesRead = input.read(buffer)) != -1)
    {
        output.write(buffer, 0, bytesRead);
    }
    return output.toByteArray();
}
```

In Java, how can I convert an InputStream into a byte array (byte[])?

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