1. Overview
In this quick tutorial we’re going to illustrate how to convert a simple byte[] to an InputStream, first using plain java and then the Guava library.
This article is part of the “Java – Back to Basic” series here on Baeldung.
2. Convert Using Java
First – let’s look at the Java solution:
@Test
public void givenUsingPlainJava_whenConvertingByteArrayToInputStream_thenCorrect()
throws IOException {
byte[] initialArray = { 0, 1, 2 };
InputStream targetStream = new ByteArrayInputStream(initialArray);
}3. Convert Using Guava
Next – let’s use wrap the byte array into the Guava ByteSource – which then allows us to get the stream:
@Test
public void givenUsingGuava_whenConvertingByteArrayToInputStream_thenCorrect()
throws IOException {
byte[] initialArray = { 0, 1, 2 };
InputStream targetStream = ByteSource.wrap(initialArray).openStream();
}And there you have it – a simple way of opening an InputStream from a byte array.
