File to byte[] in Java

java file-io

From JDK 7 you can use Files.readAllBytes(Path).

Example:

import java.io.File;import java.nio.file.Files;File file;// ...(file is initialised)...byte[] fileContent = Files.readAllBytes(file.toPath());

java file-io

It depends on what best means for you. Productivity wise, don't reinvent the wheel and use Apache Commons. Which is here FileUtils.readFileToByteArray(File input).

java file-io

Since JDK 7 - one liner:

byte[] array = Files.readAllBytes(Paths.get("/path/to/file"));

No external dependencies needed.

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