How do I read a file into byte array using Commons IO?

By Wayan in Apache Commons, Commons IO 0 Comment

The following example shows you how to read file contents into byte array. We use the IOUtils class of the commons-io library.

package org.kodejava.commons.io;

import org.apache.commons.io.IOUtils;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

public class FileToByteArray {
    public static void main(String[] args) {
        File file = new File("README.md");
        try {
            InputStream is = new FileInputStream(file);
            byte[] bytes = IOUtils.toByteArray(is);

            System.out.println("Byte array size: " + bytes.length);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

Maven Dependencies

<dependency>
    <groupId>commons-io</groupId>
    <artifactId>commons-io</artifactId>
    <version>2.11.0</version>
</dependency>

Maven Central

Latest posts by Wayan (see all)
Views: 16,387

Leave a Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.