Copy Large File Contents in Java using Apache Commons IO

In this Java tutorial we learn how to copy large files using the IOUtils utility class of Apache Commons IO library.

How to add Apache Commons IO library to your Java project

To use the Apache Commons IO library in the Gradle build project, add the following dependency into the build.gradle file.

implementation 'commons-io:commons-io:2.8.0'

To use the Apache Commons IO library in the Maven build project, add the following dependency into the pom.xml file.

<dependency>
  <groupId>commons-io</groupId>
  <artifactId>commons-io</artifactId>
  <version>2.8.0</version>
</dependency>

To have more information about the Apache Commons IO library you can visit the library home page at commons.apache.org/proper/commons-io/

How to copy large files in Java

The following Java program, we copy the large files using IOUtils.copyLarge() method.

CopyLargeFiles.java

import org.apache.commons.io.IOUtils;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class CopyLargeFiles {
    public static void main(String... args) {
        try {
            InputStream inputStream = new FileInputStream("D:\\Data\\data.txt");
            OutputStream outputStream = new FileOutputStream("D:\\Data\\data-out.txt");

            IOUtils.copyLarge(inputStream, outputStream);

            IOUtils.close(inputStream);
            IOUtils.close(outputStream);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

Happy Coding 😊