Java NIO File Copy

Before Java 7, if we need to copy a file we need to make a method or call the copyFile(File srcFile, File destFile) method of FileUtils using Apache commons io package. In Java 7, file copy function is very simple, let’s consider the following example:

import java.nio.file.StandardCopyOption;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

public class FileCopier {

  private void copy(Path source, Path target){
    try {
      Files.copy(source, target, StandardCopyOption.REPLACE_EXISTING);
      System.out.println("file: " + source + " was copied successfully");
    } catch (IOException ioe) {
      System.out.println("Error: " + ioe.getMessage());
    }
  }

  public static void main(String[] args) {
    Path source = Paths.get("source/HappyFace.jpg");
    Path target = Paths.get("destination/HappyFace.jpg");
    FileCopier fileCopier = new FileCopier();
    fileCopier.copy(source, target);
  }

}

One notable option that we have used is the usage of the static variable REPLACE_EXISTING of StandardCopyOption class of java.nio.file package.

In some cases we get an InputStream since is used to read data from a source, java.nio.file.Files also support to copy from an InputStream to a path: copy(InputStream in, Path target, CopyOption... options), see here for more information.

To download the code:

git clone https://github.com/josdem/java-topics.git
cd java-nio-copy

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