Java program to copy file

Comprehensive List of Java Examples

In this tutorial, we will learn how to copy files using Java.

Java fileThe class does not provide any method to copy a file to another file. But we can useJava I / StreamRead content from one file and write it to another file.

Example: Using I / Stream Copy File

import java.io.FileInputStream;
import java.io.FileOutputStream;
class Main {
　　public static void main(String[] args) {
　　　　byte[] array = new byte[50];
　　　　try {
　　　　　　FileInputStream sourceFile = new FileInputStream("input.txt");
　　　　　　FileOutputStream destFile = new FileOutputStream("newFile");
　　　　　　//Read all data from input.txt
　　　　　　sourceFile.read(array);
　　　　　　//Write all data to newFile
　　　　　　destFile.write(array);
　　　　　　System.out.println("Copy the input.txt file to newFile.");
　　　　　　//　Close the streams
　　　　　　sourceFile.close();
　　　　　　destFile.close();
　　　　}
　　　　catch (Exception e) {
　　　　　　e.getStackTrace();
　　　　}
　　}
}

Output Results

Copy input.txt file to newFile.

In the above example, we use FileInputStream and FileOutputStream to copy one file to another.

Here,

• FileInputStream frominput.txtRead all contents into an array

• FileOutputStream writes all contents of the array to newFile

Cautionary Notes:

• The org.apache.commons.io package's FileUtils class provides a copyFile() method to copy files.

• The java.nio package's Files class provides a copy() method to copy files.
  

Comprehensive List of Java Examples