<dependency>
    <groupId>commons-io</groupId>
    <artifactId>commons-io</artifactId>
    <version>2.6</version>
</dependency>

import java.io.File;
import java.io.IOException;

import org.apache.commons.io.FileUtils;

public class CopyFile {

    public static void main(String[] args) {
        File sourceFile = new File("1.txt");
        File destFile = new File("2.txt");
        try {
            FileUtils.copyFile(sourceFile, destFile);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}

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