Here's an example of how to use the CopyUtils class from the org.apache.commons.io package in Java to copy data from an input stream to an output stream:

import org.apache.commons.io.CopyUtils;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

public class Main {
    public static void main(String[] args) {
        String sourceFile = "path/to/source/file";
        String targetFile = "path/to/target/file";
        
        try (FileInputStream fis = new FileInputStream(sourceFile);
             FileOutputStream fos = new FileOutputStream(targetFile)) {
            CopyUtils.copy(fis, fos);
            System.out.println("File copied successfully.");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

This example shows how to use the copy() method from the CopyUtils class to copy data from a source file to a target file. The input stream is created using the FileInputStream class and the output stream is created using the FileOutputStream class.

It's important to note that CopyUtils is deprecated as of commons-io 2.6, you can use IOUtils.copy(input, output) instead which is more efficient and flexible.