Java写一个copyFolde将一个文件夹复制到另外一台设备

非常感谢您的提问。以下是一个简单的Java程序，可以将一个文件夹复制到另外一台设备：

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

public class CopyFolder {
    public static void main(String[] args) {
        File sourceFolder = new File("sourceFolder");
        File destinationFolder = new File("destinationFolder");

        try {
            copyFolder(sourceFolder, destinationFolder);
            System.out.println("Folder copied successfully!");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static void copyFolder(File sourceFolder, File destinationFolder) throws IOException {
        if (sourceFolder.isDirectory()) {
            if (!destinationFolder.exists()) {
                destinationFolder.mkdir();
            }

            String[] files = sourceFolder.list();

            for (String file : files) {
                File sourceFile = new File(sourceFolder, file);
                File destinationFile = new File(destinationFolder, file);

                copyFolder(sourceFile, destinationFile);
            }
        } else {
            FileInputStream in = new FileInputStream(sourceFolder);
            FileOutputStream out = new FileOutputStream(destinationFolder);

            byte[] buffer = new byte[1024];

            int length;
            while ((length = in.read(buffer)) > 0) {
                out.write(buffer, 0, length);
            }

            in.close();
            out.close();
        }
    }
}

请注意，您需要将“sourceFolder”和“destinationFolder”替换为您要复制的文件夹的路径和目标路径。此程序使用递归方法来复制整个文件夹。