将一个文件夹的文件递归复制到另外一台服务器上，java

可以使用Java的File类和IO流来实现递归复制文件夹。以下是一个示例代码：

import java.io.*;

public class FileCopy {
    public static void main(String[] args) {
        File sourceFolder = new File("sourceFolder");
        File targetFolder = new File("targetFolder");
        copyFolder(sourceFolder, targetFolder);
    }

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

            String[] files = sourceFolder.list();
            for (String file : files) {
                File sourceFile = new File(sourceFolder, file);
                File targetFile = new File(targetFolder, file);
                copyFolder(sourceFile, targetFile);
            }
        } else {
            try {
                InputStream in = new FileInputStream(sourceFolder);
                OutputStream out = new FileOutputStream(targetFolder);

                byte[] buffer = new byte[1024];
                int length;
                while ((length = in.read(buffer)) > 0) {
                    out.write(buffer, 0, length);
                }

                in.close();
                out.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

这个代码会将sourceFolder文件夹中的所有文件和子文件夹递归复制到targetFolder文件夹中。如果targetFolder不存在，会自动创建。