1.复制文件夹

public static void copyDir(String oldPath, String newPath) throws IOException {        File file = new File(oldPath);         //文件名称列表        String[] filePath = file.list();                if (!(new File(newPath)).exists()) {            (new File(newPath)).mkdir();        }                for (int i = 0; i < filePath.length; i++) {            if ((new File(oldPath + file.separator + filePath[i])).isDirectory()) {                copyDir(oldPath  + file.separator  + filePath[i], newpath  + file.separator + filePath[i]);            }                        if (new File(oldPath  + file.separator + filePath[i]).isFile()) {                copyFile(oldPath + file.separator + filePath[i], newpath + file.separator + filePath[i]);            }                    }    }

2. 复制文件的方法

public static void copyFile(String oldPath, String newPath) throws IOException {        File oldFile = new File(oldPath);        File file = new File(newPath);        FileInputStream in = new FileInputStream(oldFile);        FileOutputStream out = new FileOutputStream(file);;        byte[] buffer=new byte[2097152];                while((in.read(buffer)) != -1){            out.write(buffer);        }   }

3. 测试

public static void main(String[] args) throws IOException {        Scanner sc = new Scanner(System.in);        System.out.println("请输入源目录：");        String sourcePath = sc.nextLine();        System.out.println("请输入新目录：");        String path = sc.nextLine();                //String sourcePath = "D://aa";        //String path = "D://bb";                copyDir(sourcePath, path);    }