IO流--多级文件夹下的所有目录复制到指定目录下

如题：

/**
 * 将多级目录H:\\aa 目录下，.java 复制到 h:\\cc下
 * @author ZYxiao
 *
 */
public class CopyFileFolder {
public static void main(String[] args) throws IOException {
        File inputFile = new File("h:\\aa");
        File outputFileFolder = new File("h:\\cc");

if(!outputFileFolder.exists()){
            outputFileFolder.mkdir();
        }

        copyFolder(inputFile,outputFileFolder);


    }
/**
 * 判断文件文件夹
 * @param inputFile
 * @param outputFileFolder
 * @throws IOException
 */
private static void copyFolder(File inputFile, File outputFileFolder) throws IOException {
if(inputFile.isDirectory()){
            File fileFolder = new File(outputFileFolder,inputFile.getName());//要在目标文件夹下创建和源文件夹的子文件夹一样的文件夹
            fileFolder.mkdir();

            File[] files=inputFile.listFiles();
for (File file : files) {
                copyFolder(file, fileFolder);  //将子目录复制到新生成的文件夹下
            }
        }else{
            File file = new File(outputFileFolder,inputFile.getName());
            copyFile(inputFile,file);
        }
    }

/**
 * 复制文件
 * @param inputFile
 * @param outputFile
 * @throws IOException
 */
private static void copyFile(File inputFile, File outputFile) throws IOException {
// TODO Auto-generated method stub

        BufferedInputStream bis=new BufferedInputStream(new FileInputStream(inputFile));
        BufferedOutputStream bos=new BufferedOutputStream(new FileOutputStream(outputFile));

byte[] b=new byte[1024];
int len=0;
while((len = bis.read(b))!= -1){
            bos.write(b, 0, len);
        }

        bis.close();
        bos.close();

    }
}