用python， c#， java写的文件拷贝

     前一段时间试着用这三种语言简单的写了关于文件拷贝的程序，发现c#和python的api惊人的相似，对于文件的操作这两种语言非常的方便。都没有加异常的处理

C#源代码：

        public static void CopyFile(string source, string destination)

        {

            if (string.IsNullOrEmpty(source) | string.IsNullOrEmpty(destination))

            {

                throw new ArgumentNullException("传入的目录不存在");

            }

            if (IsDirectory(source))

            {

                if (IsDirectory(destination))

                {

                    var currentFiles = Directory.GetFiles(source);

                    if (currentFiles.Length > 0)

                    {

                        foreach (var sourceFile in currentFiles)

                        {

                            var fileName = sourceFile

                                .Substring(sourceFile.LastIndexOf('//') + 1);

                            var creatFile = Path.Combine(destination, fileName);

                            File.Copy(sourceFile, creatFile, true);

                        }

                    }

                    var currentDir = Directory.GetDirectories(source);

                    if (currentDir.Length > 0)

                    {

                        foreach (var dir in currentDir)

                        {

                            var dirName = dir.Substring(dir.LastIndexOf('//') + 1);

                            var path = Path.Combine(destination, dirName);

                            var creatDir = Directory.CreateDirectory(path);

                        }

                    }

                }

                else

                {

                    throw new Exception("拷贝文件的目的地路径不正确,不能将目录拷贝到非目录中");

                }

            }

            else

            {

                if (IsDirectory(destination))

                {

                    var fileName = source.Substring(source.LastIndexOf('//') + 1);

                    File.Copy(source, destination + fileName);

                }

                else

                {

                    var desName = destination.Substring(destination.LastIndexOf('//') + 1);

                    File.Copy(source, desName, true);

                }

            }

        }

        public static bool IsDirectory(string path)

        {

            if (Directory.Exists(path))

                return true;

            else

                return false;

        }

java源码：

public static void fileCopy(String source, String destination)

            throws Exception {

        File sourceFile = new File(source);

        if (sourceFile.exists() && sourceFile.canRead()) {

            if (!isFile(source)) {

                if (isFile(destination)) {

                    throw new Exception("目标应该是文件夹");

                } else {

                    File[] sourceFiles = sourceFile.listFiles();

                    for (File file : sourceFiles) {

                        String fileName = file.getName();

                        String desFileName;

                        if (!destination.endsWith(System

                                .getProperty("file.separator")))

                            desFileName = destination

                                    + System.getProperty("file.separator")

                                    + fileName;

                        else

                            desFileName = destination + fileName;

                        if (file.isFile()) {

                            copyFile(file.getName(), desFileName);

                        } else if (file.isDirectory()) {

                            createDirectory(desFileName);

                            fileCopy(source

                                    + System.getProperty("file.separator")

                                    + file.getName(), desFileName);

                        }

                    }

                }

            } else {

                if (isFile(destination)) {

                    copyFile(source, destination);

                } else {

                    String desName = source.substring(source.lastIndexOf(System

                            .getProperty("file.separator")));

                    // 注意

                    copyFile(source, destination

                            + System.getProperty("file.separator") + desName);

                }

            }

        } else {

            throw new Exception("传入参数非法");

        }

    }

    public static boolean isFile(String path) {

        File file = new File(path);

        if (file.isFile())

            return true;

        else

            return false;

    }

    public static void copyFile(String from, String to) {

        try {

            FileInputStream fFrom;

            FileOutputStream fTo;

            File file = new File(to);

            if (file.isFile()) {

                fTo = new FileOutputStream(to);

            } else {

                String fileName = new File(from).getName();

                new File(fileName).createNewFile();

                fTo = new FileOutputStream(to+fileName);

            }

            fFrom = new FileInputStream(from);

            byte bt[] = new byte[1024];

            int c;

            while ((c = fFrom.read(bt)) > 0) {

                fTo.write(bt, 0, c);

            }

            fFrom.close();

            fTo.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

    public static boolean createDirectory(String dirName) {

        return new File(dirName).mkdir();

    }

python源码：

def file_copy(source, destination):

    if(os.path.isdir(source)):

        if(os.path.isdir(destination)):

            currentFiles = os.listdir(source)

            for file in currentFiles:

                currentFile = os.path.join(source, file)

                destFile = os.path.join(destination, file)

                if(os.path.isfile(currentFile)):

                    shutil.copyfile(currentFile, destFile)

                else:

                    os.mkdir(destFile)

                    file_copy(currentFile, destFile)               

        else:

            print "The destination is not a directory or not exit"

    else:

        if(os.path.isdir(destination)):

            fileName = os.path.split(source)[1]

            desName = os.path.join(destination, fileName)

            shutil.copy(source, desName)

        else:

            shutil.copy(source, destination)