java - 如何在java中下载整个文件夹？

Question

我想从服务器下载整个文件夹/目录。该文件夹包含文件。我尝试使用 zip 功能，但为此我需要提供文件路径而不是文件夹路径。

喜欢 -

BufferedInputStream in = new BufferedInputStream(new FileInputStream("d:\\StoreFiles\\Temp\\profile.txt"));

我想要类似 ("d:\StoreFiles") 的东西，它将下载 Storefiles 文件夹中的所有文件夹以及文件夹内的文件。

我该如何实施？

Answer 1

我建议查看Apache Commons IOFileUtils 来复制目录。它很容易使用。看看javadoc

一些可能派上用场的有用方法（请注意，有几个可用的方法）：

• copyDirectory(File srcDir, File destDir)
• copyDirectory(File srcDir, File destDir, FileFilter filter)

Answer 2

这个怎么样？它递归地进入目录并下载：

  public static void main(String[] args) {
       directoryDownloader(new File("/Users/eugene/Desktop"));
  }

  private static void directoryDownloader(File input){
       if(input.isDirectory()){
           for(File file : input.listFiles()){
               directoryDownloader(file);
           }
       } else {
           downloadFile(input);
       }
}

 private static void downloadFile(File someFile){
     System.out.println("Downloading file : " + someFile.getPath());
 } 

PS如何实现你想要的downloadFile。

Answer 3

我认为这个例子对你有用

public class CopyDirectoryExample
{
    public static void main(String[] args)
    {   
        File srcFolder = new File("c:\\mkyong");
        File destFolder = new File("c:\\mkyong-new");

        //make sure source exists
        if(!srcFolder.exists()){

           System.out.println("Directory does not exist.");
           //just exit
           System.exit(0);

        }else{

           try{
            copyFolder(srcFolder,destFolder);
           }catch(IOException e){
            e.printStackTrace();
            //error, just exit
                System.exit(0);
           }
        }

        System.out.println("Done");
    }

    public static void copyFolder(File src, File dest)
        throws IOException{

        if(src.isDirectory()){

            //if directory not exists, create it
            if(!dest.exists()){
               dest.mkdir();
               System.out.println("Directory copied from " 
                              + src + "  to " + dest);
            }

            //list all the directory contents
            String files[] = src.list();

            for (String file : files) {
               //construct the src and dest file structure
               File srcFile = new File(src, file);
               File destFile = new File(dest, file);
               //recursive copy
               copyFolder(srcFile,destFile);
            }

        }else{
            //if file, then copy it
            //Use bytes stream to support all file types
            InputStream in = new FileInputStream(src);
                OutputStream out = new FileOutputStream(dest); 

                byte[] buffer = new byte[1024];

                int length;
                //copy the file content in bytes 
                while ((length = in.read(buffer)) > 0){
                   out.write(buffer, 0, length);
                }

                in.close();
                out.close();
                System.out.println("File copied from " + src + " to " + dest);
        }
    }
}