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java - 如何通过 url 链接“递归”读取所有文件和文件夹

问题描述

我正在尝试从 URL 下载所有文件。但是，通过chrome开发者工具分析代码，我可以看到我需要的文件在一个路径中，例如：/var/www/html/folders_and_files_that_i_need.

有人有什么想法可以帮助我吗？提前致谢。

我的代码实际上只能下载文件设置绝对路径。

public static void downloadFile(String fileURL, String saveDir) throws IOException {
    URL url = new URL(fileURL);
    HttpURLConnection httpConn = (HttpURLConnection) url.openConnection();
    int responseCode = httpConn.getResponseCode();

    // always check HTTP response code first
    if (responseCode == HttpURLConnection.HTTP_OK) {
        String fileName = "";
        String disposition = httpConn.getHeaderField("Content-Disposition");
        String contentType = httpConn.getContentType();
        int contentLength = httpConn.getContentLength();

        if (disposition != null) {
            // extracts file name from header field
            int index = disposition.indexOf("filename=");
            if (index > 0) {
                fileName = disposition.substring(index + 10, disposition.length() - 1);
            }
        } else {
            // extracts file name from URL
            fileName = fileURL.substring(fileURL.lastIndexOf("/") + 1, fileURL.length());
        }

        System.out.println("Content-Type = " + contentType);
        System.out.println("Content-Disposition = " + disposition);
        System.out.println("Content-Length = " + contentLength);
        System.out.println("fileName = " + fileName);

        // opens input stream from the HTTP connection
        InputStream inputStream = httpConn.getInputStream();
        String saveFilePath = saveDir + File.separator + fileName;

        // opens an output stream to save into file
        FileOutputStream outputStream = new FileOutputStream(saveFilePath);

        int bytesRead = -1;
        byte[] buffer = new byte[BUFFER_SIZE];
        while ((bytesRead = inputStream.read(buffer)) != -1) {
            outputStream.write(buffer, 0, bytesRead);
            System.out.println("buffering");
        }

        outputStream.close();
        inputStream.close();

        System.out.println("Arquivo " + fileName + " baixado");
    } else {
        System.out.println("No file to download. Server replied HTTP code: " + responseCode);
    }
    httpConn.disconnect();
}

标签： javaphpbashfileurl

解决方案

在 REST API 中，您必须拥有单个文件的资源 Java 下载目录中的所有文件和文件夹

可以帮助你。

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