无法从保管箱下载文件

debugcn 发表于 Dev

托尼

我在dropbox上有一个公共文件存储，现在我想使用java下载该文件。这是我做的：

   String url = "http://www.dropbox.com/s/vk67dz9ca0oqz37/Chrysanthemum.jpg";
        String filename = "C:\\Users\\Public\\Pictures\\Sample Pictures\\test.jpg";

        try {
            URL download = new URL(url);
            ReadableByteChannel rbc = Channels.newChannel(download.openStream());
            FileOutputStream fileOut = new FileOutputStream(filename);
            fileOut.getChannel().transferFrom(rbc, 0, 1 << 24);
            fileOut.flush();
            fileOut.close();
            rbc.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

但是test.jpg是无效的。怎么了？

反斜杠

当你点击保管箱页“下载原”，你可以看到它您重定向到http小号：//www.dropbox.com/s/vk67dz9ca0oqz37/Chrysanthemum.jpg？dl = 1

因此，请附加?dl=1到您的网址并使用https。

String url = "https://www.dropbox.com/s/vk67dz9ca0oqz37/Chrysanthemum.jpg?dl=1";
String filename = "C:\\Users\\Public\\Pictures\\Sample Pictures\\test.jpg";
try {
    URL download = new URL(url);
    ReadableByteChannel rbc = Channels.newChannel(download.openStream());
    FileOutputStream fileOut = new FileOutputStream(filename);
    fileOut.getChannel().transferFrom(rbc, 0, 1 << 24);
    fileOut.flush();
    fileOut.close();
    rbc.close();
} catch (Exception e) {
    e.printStackTrace();
}

或者，更短：

String url = "https://www.dropbox.com/s/vk67dz9ca0oqz37/Chrysanthemum.jpg?dl=1";
String filename = "C:\\Users\\Public\\Pictures\\Sample Pictures\\test.jpg";
try {
    URL download = new URL(url);
    Path fileOut = new File(filename).toPath();
    Files.copy(download.openStream(), fileOut, StandardCopyOption.REPLACE_EXISTING);
} catch (Exception e) {
    e.printStackTrace();
}

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