HttpURLConnection下载了文件名 [英] HttpURLConnection downloaded file name

问题描述

是否可以获取使用HttpURLConnection下载的文件的名称？

Is it possible to get the name of a file downloaded with HttpURLConnection?

URL url = new URL("http://somesite/getFile?id=12345");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setAllowUserInteraction(false);
conn.setDoInput(true);
conn.setDoOutput(true);
conn.connect();
InputStream is = conn.getInputStream();

在上面的示例中，我无法从URL中提取文件名，但服务器会将文件名以某种方式。

In the example above I cannot extract the file name from the URL, but the server will send me the file name in some way.

推荐答案

你可以使用 HttpURLConnection.getHeaderField（String name）获取 Content-Disposition 标头，通常用于设置文件名：

You could use HttpURLConnection.getHeaderField(String name) to get the Content-Disposition header, which is normally used to set the file name:

String raw = conn.getHeaderField("Content-Disposition");
// raw = "attachment; filename=abc.jpg"
if(raw != null && raw.indexOf("=") != -1) {
    String fileName = raw.split("=")[1]; //getting value after '='
} else {
    // fall back to random generated file name?
}

正如其他答案所指出的那样，服务器可能会返回无效的文件名，但是你可以尝试一下。

As other answer pointed out, the server might return invalid file name, but you could try it.

这篇关于HttpURLConnection下载了文件名的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！