how to get file name from the server request?

问题

I'm trying http requests and create http get request to server. Server must return .zip file. here is the code:

        url = new URL(urlToRead);
        conn = (HttpURLConnection) url.openConnection();
        conn.setRequestMethod("GET");
        is = conn.getInputStream();

then I want to write it to file like this:

    r = 1;
    while(r > 0){
     r = is.read(buf);
     if(r > 0)
    fos.write(buf, 0, r);
   }

but to create fileoutputstream i want to use the file name provided by server. I've found that server answer has the file name and all the structure looks like this:

HTTP/1.1 200 OK
Date: Mon, 07 Apr 2003 14:51:19 GMT
Server: Apache/1.3.20 (Win32) PHP/4.3.0
Last-Modified: Mon, 07 Apr 2003 14:51:00 GMT
Accept-Ranges: bytes
Content-Length: 673
Keep-Alive: timeout=15, max=100
Connection: Keep-Alive
Content-Type: application/zip
Content-Disposition: attachment; filename=test.zip
Pragma: no-cache

....(zip content)

how to get filename?

回答1:

You can use the HttpUrlConnection object's getHeaderField() method to read the Content-Disposition header. Also make sure you handle the case when it is not present.

回答2:

Have you had a look at the methods that HttpURLConnection offers?

Especially the ones that involve headers?

回答3:

if u have servletRequest object(lets say obj) then i think this will help

obj.getRequestURL() ;

来源：https://stackoverflow.com/questions/29622396/how-to-get-file-name-from-the-server-request