学步园

public static String getReallyFileName(String url) {
        String filename = "";
        URL myURL;
        HttpURLConnection conn = null;
        if (url == null || url.length() < 1) {
            return null;
        }

        try {
            myURL = new URL(url);
            conn = (HttpURLConnection) myURL.openConnection();
            conn.connect();
            conn.getResponseCode();
            URL absUrl = conn.getURL();// 获得真实Url
            Log.e("H3c", "x:" + absUrl);
            // 打印输出服务器Header信息
            // Map<String, List<String>> map = conn.getHeaderFields();
            // for (String str : map.keySet()) {
            // if (str != null) {
            // Log.e("H3c", str + map.get(str));
            // }
            // }
            filename = conn.getHeaderField("Content-Disposition");// 通过Content-Disposition获取文件名，这点跟服务器有关，需要灵活变通
            if (filename == null || filename.length() < 1) {
                filename = absUrl.getFile();
            }
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (conn != null) {
                conn.disconnect();
                conn = null;
            }
        }

        return filename;
    }