Android 获取下载文件的真实名字

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;
}