Android 獲取下載文件的真實名字

    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();// 獲得真實Url  
            Log.e("H3c", "x:" + absUrl);  
            // 打印輸出服務器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");// 通過Content-Disposition獲取文件名，這點跟服務器有關，需要靈活變通  
            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;  
    }  </pre>