读完本文后：在 Java、Android 上从 Youtube 下载视频的代码
我找到了一种获取youtube下载链接的方法，与此类似： http://o-o---preferred---lax02s10---v9---lscache4.c.youtube.com/videoplayback?upn=7XKwMrZklvQ&sparams=cp%2Cid%2Cip%2Cipbits%2Citag%2Cratebypass%2Csource%2Cupn %2Cexpire&fexp=903903%
我尝试使用
下载视频 public void DownloadFromUrl(String DownloadUrl, String fileName) {
Log.i("DownloadFromUrl","DownloadFromUrl"+DownloadUrl);
try {
File root = android.os.Environment.getExternalStorageDirectory();
File dir = new File (root.getAbsolutePath() + "/youlike");
if(dir.exists()==false) {
dir.mkdirs();
}
URL url = new URL(DownloadUrl); //you can write here any link
File file = new File(dir, fileName);
long startTime = System.currentTimeMillis();
Log.d("DownloadManager", "download begining");
Log.d("DownloadManager", "download url:" + url);
Log.d("DownloadManager", "downloaded file name:" + fileName);
/* Open a connection to that URL. */
URLConnection ucon = url.openConnection();
Log.i("URLConnection","URLConnection Succeed");
/*
* Define InputStreams to read from the URLConnection.
*/
InputStream is = ucon.getInputStream();
BufferedInputStream bis = new BufferedInputStream(is);
Log.i("BufferedInputStream","BufferedInputStream Succeed");
/*
* Read bytes to the Buffer until there is nothing more to read(-1).
*/
ByteArrayBuffer baf = new ByteArrayBuffer(5000);
int current = 0;
while ((current = bis.read()) != -1) {
baf.append((byte) current);
Log.i("ByteArrayBuffer","ByteArrayBuffer Succeed");
}
/* Convert the Bytes read to a String. */
FileOutputStream fos = new FileOutputStream(file);
Log.i("FileOutputStream","FileOutputStream initialized");
fos.write(baf.toByteArray());
Log.i("fos.write(baf.toByteArray());","fos.write(baf.toByteArray()); initialized");
fos.flush();
fos.close();
Log.d("DownloadManager", "download ready in" + ((System.currentTimeMillis() - startTime) / 1000) + " sec");
} catch (IOException e) {
Log.d("DownloadManager", "Error: " + e);
}
}
但它返回一条错误消息给我：java.io.FileNotFoundException 我测试了该网址，我确信它有效。谁能告诉我问题出在哪里？