用Java上传Youtube帖子
帮助：（有人知道如何用Java编写通过Youtube API上传Youtube视频的POST请求吗
所需POST请求的结构如here所述
不幸的是，我不能使用Youtube Java客户端库，因为我使用的是不支持它们的Android
我在下面尝试了一些代码，但它不起作用（我得到的错误是conn.getResponseCode（）为null）
public void videoUpload() {
HttpURLConnection conn = null;
// BufferedReader br = null;
DataOutputStream dos = null;
InputStream inStream = null;
// InputStream is = null;
// OutputStream os = null;
// boolean ret = false;
// String StrMessage = "";
//file path
// get filename from videoURI
String path = "file:///sdcard/";
String existingFileName = "video.3gp";
File videoFile = new File(path + existingFileName);
// String lineEnd = "\r\n";
String twoHyphens = "--";
String boundary = "b93dcbA3";
String ver = "2";
int bytesRead, bytesAvailable, bufferSize;
byte[] buffer;
int maxBufferSize = 1024;
// String responseFromServer = "";
try {
FileInputStream fileInputStream = new FileInputStream(videoFile);
URL url = new URL("http://uploads.gdata.youtube.com/feeds/api/users/[XXXXXXXXXX]/uploads");
conn = (HttpURLConnection) url.openConnection();
// Allow Inputs
conn.setDoInput(true);
// Allow Outputs
conn.setDoOutput(true);
// Don't use a cached copy.
conn.setUseCaches(false);
// Use a post method.
conn.setRequestMethod("POST");
// conn.setRequestProperty("Connection", "Keep-Alive");
conn.setRequestProperty("Host", "uploads.gdata.youtube.com");
conn.setRequestProperty("Authorization", "GoogleLogin auth=" + token);
conn.setRequestProperty("GData-Version", ver);
conn.setRequestProperty("X-Gdata-Client", clientId);
conn.setRequestProperty("X-GData-Key", "key=" + developerKey);
conn.setRequestProperty("Slug", existingFileName); //fix this
conn.setRequestProperty("Content-Type",
"multipart/related;boundary=" + boundary);
conn.setRequestProperty("Content-Length", new Long(videoFile //and this
.length()).toString());
conn.setRequestProperty("Connection", "close");
//do we not want a boundary string here?
conn.setRequestProperty("Content-Type",
"application/atom+xml; charset=UTF-8");
//and here?
conn.setRequestProperty("Content-Type", "video/3gpp");
conn.setRequestProperty("Content-Transfer-Encoding", "binary");
dos = new DataOutputStream(conn.getOutputStream());
dos.write((twoHyphens + boundary).toString().getBytes());
StringBuilder test_xml = new StringBuilder();
test_xml.append("<?xml version='1.0' encoding='UTF-8'?>\n");
test_xml.append("<entry xmlns=\"http://www.w3.org/2005/Atom\"\n");
test_xml.append("xmlns:media=\"http://search.yahoo.com/mrss/\"\n");
test_xml.append("xmlns:yt=\"http://gdata.youtube.com/schemas/2007\">\n");
test_xml.append("<media:group>\n");
test_xml.append("<media:title type=\"plain\">Test Video</media:title>\n");
test_xml.append("<media:description type=\"plain\">\nTest Video\n</media:description>\n");
test_xml.append("<media:category\n");
test_xml.append("scheme=\"http://gdata.youtube.com/schemas/2007/categories.cat\">People\n");
test_xml.append("</media:category>\n");
test_xml.append("<media:keywords>toast, election, wedding</media:keywords>\n");
test_xml.append("</media:group>\n");
test_xml.append("</entry>");
dos.write(test_xml.toString().getBytes("UTF-8"));
// System.out.println(test_xml.toString());
dos.write((twoHyphens + boundary).toString().getBytes());
// create a buffer of maximum size
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
buffer = new byte[bufferSize];
// read file and write it into form
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
while (bytesRead > 0) {
// dos.flush();
dos.write(buffer, 0, bufferSize);
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
}
// byte [] buf = new byte[2048]; // Transfer in 2k chunks
// int bytesRead = 0;
// while ((bytesRead = fileInputStream.read(buf, 0, buf.length)) >=
// 0) {
// dos.write(buf, 0, bytesRead);
// // dos.flush();
// }
// send multipart form data necesssary after file data
// dos.writeBytes(lineEnd);
// dos.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);
dos.write((twoHyphens + boundary + twoHyphens).toString()
.getBytes());
// close streams
fileInputStream.close();
dos.flush();
dos.close();
} catch (MalformedURLException ex) {
ex.printStackTrace();
} catch (IOException ioe) {
ioe.printStackTrace();
}
int responseCode;
StringBuilder outputBuilder = new StringBuilder();
try {
responseCode = conn.getResponseCode();
if (responseCode == HttpURLConnection.HTTP_OK) {
inStream = conn.getInputStream();
} else {
inStream = conn.getErrorStream();
}
String string;
if (inStream != null) {
BufferedReader reader = new BufferedReader(
new InputStreamReader(inStream));
while (null != (string = reader.readLine())) {
outputBuilder.append(string).append("\n");
}
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
if (inStream != null) {
try {
inStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
System.out.println(outputBuilder.toString());
Log.d(LOG_TAG, outputBuilder.toString());
}
# 1 楼答案
conn.getResponseCode()返回原语int，不能为null。我不确定你说的是哪种错误（NullPointerException？），但是getResponseCode不可能返回null。也许conn本身是空的如果是这样，URL构造函数或URL可能会引发另一个异常。openConnection（）。在这种情况下，您将捕获异常并将堆栈跟踪打印到stdout，但继续使用conn引用，这可能是无效的
# 2 楼答案
我以前使用过Apache文件上载库，它大大简化了文件等的post请求： Apache commons file upload