我们如何将大块文件以块的形式上传到PHP服务器,以便在连接中断时,可以随时恢复上传。
具体来说,Android中需要哪些库来执行此操作?
用户正在从互联网连接缓慢/不稳定的国家/地区上传大文件。谢谢
修改
更多信息,我目前正在使用HTTP POST一次上传整个文件。如下面的代码所示:
private int uploadFiles(File file) {
String zipName = file.getAbsolutePath() + ".zip";
if(!zipFiles(file.listFiles(), zipName)){
//return -1;
publishResults(-1);
}
//publishProgress(-1, 100);
HttpURLConnection connection = null;
DataOutputStream outputStream = null;
DataInputStream inputStream = null;
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
String serverUrl = prefs.getString("serverUrl", "ServerGoesHere"); // todo ensure that a valid string is always stored
String lineEnd = "\r\n";
String twoHyphens = "--";
String boundary = "*****";
int bytesRead, bytesAvailable, bufferSize;
byte[] buffer;
int maxBufferSize = 1 * 1024 * 1024;
int responseCode = -1;
try {
//notif title, undeterministic
pNotif.setContentText("Zipping complete. Now Uploading...")
.setProgress(0, 0, true);
mNotifyManager.notify(NOTIFICATION_ID, pNotif.build()); // make undeterministic
//update progress bar to indeterminate
sendUpdate(0, 0, "Uploading file."); // sendupdate using intent extras
File uploadFile = new File(zipName);
long totalBytes = uploadFile.length();
FileInputStream fileInputStream = new FileInputStream(uploadFile);
URL url = new URL(serverUrl);
connection = (HttpURLConnection) url.openConnection();
connection.setDoInput(true);
connection.setDoOutput(true);
connection.setUseCaches(false);
connection.setRequestMethod("POST");
connection.setRequestProperty("Connection", "Keep-Alive");
connection.setRequestProperty("Content-Type",
"multipart/form-data;boundary=" + boundary);
outputStream = new DataOutputStream(connection.getOutputStream());
outputStream.writeBytes(twoHyphens + boundary + lineEnd);
outputStream
.writeBytes("Content-Disposition: form-data; name=\"uploadedfile\";filename=\""
+ zipName + "\"" + lineEnd);
outputStream.writeBytes(lineEnd);
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
buffer = new byte[bufferSize];
long bytesUploaded = 0;
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
while (bytesRead > 0) {
bytesUploaded += bytesRead;
outputStream.write(buffer, 0, bufferSize);
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
//int percentCompleted = (int) ((100 * bytesUploaded) / totalBytes);
//publishProgress((int)bytesUploaded/1024, (int)totalBytes/1024);
System.out.println("bytesRead> " + bytesRead);
}
//publishProgress(-2, 1); // switch to clean up
outputStream.writeBytes(lineEnd);
outputStream.writeBytes(twoHyphens + boundary + twoHyphens
+ lineEnd);
try {
responseCode = connection.getResponseCode();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
fileInputStream.close();
outputStream.flush();
outputStream.close();
// Delete the zip file
new File(zipName).delete();
} catch (Exception ex) {
new File(zipName).delete();
responseCode = -1;
ex.printStackTrace();
}
return responseCode;
}
有没有办法修改它以通过块发送它?我所做的大部分研究都不是很清楚,对不起
答案 0 :(得分:0)
通过HTTP上传文件不是一个好主意,因为它是无状态协议,您需要为要发送到服务器的每个块建立新连接。此外,您必须手动保持此传输之间的状态,并且无法保证文件将按其发送顺序到达。
您应该使用TCP套接字进行套接字编程,该套接字在发送整个文件之前保持连接。然后,您可以将块推入套接字,它们将无损地到达,并按照相同的顺序将它们送入套接字。
答案 1 :(得分:0)
我最终使用SFTP库实现了可恢复的上传。 JSch http://www.jcraft.com/jsch/ 我使用SFTP上传,库处理可恢复模式。示例代码:
JSch jsch = new JSch();
session = jsch.getSession(FTPS_USER,FTPS_HOST,FTPS_PORT);
session.setPassword(FTPS_PASS);
java.util.Properties config = new java.util.Properties();
config.put("StrictHostKeyChecking", "no");
session.setConfig(config);
session.connect();
channel = session.openChannel("sftp");
channel.connect();
channelSftp = (ChannelSftp)channel;
channelSftp.cd(FTPS_PATH);
File uploadFile = new File(zipName); // File to upload
totalSize = uploadFile.length(); // size of file
// If part of the file has been uploaded, it saves the number of bytes. Else 0
try {
totalTransfer = channelSftp.lstat(uploadFile.getName()).getSize();
} catch (Exception e) {
totalTransfer = 0;
}
// Upload File with the resumable attribute
channelSftp.put(new FileInputStream(uploadFile), uploadFile.getName(), new SystemOutProgressMonitor(), ChannelSftp.RESUME);
channelSftp.exit();
session.disconnect();
通过这个库,我满足了所有要求:可恢复的上传和上传进度。