mirror of
https://codeberg.org/Mercury-IM/Smack
synced 2024-11-10 18:15:58 +01:00
155 lines
6.3 KiB
Markdown
155 lines
6.3 KiB
Markdown
File Transfer
|
|
=============
|
|
|
|
[Back](index.md)
|
|
|
|
The file transfer extension allows the user to transmit and receive files.
|
|
|
|
* Send a file to another user
|
|
* Receiving a file from another user
|
|
* Monitoring the progress of a file transfer
|
|
|
|
**XEP related:** [XEP-95](http://www.xmpp.org/extensions/xep-0095.html) [XEP-96](http://www.xmpp.org/extensions/xep-0096.html) [XEP-65](http://www.xmpp.org/extensions/xep-0065.html) [XEP-47](http://www.xmpp.org/extensions/xep-0047.html)
|
|
|
|
Send a file to another user
|
|
---------------------------
|
|
|
|
**Description**
|
|
|
|
A user may wish to send a file to another user. The other user has the option
|
|
of accepting, rejecting, or ignoring the users request. Smack provides a
|
|
simple interface in order to enable the user to easily send a file.
|
|
|
|
**Usage**
|
|
|
|
In order to send a file you must first construct an instance of the
|
|
**_FileTransferManager_** class. In order to instantiate the manager
|
|
you should call _FileTransferManager.getInstanceFor(connection)_, where connection is an XMPPConnection instance.
|
|
|
|
Once you have your **_FileTransferManager_** you will need to create an
|
|
outgoing file transfer to send a file. The method to use on the
|
|
**_FileTransferManager_** is the **createOutgoingFileTransfer(userID)**
|
|
method. The userID you provide to this method is the fully-qualified jabber ID
|
|
of the user you wish to send the file to. A fully-qualified jabber ID consists
|
|
of a node, a domain, and a resource. The user must be connected to the
|
|
resource in order to be able to receive the file transfer.
|
|
|
|
Now that you have your **_OutgoingFileTransfer_** instance you will want to
|
|
send the file. The method to send a file is **sendFile(file, description)**.
|
|
The file you provide to this method should be a readable file on the local
|
|
file system, and the description is a short description of the file to help
|
|
the user decide whether or not they would like to recieve the file.
|
|
|
|
For information on monitoring the progress of a file transfer see the
|
|
monitoring progress section of this document.
|
|
|
|
Other means to send a file are also provided as part of the
|
|
**_OutgoingFileTransfer_**. Please consult the Javadoc for more information.
|
|
|
|
**Examples**
|
|
|
|
In this example we can see how to send a file:
|
|
|
|
```
|
|
// Create the file transfer manager
|
|
FileTransferManager manager = FileTransferManager.getInstanceFor(connection);
|
|
// Create the outgoing file transfer
|
|
OutgoingFileTransfer transfer = manager.createOutgoingFileTransfer(entityFullJid);
|
|
// Send the file
|
|
transfer.sendFile(new File("shakespeare_complete_works.txt"), "You won't believe this!");
|
|
```
|
|
|
|
Receiving a file from another user
|
|
----------------------------------
|
|
|
|
**Description**
|
|
|
|
The user may wish to receive files from another user. The process of receiving
|
|
a file is event driven, new file transfer requests are received from other
|
|
users via a listener registered with the file transfer manager.
|
|
|
|
**Usage**
|
|
|
|
In order to receive a file you must first construct an instance of the
|
|
**_FileTransferManager_** class. This class has one static factory method with one
|
|
parameter which is your XMPPConnection. In order to instantiate the manager
|
|
you should call _FileTransferManager.getInstanceFor(connection)_.
|
|
|
|
Once you have your **_FileTransferManager_** you will need to register a
|
|
listener with it. The FileTransferListener interface has one method,
|
|
**fileTransferRequest(request)**. When a request is received through this
|
|
method, you can either accept or reject the request. To help you make your
|
|
decision there are several methods in the **_FileTransferRequest_** class that
|
|
return information about the transfer request.
|
|
|
|
To accept the file transfer, call the **accept()** method. This method will create an
|
|
**_IncomingFileTransfer_**. After you have the file transfer you may start to
|
|
transfer the file by calling the **recieveFile(file)** method. The file
|
|
provided to this method will be where the data from the file transfer is saved.
|
|
|
|
Finally, to reject the file transfer the only method you need to call is
|
|
**reject()** on the **_FileTransferRequest_**.
|
|
|
|
For information on monitoring the progress of a file transfer see the
|
|
monitoring progress section of this document.
|
|
|
|
Other means to receive a file are also provided as part of the
|
|
**_IncomingFileTransfer_**. Please consult the Javadoc for more information.
|
|
|
|
**Examples**
|
|
|
|
In this example we can see how to approve or reject a file transfer request:
|
|
|
|
```
|
|
// Create the file transfer manager
|
|
final FileTransferManager manager = FileTransferManager.getInstanceFor(connection);
|
|
// Create the listener
|
|
manager.addFileTransferListener(new FileTransferListener() {
|
|
public void fileTransferRequest(FileTransferRequest request) {
|
|
// Check to see if the request should be accepted
|
|
if (shouldAccept(request)) {
|
|
// Accept it
|
|
IncomingFileTransfer transfer = request.accept();
|
|
transfer.recieveFile(new File("shakespeare_complete_works.txt"));
|
|
} else {
|
|
// Reject it
|
|
request.reject();
|
|
}
|
|
}
|
|
});
|
|
```
|
|
|
|
Monitoring the progress of a file transfer
|
|
------------------------------------------
|
|
|
|
**Description**
|
|
|
|
While a file transfer is in progress you may wish to monitor the progress of a
|
|
file transfer.
|
|
|
|
**Usage**
|
|
|
|
Both the **_IncomingFileTransfer_** and the **_OutgoingFileTransfer_** extend
|
|
the **_FileTransfer_** class which provides several methods to monitor how a
|
|
file transfer is progressing:
|
|
|
|
* **getStatus()** - The file transfer can be in several states, negotiating, rejected, cancelled, in progress, error, and complete. This method will return which state the file transfer is currently in.
|
|
* **getProgress()** - If the status of the file transfer is in progress this method will return a number between 0 and 1, 0 being the transfer has not yet started and 1 being the transfer is complete. It may also return a -1 if the transfer is not in progress.
|
|
* **isDone()** - Similar to getProgress() except it returns a _boolean_. If the state is rejected, canceled, error, or complete then true will be returned and false otherwise.
|
|
* **getError()** - If there is an error during the file transfer this method will return the type of error that occured.
|
|
|
|
**Examples**
|
|
|
|
In this example we can see how to monitor a file transfer:
|
|
|
|
```
|
|
while(!transfer.isDone()) {
|
|
if (transfer.getStatus().equals(Status.error)) {
|
|
System.out.println("ERROR!!! " + transfer.getError());
|
|
} else {
|
|
System.out.println(transfer.getStatus());
|
|
System.out.println(transfer.getProgress());
|
|
}
|
|
sleep(1000);
|
|
}
|
|
```
|