File transfer method and apparatus

A file transfer method, wherein the method comprises:

• in a process in which a sending device sends a data packet of a to-be-sent file to a device in a multicast group in a multicast manner, joining, by a second device the multicast group, wherein the multicast group comprises at least one device;
• receiving a first message sent by the sending device to the second device, wherein the first message carries at least a file name and block quantity of the to-be-sent file and a first data packet identifier, the first data packet identifier is used to indicate a data packet to be transferred by the sending device, and the first message is used to notify the second device of information about the data packet to be transferred by the sending device;
• and
• receiving, according to the first message, the data packet that is of the to-be-sent file and is to be transferred by the sending device.

A file transfer apparatus, wherein the apparatus comprises:

• a sending module and a receiving module, wherein
• the sending module is configured to send a ready request message to a multicast group in a multicast manner, wherein the ready request message carries at least a file name and block quantity of a to-be-sent file, and the multicast group comprises at least one device;
• the receiving module is configured to receive a ready message returned by a device in the multicast group;
• the sending module is further configured to:
• when the receiving module receives a first ready message returned by a first device in the multicast group, send a first master receiving device determining message to the first device, wherein the first master receiving device determining message is used to notify the first device that the first device has been selected as a master receiving device, and send a data packet of the to-be-sent file to the multicast group in a multicast manner;
• and
• the sending module is further configured to:
• when a second device newly joins the multicast group, send a first message to the second device, wherein the first message carries at least the file name and block quantity of the to-be-sent file and a first data packet identifier, the first data packet identifier is used to indicate a data packet to be transferred by the sending device, the first message is used to notify the second device of information about the data packet to be transferred by the sending device, so that the second device receives, according to the first message, the data packet that is of the to-be-sent file and is to be transferred by the sending device.

A file transfer apparatus, wherein the apparatus comprises:

• a receiving module and a joining module, wherein
• in a process in which a sending device sends a data packet of a to-be-sent file to a device in a multicast group in a multicast manner, the joining module is configured to join the multicast group, wherein the multicast group comprises at least one device;
• the receiving module is configured to receive a first message sent by the sending device to the apparatus, wherein the first message carries at least a file name and block quantity of the to-be-sent file and a first data packet identifier, the first data packet identifier is used to indicate a data packet to be transferred by the sending device, and the first message is used to notify the apparatus of information about the data packet to be transferred by the sending device;
• and
• the receiving module is further configured to receive, according to the first message, the data packet that is of the to-be-sent file and is to be transferred by the sending device.