Description: preparation of this procedure, which is used in the transport layer UDP, regardless of the server and client, used such entities to realize the huge information transmission. Java.net.DatagramPacket use category and java.net.Data grameSocket Class of molars and data transmission. And using multicast form of the transfer of data information. Use three simple protocol data unit (PDU), the PDU JOIN, LEAVE PDU. MESSAGE PDU. , Said the first link multicast data reported that users leave multicast data reported, End user input information on the multicast data reported.
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