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UDP client server communication JAVA Project -- 2

UDP client server communication JAVA Project

In this part, you need to design and implement a client-server file transfer program using User

Datagram Protocol (UDP), in the Java programming language.

Review the UDPChat Java program that was used in your lab. Make a new class called Bridge

that contains main() method, receives packets on port 4000 from UDPClient, and sends those

to the UDPServer listening on port 5000. In the opposite direction it can also receive packets

from UDPServer and can send them to the UDPClient. You need to create two

DatagramSockets for that purpose; one has to be bound to port 4000 for receiving packets from client and one for sending packet to server which you may (or may not) use a specific binding port. Review the supporting document for more idea on DatagramSocket and DatagramPacket.

The Bridge class needs only main() method; and when it runs with UDPClient and UDPServer in

one machine, it acts as a bridge between the two applications. Without changing the UDPClient

code, the result of the running all classes should not be affected as compared to Lab result and

still should show the Capitalized sentence. You need to change the binding port in UDPServer

from 4000 to 5000.

Modify the UDPServer and UDPClient such that the server stores the strings received from the

client (via the Bridge) in a file called [login to view URL] until the client aborts the process by sending \q and without requiring to restart client app for every string.

Further modify the UDPClient and UDPServer so that if the client asks for a text file that exist in

the server directory, the server sends the file. The client computer will ask the server to send a

copy of a file to the client. The name of the file is to be sent to the server asking if it has a copy.

If it has, then the transfer starts; if not, the server responds that it does not have the file and

asked for another file name. The file is to be of only ASCII characters (no binary files).

This should work for large text files that needs to be transmitted in multiple UDP packets. The

server must do the segmentation required for large files. The received file must be saved in the

client directory. The server computer will send an "end of file character" to signify the end of file.

When the client detects the end-of-file marker, it will close the file and send back an

acknowledgement character to the server to acknowledge the receipt of the file which server

shows on its screen.

The Bridge should show the number of packets that have been transmitted from server to client

at any given time, and its buffer size should be 128 bytes.

Enhancement

In the enhancement part, you will implement an automatic error detection mechanism. The

Bridge class will randomly drop one packet during transfer of a large file. You need to detect this in the client and send a message to the server about the missing packet.

Beceriler: Java, Yazılım Mimarisi

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( 0 değerlendirme ) Hawthorn, Australia

Proje NO: #21185679

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gsid42

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