Thuyết trình chủ đề game oẳn tù tì

Source : Advanced Network Programming Principles and Tecniques Socket sock = servSock.accept; /*sock is a socket object.*/... out.println"Waiting..."; String msg = in.readLine; Close; i

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Oẳn Tù Tì Game Report

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6.Demo 2.Model

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1 Overview Game

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Client 2

Request

Response

2.Model

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 Clients need not be aware of physical location of server

• Mix and match of platforms

 Client and server may have heterogeneous platforms

• Scalability

 Provides scope for scalability and ease of maintenance

2.Model

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- Socket:

Sockets are network communication link end-points between two

applications (i.e., server and client).

Source : Advanced Network Programming Principles and Tecniques

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3 Socket Client-Server

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- - There are two type of Sockets:

- - Transport layer socket: TCP and UDP

- - Application layer Socket: HTTP, SMTP

- Socket:

Sockets are network communication link end-points between two

applications (i.e., server and client).

Image from: http://bioinfo2.ugr.es/OReillyReferenceLibrary/java/fclass/ch15_js.htm

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Figure The java.net package

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 TCP Socket :Server Side

IP address, port number, and communication protocol (TCP).

Socket sock = servSock.accept();

/*sock is a socket object.*/

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 TCP Socket :Server Side

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BufferedReader in = new BufferedReader(

new InputStreamReader(sock.getInputStream()));

PrintWriter out = new PrintWriter(sock.getOutputStream(), true);

Send and receive data.

out.println("Waiting ");

String msg = in.readLine();

Close;

important parameters:

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 TCP Socket: Client side

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Set input and output streams.

BufferedReader in = new BufferedReader

(new InputStreamReader(sock.getInputStream()));

PrintWriter out =new PrintWriter(sock.getOutputStream(), true);

Send and receive data.

out.println("");

String msgIn = in.readLine();

Close the connection

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The packets are guaranteed to arrive (if lost, retransmission occurs) and are received in order at the destination

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IP address, port number, and communication protocol (UDP).

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 UDP Socket: Server side

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Create a datagram socket object.

DatagramSocket dgramSocket = new DatagramSocket(portno);

/*1024 <= portno <= 65535*/

Create a buffer to store the incoming datagrams:

byte[] buffer = new byte[256];

/*-128 <= byte value <= 127*/

Create a datagram packet object for incoming datagrams:

DatagramPacket inPkt = new DatagramPacket(buffer, buffer.length);

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Accept an incoming datagram:

dgramSocket.receive(inPkt);

Retrieve the data from the buffer:

String msgIn = new String(inPkt.getData(), 0, inPkt.getLength());

Get sender’s address and port number from the datagram:

InetAddress cliAddress = inPkt.getAddress();

int cliPort = inPkt.getPort();

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Close the datagram socket:

dgramSocket.close();

msgOut = ("Message out ");

DatagramPacket outPkt = new DatagramPacket(msgOut.getBytes(),msgOut.length(), cliAddress,cliPort);

Send the response datagram:

dgramSocket.send(outPkt);

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 UDP Socket: Client side

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IP address, port number, and communication protocol (TCP or UDP).

Create a datagram socket object:

DatagramSocket dgramSocket = new DatagramSocket();

BufferedReader userEntry = new BufferedReader(new InputStreamReader(System.in));

String msg = userEntry.readLine();

DatagramPacket outPkt = new DatagramPacket(msg.getBytes(),msg.length(), host, portno);

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 UDP Socket: Client side

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Send the response datagram:

dgramSocket.send(outPkt);

Accept an incoming datagram:

dgramSocket.receive(inPkt);

Retrieve the data from the buffer:

String msgIn = new String(inPkt.getData(), 0, inPkt.getLength());

Close the datagram socket:

dgramSocket.close();

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 Multicast Introduction

https://kb.meraki.com/knowledge_base/multicast-support

23 Multi-casting involves one-to-many communications between a sender and a set of receivers

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-These receivers must belong to a multicast group

- All class D IP addresses are multicast addresses and range from

224.0.0.0 to 235.255.255.255

 Multicast Introduction

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 Multicast introduction

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Layer – Protocol diagram

Advanced Network Programming - Principles and Techniques – March 2013, P.32

304.Extension

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Common types of protocols

 Transmission Control Protocol (TCP)

 User Datagram Protocol (UDP)

 Internet Control Message Protocol (ICMP)

 Hypertext Transfer Protocol (HTTP - 80)

 Post Office Protocol (POP – 109,110)

 File Transfer Protocol (FTP – 20,21)

 Internet Message Access Protocol (IMAP)

 Simple Mail Transport (SMTP – 25)

 Secure Shell (SSH – 22)

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Common types of protocols (Cont)

 Other instances of high level interaction

protocols are:

• General Inter-ORB Protocol (IIOP)

• Java remote method invocation (RMI)

• Distributed Component Object Model (DCOM)

• SOAP

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User Datagram Protocol

http://www.kashif-ali.com/2011/06/tcp-vs-udp/ (Date: 30 Aug 2014)

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User Datagram Protocol (Cont)

www.opensourceforu.com/2011/11/socket-api-part-4-datagrams/ (Date: 30 Aug 2014)

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User Datagram Protocol (Cont) import java.io.*;

import java.net.*;

class UDPServer

{

public static void main(String args[]) throws Exception

{

DatagramSocket serverSocket = new DatagramSocket(9876);

byte[] receiveData = new byte[1024];

byte[] sendData = new byte[1024];

while(true)

{

DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);

serverSocket.receive(receivePacket);

String sentence = new String( receivePacket.getData());

System.out.println("RECEIVED: " + sentence);

InetAddress IPAddress = receivePacket.getAddress();

int port = receivePacket.getPort();

String capitalizedSentence = sentence.toUpperCase();

sendData = capitalizedSentence.getBytes();

DatagramPacket sendPacket =

new DatagramPacket(sendData, sendData.length, IPAddress, port);

serverSocket.send(sendPacket);

} }

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User Datagram Protocol (Cont)import java.io.*;

new BufferedReader(new InputStreamReader(System.in));

DatagramSocket clientSocket = new DatagramSocket();

InetAddress IPAddress = InetAddress.getByName("localhost");

byte[] sendData = new byte[1024];

byte[] receiveData = new byte[1024];

String sentence = inFromUser.readLine();

String modifiedSentence = new String(receivePacket.getData());

System.out.println("FROM SERVER:" + modifiedSentence);

clientSocket.close();

}

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File Transfer Protocol [1]

 FTP was developed in 1985 and is still widely used today

 The protocol has been first defined in RFC 959, but then

several extensions have been proposed to enhance flexibility and security (RFC 1579, RFC 2228)

 FTP works on top of TCP and in general uses port 21

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 Access control commands include:

• USER—indicates the user;

• PASS—indicates the password;

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 Transfer parameter commands include:

• PORT—publish local data port;

• PASV—server passive (listen);

• TYPE—indicate data representation (A-ASCII, EBCDIC, I-Image, LLocal);

E-• MODE—indicate transfer mode (S-Stream, B-Block, Compressed);

C-• STRU—establish file structure (F-FILE, R-RECORD, PAGE).

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 Service commands include:

• RETR (REVC) —retrieve file;

• STOR—send and store the file remotely;

• APPE—send file and append;

• DELE—delete the file;

• MKD—make a new directory;

• RMD—remove a directory;

• PWD—print working directory;

• LIST (ls)—list files.

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5 Game Actvity

Server

Get ip server

Client

socket = new DatagramSocket( 4445 ) socket = new DatagramSocket( 4446 )

packet = new DatagramPacket( data ,

255.255.255.255 , 4445 ) socket.send(packet) socket.receive(packet)

packet = new DatagramPacket( data ,

ipClient , portClient )

socket.send(packet)

socket.receive(packet)

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Connect server

socketSV = new ServerSocket( 4447 )

socket = new Socket( addrServer , 4447 ) socket = socketSV.accept()

send request ‘ submit name ’

read request send name read request

validation, send list players

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send ‘ Begin Game ’

read request read request

call frame ‘ Ready ’ call frame ‘Ready’

5 Game Actvity

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read request

determine winner send result

5 Game Actvity

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1 Advanced Network Programming Principles and Techniques book

2 Java Socket Programming Examples,

http://cs.lmu.edu/~ray/notes/javanetexamples/, 01/08/2014

3 Broadcasting to Multiple Recipients,

http://docs.oracle.com/javase/tutorial/networking/datagrams/broadcasting.html, 08/08/2014

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