Socket programming in Java (PPTX)
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Socket programming in Java allows applications to communicate over the internet. Sockets are endpoints for communication that are identified by an IP address and port number. A socket connection is established between a client and server socket. The server creates a welcoming socket to accept client connection requests, then a separate connection socket to communicate with that client. Data can be sent bidirectionally over the connected sockets as input/output streams. UDP uses datagram sockets without a connection, requiring the explicit destination address on each message.
Socket programming in Java (PPTX)
- 1. Socket programming in javaNarendranThangarajan,@naren_live,II Year, BE, CSE,SSN College of Engg, Chennai.
- 2. What started it all..Internet has emerged as a global ubiquitous media for communicationIt has changed the way we live, learn, enjoy, communicate, interact, engage, etc.To take advantage of this, businesses are ceaselessly trying to offer their services through the internet.So a huge demand for software developers good in creating internet-enabled applications.
- 3. Client Server ApplicationsThe Web Service is provided by the server and the clients use these servicesClientRequestServerNetworkResultClient machineServer machineA client, A server, and networkThis is where sockets come in !!
- 4. SocketsIntroduced in BSD 4.1 UNIX 1981.Sockets are the endpoints of any communication over the internet.Sockets are identified by socket addresses.Socket Address = IP Address + Port Number
- 5. Why IP Address + Port number? IP Address is of the form 10.0.0.1
- 6. Port Number can be anything from 0 to 65,535.Destination Socket = 10.0.0.2 : 80IP Address – Choose network20.0.0.030.0.0.010.0.0.040.0.0.0
- 7. IP Address -> MAC Address – Locate the specific systemDestination Socket = 10.0.0.2 : 8010.0.0.110.0.0.2
- 8. Port Number – Process specificPort 10000Port 11000Port 120000
- 9. Understanding PortsGmailYMAVG UpdateOutLookExpressPort 1Port 2Port 3Port 4Transport LayerPacketPort numdataNetwork layer
- 10. Thus virtually, sockets are a connection between the two processes in different systems.Eg : Let the socket pairs be10.0.0.1 : 80 and 20.0.0.1 : 2000192.168.21.10 : 3000 and 192.168.100.1 : 6000
- 11. Networking Basics – the larger pictureApplications Layer
- 12. Standard apps
- 13. HTTP
- 14. FTP
- 15. Telnet
- 16. User apps
- 17. Transport Layer
- 18. TCP
- 19. UDP
- 20. Network Layer
- 21. IP
- 22. Link Layer
- 23. Device driversTCP STACKApplication(http,ftp,telnet,…)Transport(TCP, UDP,..)Network(IP,..)Link(device driver,..)
- 24. Network Basics - Where are these sockets?Applications Layer
- 25. Standard apps
- 26. HTTP
- 27. FTP
- 28. Telnet
- 29. User apps
- 31. SOCKETS
- 32. Transport Layer
- 33. TCP
- 34. UDP
- 35. Network Layer
- 36. IP
- 37. Link Layer
- 38. Device driversTCP STACKApplication(http,ftp,telnet,…)SocketsTransport(TCP, UDP,..)Network(IP,..)Link(device driver,..)
- 39. Now into Socket programming..
- 40. Socket Programming with TCPServer starts first..Server Process must be running firstServer must have created a socket which welcomes client’s connection. (Welcoming socket)Client contacts server by..Creating Client local TCP socketSpecify IP Address and port number of server process.When Client socket is created, the connection is established.When connection is established, server creates a new socket (Connection Socket) to communicate with that client and the Welcoming socket is once again waiting for connections for other clients.
- 41. create socket,connect to hostid, port=xcreate socket,port=x, forincoming request:clientSocket = Socket()welcomeSocket = ServerSocket()wait for incomingconnection requestconnectionSocket =welcomeSocket.accept()send request usingclientSocketread request fromconnectionSocketwrite reply toconnectionSocketread reply fromconnectionSocketcloseconnectionSocketcloseclientSocketClient/Server Socket Interaction in TCPServerClientTCP connection setup
- 42. Step 1 :Step 2 :ServerportServerConnection requestportClientportportClientConnection
- 43. Types of Sockets in TCPServerSocket – the socket used by serversSocket – Socket used by clientsCreate a ServerSocket in the server and make it to wait for connections from Sockets from other clients
- 44. The concept of StreamsClient output streamServer input streamServer socketClient socketClient input streamServer output stream
- 45. Socket Programming with UDPNo Connection between client and server.No handshakingThe sender has to explicitly mention the IP address and the port of the destination.The server should extract the IP Address of the datagram everytime.Uses DatagramSocket.
- 46. Clientcreate socket,port=x, forincoming request:serverSocket = DatagramSocket()create socket,clientSocket = DatagramSocket()Create, address (hostid, port=x),send datagram request using clientSocketread request fromserverSocketwrite reply toserverSocketspecifying clienthost address,port numberread reply fromclientSocketcloseclientSocketClient/server socket interaction: UDPServer
- 47. Coding time..
- 48. ConclusionSocket Programming is very easy in Java.Usually each and every socket is handled by a separate thread in real-time client/server environments.
- 49. Queries