Socket Programming using Java
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1) Sockets provide an interface between an application process and the transport layer to allow communication between processes locally or remotely. The main types of sockets are TCP, UDP, and raw sockets. 2) Socket programming in Java uses I/O streams, readers/writers, and socket classes like ServerSocket and Socket to create TCP and UDP sockets for communication. TCP sockets use streams for reliable connection-oriented communication while UDP uses datagram packets for unreliable connectionless communication. 3) The document discusses how two friends could use TCP or UDP sockets in Java to chat between their computers after their messaging apps were uninstalled, providing examples of one-way and two-way communication implementations.
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Create UDP Socket
[Connection less]
socket()
bind()
recvfrom(
)
sendto()
socket()
recvfrom(
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sendto()
ClientServer
close() close()](https://image.slidesharecdn.com/session-2-150702160151-lva1-app6892/85/Socket-Programming-using-Java-19-320.jpg)
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• New Mexico: 7 - This is 10.6% of all NM cases.
• Kansas: 1 - This is 2.7% of all KS cases.
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All the materials around us are made up of elements. These elements can be broadly divided into two major groups:
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Non-Metals
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Physical Properties
1. Appearance
Metals: Shiny (lustrous). Example: gold, silver, copper.
Non-metals: Dull appearance (except iodine, which is shiny).
2. Hardness
Metals: Generally hard. Example: iron.
Non-metals: Usually soft (except diamond, a form of carbon, which is very hard).
3. State
Metals: Mostly solids at room temperature (except mercury, which is a liquid).
Non-metals: Can be solids, liquids, or gases. Example: oxygen (gas), bromine (liquid), sulphur (solid).
4. Malleability
Metals: Can be hammered into thin sheets (malleable).
Non-metals: Not malleable. They break when hammered (brittle).
5. Ductility
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Non-metals: Not ductile.
6. Conductivity
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Non-metals: Poor conductors (except graphite, which is a good conductor).
7. Sonorous Nature
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Non-metals: Do not produce sound.
Chemical Properties
1. Reaction with Oxygen
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Non-metals react with oxygen to form non-metallic oxides.
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2. Reaction with Water
Metals:
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Some react slowly (e.g., iron).
Some do not react at all (e.g., gold, silver).
Non-metals: Generally do not react with water.
3. Reaction with Acids
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Non-metals: Do not react with acids.
4. Reaction with Bases
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Displacement Reaction
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Uses of Metals
Iron: Making machines, tools, and buildings.
Aluminum: Used in aircraft, utensils.
Copper: Electrical wires.
Gold and Silver: Jewelry.
Zinc: Coating iron to prevent rusting (galvanization).
Uses of Non-Metals
Oxygen: Breathing.
Nitrogen: Fertilizers.
Chlorine: Water purification.
Carbon: Fuel (coal), steel-making (coke).
Iodine: Medicines.
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- 4. OpenLab 4 TCP/IP ModelEncapsulation Decapsulation
- 6. OpenLab 6 Sockets ● Defination - An interface between an application process and transport layer – The application process can send/receive messages to/from another application process (local or remote)via a socket ● Types of Sockets – TCP/Stream Socket – UDP/Datagram Socket – Raw Socket ● No Sockets – No communication
- 7. OpenLab 7 Socket Programming using JAVA ● I/O Stream ● Reader/Writer ● Create Socket (Class) – TCP Socket ● Server ServerSocket ● Client Socket – UDP Socket ● DatagramSocket
- 8. OpenLab 8 I/O Stream *https://docs.oracle.com/javase/tutorial/essential/io/streams.html OutputStream InputStream Write Read - Input Source - Output Destination A stream can represent many different kinds of sources & destinations - - Files - Devices - Programs - Memory arrays
- 9. OpenLab 9 Classification of Streams ● Byte Stream – Data in the form of individual bytes ● Text Strem – Data as character of each 2 bytes
- 10. OpenLab 10 Byte Strem ● Byte Stream – Data in the form of individual bytes ● InputStrem – DataInputStream – FileInputStream – BufferedInputStream – . . . ● OutputStream – DataOutputStream – FileOutputStream – BufferedOutputStream – . . .
- 11. OpenLab 11 Text Stream ● Text Stream – Data as character of each 2 bytes ● Reader – FileReader – BufferedReader ● Writer – FileWriter – BufferedWriter
- 12. OpenLab 12 Steps to create Socket(Server/Client) ● TCP Server Socket – Step-1 Create ServerSocket Object – Step-2 Wait for the client request – Step-3 Create I/O streams for communication to the client. – Step-4 Perform communication with client – Step-5 Close Socket ● TCP Client Socket – Step-1 Create Socket Object – Step-2 Create I/O streams for communication with the server – Step-3 Perform I/O or communication with the server – Step-4 Close Socket
- 13. OpenLab 13 Create TCP Socket (Connection Oriented) socket() connect() bind() accept() send() recv() listen() socket() send() recv() Server Client close() close()
- 14. OpenLab 14 Working of TCP Socket
- 15. OpenLab 15 Scenario 2 ● Two BEST friends , they want to chat to each using their computer and their fathers uninstalled messanger from their computers Ganesh Mohan
- 16. OpenLab 16 Case-1 ● They decided to create a STREAM/TCP Socket ● One way Communication I/O Stream Client Socket MOHAN Server Socket GANESH `
- 17. OpenLab 17 Case-2 ● They decided to create a STREAM/TCP Socket ● Two way Communication I/O Stream Client Socket MOHAN Server Socket GANESH `
- 18. OpenLab 18 Steps to Create UDP Socket ● UDP Server/Client – Step-1 Create DatagramSocket object – Step-2 Create buffer for tmp storage – Step-3 Store/Reterive data in/from buffer – Step-4 Create DatagramPacket – Step-5 send/receive DatagramPacket
- 19. OpenLab 19 Create UDP Socket [Connection less] socket() bind() recvfrom( ) sendto() socket() recvfrom( ) sendto() ClientServer close() close()
- 20. OpenLab 20 Case-1 ● They decided to create a DATAGRAM/UDP Socket ● One way Communication Client Socket MOHAN Server Socket GANESH Datagram Packet
- 21. OpenLab 21 Case-2 ● They decided to create a DATAGRAM/UDP Socket ● Two way Communication Client Socket MOHAN Server Socket GANESH Datagram Packet Datagram Packet
- 22. OpenLab 22 To be continued...