Network Socket Programming with JAVA
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This document discusses network programming concepts in Java, including client-server architecture, internet protocols, IP addresses and ports, sockets, and implementing UDP applications. It provides code examples of sending and receiving data using UDP datagram packets and sockets in Java. Specifically, it shows how to create a client-server application where the server can broadcast messages to clients in a multicast group using UDP multicast sockets.
![Client/Server Architecture
Q7M1 – SC Dudy Fathan Ali S.Kom
Bob
[Client]
Pizza Store
[Server]
The client places a
request or order
to the server.
The server processes
the request of the
client
The communication
between the client
and the server is
usually through a
network.
The Client/Server model is an application development architecture designed to separate
the presentation of data from its internal processing and storage.](https://image.slidesharecdn.com/part1-networksocketprogramming-170223063218/85/Network-Socket-Programming-with-JAVA-5-320.jpg)
![Java Classes for Network Programming
Q7M1 – SC Dudy Fathan Ali S.Kom
The InetAddress Class:
o Represents an IP address.
o Contains the following static methods to initialize InetAddress
objects:
o public static InetAddress getLocalHost()
o public static InetAddress getByName(String host)
o public static InetAddress[] getAllByName(String host)](https://image.slidesharecdn.com/part1-networksocketprogramming-170223063218/85/Network-Socket-Programming-with-JAVA-18-320.jpg)
![Java Classes for Network Programming
Q7M1 – SC Dudy Fathan Ali S.Kom
The non-static methods of the InetAddress class are:
o public boolean equals(Object obj)
o public byte[] getAddress()
o public String getHostAddress()
o public String toString()](https://image.slidesharecdn.com/part1-networksocketprogramming-170223063218/85/Network-Socket-Programming-with-JAVA-19-320.jpg)
![Creating Application Using UDP
Q7M1 – SC Dudy Fathan Ali S.Kom
o UDP is a fast, connectionless, and unreliable protocol.
o UDP sockets use UDP protocol for communication over a network.
o The java.net package provides the following two classes that
enable you to implement UDP sockets in a Java application:
o DatagramPacket class
o DatagramSocket class
o The DatagramPacket object is a data container that consists of
datagram packets that are sent or received over the network.
o The constructor used to initialize DatagramPacket objects are:
o public DatagramPacket( byte[] buffer, int
buffer_length)
o public DatagramPacket( byte[] buffer, int
buffer_length, InetAddress address, int port)](https://image.slidesharecdn.com/part1-networksocketprogramming-170223063218/85/Network-Socket-Programming-with-JAVA-23-320.jpg)
![Creating Application Using UDP
Q7M1 – SC Dudy Fathan Ali S.Kom
Code Example [DataSender]:](https://image.slidesharecdn.com/part1-networksocketprogramming-170223063218/85/Network-Socket-Programming-with-JAVA-25-320.jpg)
![Creating Application Using UDP
Q7M1 – SC Dudy Fathan Ali S.Kom
Code Example [DataReceiver]:](https://image.slidesharecdn.com/part1-networksocketprogramming-170223063218/85/Network-Socket-Programming-with-JAVA-26-320.jpg)
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Network Socket Programming with JAVA
- 1. Q7M1 – SC Dudy Fathan Ali S.Kom Network Socket Programming Q7M1 Dudy Fathan Ali, S.Kom (DFA) 2017 CEP - CCIT Fakultas Teknik Universitas Indonesia
- 2. Consider this scenario.. Q7M1 – SC Dudy Fathan Ali S.Kom Hello, I want a pizza. Guys, bob wants a pizza! Bob Pizza Store
- 3. Consider this scenario.. Q7M1 – SC Dudy Fathan Ali S.Kom Pizza Store Standard Operational Procedure
- 4. Hmm.. Q7M1 – SC Dudy Fathan Ali S.Kom
- 5. Client/Server Architecture Q7M1 – SC Dudy Fathan Ali S.Kom Bob [Client] Pizza Store [Server] The client places a request or order to the server. The server processes the request of the client The communication between the client and the server is usually through a network. The Client/Server model is an application development architecture designed to separate the presentation of data from its internal processing and storage.
- 6. Client/Server Architecture Q7M1 – SC Dudy Fathan Ali S.Kom Pizza Store The processing that is done by the server is hidden from the client.
- 7. Client/Server Architecture Q7M1 – SC Dudy Fathan Ali S.Kom Steve Bob John One server can service multiple clients.
- 8. Client/Server Architecture Q7M1 – SC Dudy Fathan Ali S.Kom The server and the client are not necessarily hardware components. They can be programs working on the same machine or on different machines.
- 9. Internet Protocol Q7M1 – SC Dudy Fathan Ali S.Kom The Internet Protocol (IP) is the principal communications protocol in the Internet protocol suite for relaying datagrams across network boundaries. Its routing function enables internetworking, and essentially establishes the Internet. -- Source: wikipedia.org -- Source: google.com
- 10. Internet Protocol Q7M1 – SC Dudy Fathan Ali S.Kom implicit rules in conversation?
- 11. Internet Protocol Q7M1 – SC Dudy Fathan Ali S.Kom o Data is sent from one machine to another in form of packets. o Rules govern packaging of data into packets, speed of transmission, and reassembling of data into its original form. o These rules are called network protocols. Communication rules between computers
- 12. IP Address & Port Q7M1 – SC Dudy Fathan Ali S.Kom
- 13. IP Address & Port Q7M1 – SC Dudy Fathan Ali S.Kom The TCP protocol requires two data items: the IP address and the port number. 172.17.8.192 : 80 IP Address Port o Well-known ports o Registered ports o Dynamic/Private ports
- 14. IP Address & Port Q7M1 – SC Dudy Fathan Ali S.Kom IP Addresses of Popular Websites
- 15. Sockets Q7M1 – SC Dudy Fathan Ali S.Kom Sockets are used to handle the communication links between applications over the network. Further communication between the client and the server is through the socket. -- Source: NIIT Courseware Q7M1
- 16. Java Classes for Network Programming Q7M1 – SC Dudy Fathan Ali S.Kom o The java.net package of the Java programming language contains classes and interfaces that provide support for networking. o Networking classes contain methods to perform tasks, such as opening and closing a connection to remote machine, sending and receiving data packets and accessing resources on the Web.
- 17. Java Classes for Network Programming Q7M1 – SC Dudy Fathan Ali S.Kom Classes of the java.net Package: o DatagramPacket o Represents a datagram packet. o DatagramSocket o Represents a datagram socket object that can send and receive datagram packets. o MulticastSocket o Creates a multicast datagram socket object that is used to send and receive datagram packets to groups. o InetAddress o Represents an IP address. o ServerSocket o Represents a TCP/IP server socket object that receives connection requests from the clients.
- 18. Java Classes for Network Programming Q7M1 – SC Dudy Fathan Ali S.Kom The InetAddress Class: o Represents an IP address. o Contains the following static methods to initialize InetAddress objects: o public static InetAddress getLocalHost() o public static InetAddress getByName(String host) o public static InetAddress[] getAllByName(String host)
- 19. Java Classes for Network Programming Q7M1 – SC Dudy Fathan Ali S.Kom The non-static methods of the InetAddress class are: o public boolean equals(Object obj) o public byte[] getAddress() o public String getHostAddress() o public String toString()
- 20. Java Classes for Network Programming Q7M1 – SC Dudy Fathan Ali S.Kom Code Example: Result: Returns an InetAddress object that contains the IP address of the local computer. Returns the IP address of the InetAddress object as a String.
- 21. TCP vs UDP Q7M1 – SC Dudy Fathan Ali S.Kom
- 22. TCP vs UDP Q7M1 – SC Dudy Fathan Ali S.Kom
- 23. Creating Application Using UDP Q7M1 – SC Dudy Fathan Ali S.Kom o UDP is a fast, connectionless, and unreliable protocol. o UDP sockets use UDP protocol for communication over a network. o The java.net package provides the following two classes that enable you to implement UDP sockets in a Java application: o DatagramPacket class o DatagramSocket class o The DatagramPacket object is a data container that consists of datagram packets that are sent or received over the network. o The constructor used to initialize DatagramPacket objects are: o public DatagramPacket( byte[] buffer, int buffer_length) o public DatagramPacket( byte[] buffer, int buffer_length, InetAddress address, int port)
- 24. Creating Application Using UDP Q7M1 – SC Dudy Fathan Ali S.Kom o DatagramSocket class encapsulates the functionality to handle DatagramPacket objects. o The constructors used to initialize DatagramSocket object are: o public DatagramSocket() o public DatagramSocket(int port) o public DatagramSocket(int port, InetAddress address)
- 25. Creating Application Using UDP Q7M1 – SC Dudy Fathan Ali S.Kom Code Example [DataSender]:
- 26. Creating Application Using UDP Q7M1 – SC Dudy Fathan Ali S.Kom Code Example [DataReceiver]:
- 27. Demonstration-Implementing UDP Q7M1 – SC Dudy Fathan Ali S.Kom Create a Client/Server application where the server can broadcast messages to all the clients of 233.0.0.1 group.
- 28. Q7M1 – SC Dudy Fathan Ali S.Kom Thank You! Dudy Fathan Ali, S.Kom [email protected]