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Network programming in Java

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Tushar B Kute
Tushar B Kute

The presentation given at MSBTE sponsored content updating program on 'Advanced Java Programming' for Diploma Engineering teachers of Maharashtra. Venue: Guru Gobind Singh Polytechnic, Nashik Date: 22/12/2010 Session: Java Network Programming

Formation
1  sur  63
Java Network Programming Tushar B. Kute, Department of Information Technology, Sandip Institute of Technology and Research Centre, Nashik.
Agenda ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
“ The Network is Computer” Internet Server PC client Local Area Network PDA
Increased demand for Internet applications ,[object Object],[object Object],[object Object]
Elements of C-S Computing Network Request Result a client, a server, and network Client Server Client machine Server machine
Networking Basics ,[object Object]
DNS - Domain name system ,[object Object],[object Object],[object Object]
Understanding Ports ,[object Object],server P o r t Client TCP TCP or UDP port port port port app app app app port# data Data Packet
Understanding Ports ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Sockets ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Socket Communication ,[object Object],server Client Connection request port
Socket Communication ,[object Object],server Client Connection port port port
Transmission Control Protocol ,[object Object],[object Object],[object Object],[object Object]
User Datagram Protocol ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Ports ,[object Object],[object Object]
Ports – Cont. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Networking Classes in the JDK ,[object Object],[object Object],[object Object]
TCP/IP in Java ,[object Object],[object Object],[object Object],[object Object]
InetAddress ,[object Object],[object Object],[object Object]
Factory Methods ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Example: ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Instance Methods ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Sockets and Java Socket Classes ,[object Object],[object Object],[object Object],[object Object],[object Object]
Java Sockets ServerSocket(1234) Socket(“128.250.25.158”, 1234) Output/write stream Input/read stream It can be host_name like “books.google.com” Client Server
Client Sockets ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Constructors ,[object Object],[object Object]
Instance Methods ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Implementing a Client ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Example: Whois server ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Example: Time server ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
ServerSocket ,[object Object],[object Object]
Constructors ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Implementing a Server ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Accepting Connections ,[object Object],[object Object],[object Object],[object Object],[object Object]
Client-Server Interaction via TCP
Examples ,[object Object],[object Object]
URL - Uniform Resource Locator ,[object Object],[object Object],[object Object],[object Object],Protocol Host Name Port Number Path & File Name Reference
Class URL ,[object Object],[object Object],[object Object],[object Object]
Constructors ,[object Object],[object Object],[object Object],[object Object]
Example ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Output ,[object Object],[object Object],[object Object],[object Object],[object Object]
URLConnection ,[object Object],[object Object],[object Object]
Process ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Reading Data from Server ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Example ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],URLConnection Example
Difference between URL and URLConnection ,[object Object],[object Object],[object Object]
Header Information ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Methods ,[object Object],[object Object],[object Object],[object Object],[object Object]
Example ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],catch (MalformedURLException ex) { System.out.println("I can't understand this URL..."); } catch (IOException ex) { System.err.println(ex); } System.out.println( ); } // end main } // end HeaderViewer
Sample Output ,[object Object],[object Object],[object Object],[object Object]
Retrieving Header field ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Datagrams ,[object Object],[object Object]
TCP vs. UDP No. TCP UDP 1 This Connection oriented protocol This is connection-less protocol 2 The TCP connection is byte stream The UDP connection is a message stream 3 It does not support multicasting and broadcasting It supports broadcasting 4 It provides error control and flow control The error control and flow control is not provided 5 TCP supports full duplex transmission UDP does not support full duplex transmission 6 It is reliable service of data transmission This is an unreliable service of data transmission 7 The TCP packet is called as segment The UDP packet is called as user datagram.
UDP in Java ,[object Object],[object Object]
Receiving DatagramPacket ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Sending Datagrams ,[object Object],[object Object]
DatagramSocket ,[object Object],[object Object],[object Object]
Sending and Receiving Packets ,[object Object],[object Object]
Example : ,[object Object],[object Object]
References ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
References ,[object Object],[object Object],[object Object],[object Object],[object Object]
Thank You

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Network programming in Java

  • 1. Java Network Programming Tushar B. Kute, Department of Information Technology, Sandip Institute of Technology and Research Centre, Nashik.
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  • 3. “ The Network is Computer” Internet Server PC client Local Area Network PDA
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  • 5. Elements of C-S Computing Network Request Result a client, a server, and network Client Server Client machine Server machine
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  • 24. Java Sockets ServerSocket(1234) Socket(“128.250.25.158”, 1234) Output/write stream Input/read stream It can be host_name like “books.google.com” Client Server
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  • 54. TCP vs. UDP No. TCP UDP 1 This Connection oriented protocol This is connection-less protocol 2 The TCP connection is byte stream The UDP connection is a message stream 3 It does not support multicasting and broadcasting It supports broadcasting 4 It provides error control and flow control The error control and flow control is not provided 5 TCP supports full duplex transmission UDP does not support full duplex transmission 6 It is reliable service of data transmission This is an unreliable service of data transmission 7 The TCP packet is called as segment The UDP packet is called as user datagram.
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