Network programming in Java

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]

Network programming in Java

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Network programming in Java