Java: Socket Programming Simplified

Name: Java: Socket Programming Simplified
Rating: 4.6 (635 reviews)

Build the foundations for server side programming, a MUST learn for server side application developers/aspirants.

Created bySagar Uppuluri

Last updated 6/2021

English

What you'll learn

Get deep insights about single threaded and multi-threaded client/server communication using TCP/IP
Understand UDP, HTTP and understand working of HTTPServer using a Mock Server.
Build simple peer-to-peer chat and group chat apps.

Course content

6 sections • 16 lectures • 1h 47m total length

Introduction1:04
Understand message transfer between applications3:48
Port number uniquely identifies an application running under one protocol. When a message is sent from an application, several headers gets added and they help in passing relevant information to be processed by the same layer on the other end.

Basic Client Server Example11:44
java.net package provides the API for TCP and UDP communication. ServerSocket is a class which opens a socket at the server end which enables server to listen to the client request. The accept() method of the ServerSocket class waits for client and once connected returns a Socket object which is used for communication. Communication can happen through the input and output streams of the Socket class.
Single Threaded Client Server11:09
When a server is single threaded it normally accepts one client at a time. The downside of it is that server is also blocked when the client is blocked.
Downside of single threaded client server3:46
When a client is serviced sequentially, if a client is blocked then the server is also blocked.
Multi-threaded Client Server6:43
Assign each client socket to a separate thread so that the client is serviced in parallel and also server is not blocked even if one of the client is blocked.
Having said that instead of creating separate thread for each client we can create a pool of threads and assign the available thread to the client.
User Datagram Protocol8:11
TCP (Transmission control protocol) is a connection oriented protocol and hence exchange of information is possible only after establishing the connection. Where as UDP (User datagram protocol) is a connection less protocol and hence there is no need to establish a connection before exchanging information. Here you will send/receive DatagramPacket through DatagramSocket. Once sent that it the end of interaction. We can further enhance this protocol as per our need to acknowledge the packet or make it a to and fro interaction using the address available through the packet.
Problem Set0:17

HTTP interaction explained12:20
HTTP (Hyper Text Transfer Protocol) defines the structure of request and response on top of TCP/IP connection that enables information exchange between a browser and a server. Later it is also adopted to define REST API. It is a stateless protocol i.e. once server responds to the client it forgets about the client. HTTP request and response includes header, break line and body part. Header includes necessary support information about the application or response (in case of response) and the body part includes the data associated with either request or response.
Sample Multi-threaded HttpServer3:30
A simple multi-threaded HttpServer with 5 threads for servicing the client request.

Requirements

You should possess the basic knowledge in Object oriented programming in Java.
Basic knowledge in Java multi-threading is good to have.

Description

Socket programming is an essential part of the language that enables you to understand how applications communicate over the network. This helps in enabling you to understand how client server communication works and also gives you more insights into how server applications are built.

It is important for each and every application developer (including Java developers) to have an understanding of how socket communication works. Hence this course is an absolute necessity.

The primary focus points of this course include

How TCP/IP communication works
How UDP/IP communication works
Basic client/server coding using multi-threaded client/server.
Get working knowledge of HTTP communication using Mock HTTPServer.
Build a Peer-to-Peer chat app using TCP/IP
Build a Group Chat app using UDP/IP.

Once you are familiar with the above topics you will be able to confidently deal with the current client/server applications.

Who this course is for:

Anyone who is familiar with Java programming and looking to get started with server side coding.
Useful even for the one who is looking to learn Socket Programming in some other language. This course will certainly give them the much needed introduction.

Java: Socket Programming Simplified

What you'll learn

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Course content

Introduction2 lectures • 5min

TCP and UDP6 lectures • 42min

HTTP2 lectures • 16min

Examples Apps4 lectures • 45min

Source Code1 lecture • 1min

What's next?1 lecture • 1min

Requirements

Description

Who this course is for: