About

• TCP is relatively simple and reliable protocol that enables a client to make a connection to a server and the two systems to communicate. In TCP, each entity knows that its communication payloads have been received.

• UDP is a connectionless protocol and is good for scenarios where you do not necessarily need every packet to arrive at its destination, such as media streaming.

• This project demostrates client-server examples using Java I/O framework.

• The following code opens a connection to a server:
  

    	Socket socket = new Socket( server, port ); 
  

• Used methods to obtain input and output streams:
  

    	InputStream in = socket.getInputStream(); <BR/>
    	OutputStream out = socket.getOutputStream();
  

Steps

• Create a ServerSocket, specifying a port to listen on.
• Invoke the ServerSocket's accept() method to listen on the configured port for a client connection.
• When a client connects to the server, the accept() method returns a Socket through which the server can communicate with the client. This is the same Socket class that we used for our client, so the process is the same: obtain an InputStream to read from the client and an OutputStream write to the client.
• If you server needs to be scalable, you will want to pass the Socket to another thread to process so that your server can continue listening for additional connections.
• Call the ServerSocket's accept() method again to listen for another connection.

How to Run

• Download the project
• First run the main method in ServerSocketExample.java
• Then, Run main method in ClientSocket.java

Will observe the output as in ServerSocket Terminal

Start server on port: 80
Listening for a connection

Will observe the output as in Client Terminal

Loading contents of URL: 127.0.0.1
Echo Server 1.0
Echo: GET / HTTP/1.0

Once you will satrt client program, Will observe the output as in ServerSocket Terminal

Received a connection

Flow