Tutorial Synchronous Socket Programming using JAVA (For Server)

When you have setup code for client application, after a connection is established, a server application uses the same kind of Socket object for its side of the communications. However, to accept a connection from a client, it must first create a ServerSocket, bound to the correct port. Let's recreate the previous conversation from the server's point of view:

Tutorial Synchronous Socket Programming using JAVA (For Client)

A client application opens a connection to a server by constructing a Socket that specifies the hostname and port number of the desired server:

try {
Socket sock = new Socket("wupost.wustl.edu", 25);
} catch ( UnknownHostException e ) {
System.out.println("Can't find host.");
} catch ( IOException e ) {
System.out.println("Error connecting to host.");
}

Tutorial Synchronous Socket Programming using .NET (For Server)

The following example program creates a server that receives connection requests from clients. The server is built with a synchronous socket, so execution of the server application is suspended while it waits for a connection from a client. The application receives a string from the client, displays the string on the console, and then echoes the string back to the client. The string from the client must contain the string "<EOF>" to signal the end of the message.

Tutorial Synchronous Socket Programming using .NET (For Client)

The following example program creates a client that connects to a server. The client is built with a synchronous socket, so execution of the client application is suspended until the server returns a response. The application sends a string to the server and then displays the string returned by the server on the console.

CODE FOR VB

Imports System
Imports System.Net
Imports System.Net.Sockets
Imports System.Text