07_Networking

Networking in Java

Welcome to the Networking section! This section focuses on how Java allows computers to communicate over a network using various protocols.

Topics Covered:

1. IP Address Lookup - How to retrieve the IP address of a host.
2. Sockets - Using TCP/IP sockets to build a client-server application.
3. Echo Server/Client - Build simple echo server-client programs.

Example Programs:

1. HostNameToIP.java - A program that accepts a hostname and displays its IP address.

   • Concepts: Working with InetAddress to resolve IP addresses.

2. EchoServer.java & EchoClient.java - A pair of programs where the client sends a message to the server, and the server echoes it back.

   • Concepts: Working with ServerSocket, Socket, and streams.

3. TCPClientServer.java - A simple client-server program using TCP/IP, where the client sends messages to the server.

   • Concepts: Using TCP/IP sockets to exchange messages between client and server.

Exercises:

1. Write a program to display the IP address of any website by accepting the hostname from the user.
2. Write a simple echo server-client program where the server echoes whatever the client sends.
3. Create a TCP client-server application that sends a message from the client to the server and logs the message on both ends.

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Moving Forward:

After understanding the basics of networking, you can dive deeper into more advanced network programming topics like multithreaded servers, file transfer protocols, and web services.

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Files

• HostNameToIP.java: Displays IP address of a given host name.
• EchoServer.java: Echo server using sockets.
• EchoClient.java: Echo client using sockets.
• TCPClientServer.java: TCP/IP client-server program.