1. What is network communication programming?
Network communication programming is programming about designing and building network applications that allow data exchange and communication between computers and devices over a network.
2. Common concepts in network communication programming
When building a web application, there are a few main concepts that you generally need to understand:
2.1 Socket (Socket)
Sockets are endpoints used to communicate between computers.
They can establish connections on different network protocols (such as TCP/IP) to exchange data.
2.2 Connection
A connection is a logical connection between two sockets.
It allows two endpoints to communicate over a specific protocol.
2.3 Protocol
A protocol is a set of rules used to communicate between computer networks.
Common protocols include TCP (Transmission Control Protocol) and UDP (User Datagram Protocol).
2.4 Server and Client
In network communication, there are usually one or more servers waiting for requests from clients. The server usually provides some kind of service, such as file transfer, database access or web browsing.
Network communication programming involves the following main steps:
Creating a Socket: First you need to create a socket, which is an endpoint for communicating on the network.
Establishing the connection: Then, the socket needs to be connected with another socket so that they can start communicating.
Data exchange: Once the connection is established, data can be sent and received through the socket.
Close the connection: When the communication is completed, the connection needs to be closed to release resources.
Network communication programming can be used for a variety of applications, including but not limited to:
Web browsing: Web browsing is based on the HTTP protocol. The browser (client) requests a web page from the server through the HTTP protocol, and the server responds to the request and returns the content of the web page.
File Transfer: File transfers typically use protocols such as FTP (File Transfer Protocol) or HTTP. The client sends a file request to the server, the server accepts the request and sends the file to the client.
Mail sending and receiving: Email uses SMTP (Simple Mail Transfer Protocol) to send mail, and POP3 or IMAP protocol to receive mail.
Database access: Many applications connect to remote database servers over a network, querying and updating databases using protocols such as SQL.
When writing web applications, factors such as performance, security, and stability need to be considered. At the same time, with the development of technology, new network programming technologies and protocols continue to emerge, such as WebSocket, WebRTC, etc.
1. TCP protocol
2. UDP protocol
3. HTTP protocol
4. Socket
5. Netty
Common protocols in network communication programming
. Network communication programming involves a series of technologies and protocols,
(1) Common protocols include TCP (Transmission Control Protocol) and UDP (User Datagram Protocol)
Including TCP/IP, HTTP, SMTP, POP3, FTP, etc.