Network programming

• Java

1、 Seven layer model of network

From bottom to top are physical layer (circuit, wiring) - data link layer (switch) - network layer (TCP / IP, router) - transport layer - session layer - presentation layer (encoding, decoding, encryption, decryption, compression, decompression) - application layer (HTTP), but the TCP / IP model is network interface layer - network layer - transport layer - application layer

2、 Three handshakes and four waves

1. Three handshakes:

(1) The client sends a request to the network server (are you there?)

(2) The server responds to the client's request (I'm here)

(3) The server sends a request to the client (I'm here, are you there?)

2. Four waves

(1) The client sends a request to the server (I'm leaving)

(2) Server response client (mm)

(3) The client sends a request to the server again (I really want to leave)

(4) The server responds to the client (well, let's go)

3、 Main functions of commonly used InetAddress

Output results:

xxxx/192.168. 152.1192. 168.152. one

4、 Communication between TCP programming server and client

1. Server code

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