Tài liệu Network programming

Socket Basics
-A socket is a connection between two hosts. It can perform seven basic operations:
-Connect to a remote machine
-Send data
-Receive data
-Close a connection
-Bind to a port
-Listen for incoming data
-Accept connections from remote machines on the bound port
-Java's Socket class, which is used by both clients and servers, has methods that correspond to the first four of these operations. The last three operations are needed only by servers, which wait for clients to connect to them. They are implemented by the ServerSocket class