June 3 Suppose you're asked to create a Java applet that needs to communicate back to a web server i.
Next Page The term network programming refers to writing programs that execute across multiple devices computersin which the devices are all connected to each other using a network. A client program creates a socket on its end of the communication and attempts to connect that socket to a server.
When the connection is made, the server creates a socket object on its end of the communication. The client and the server can now communicate by writing to and reading from the socket.
Socket class represents a socket, and the java.
ServerSocket class provides a mechanism for the server program to listen for clients and establish connections with them. The server invokes the accept method of the ServerSocket class. This method waits until a client connects to the server on the given port. After the server is waiting, a client instantiates a Socket object, specifying the server name and the port number to connect to.
The constructor of the Socket class attempts to connect the client to the specified server and the port number. If communication is established, the client now has a Socket object capable of communicating with the server.
On the server side, the accept method returns a reference to a new socket on the server that is connected to the client's socket.
Each socket has both an OutputStream and an InputStream. TCP is a two-way communication protocol, hence data can be sent across both streams at the same time.
Following are the useful classes providing complete set of methods to implement sockets. ServerSocket Class Methods The java. ServerSocket class is used by server applications to obtain a port and listen for client requests.
An exception occurs if the port is already bound by another application. The InetAddress is used for servers that may have multiple IP addresses, allowing the server to specify which of its IP addresses to accept client requests on.
When using this constructor, use the bind method when you are ready to bind the server socket. If the ServerSocket constructor does not throw an exception, it means that your application has successfully bound to the specified port and is ready for client requests.
This method is useful if you passed in 0 as the port number in a constructor and let the server find a port for you. This method blocks until either a client connects to the server on the specified port or the socket times out, assuming that the time-out value has been set using the setSoTimeout method.
Otherwise, this method blocks indefinitely. Use this method if you have instantiated the ServerSocket using the no-argument constructor. When the ServerSocket invokes acceptthe method does not return until a client connects. After a client does connect, the ServerSocket creates a new Socket on an unspecified port and returns a reference to this new Socket.
A TCP connection now exists between the client and the server, and communication can begin. Socket Class Methods The java. Socket class represents the socket that both the client and the server use to communicate with each other.
The client obtains a Socket object by instantiating one, whereas the server obtains a Socket object from the return value of the accept method.P.S. - If you are an experienced Java/JEE Program and want to learn Spring Security end-to-end, I recommend Learn Spring Security course by Eugen Paraschiv, The definitive guide to secure your Java application.
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