How do I listen to a port in java?

Create a ServerSocket , specifying a port to listen on. Invoke the ServerSocket ‘s accept() method to listen on the configured port for a client connection. When a client connects to the server, the accept() method returns a Socket through which the server can communicate with the client.

How do I connect a socket in java?

1. Create and open a server socket. View. ServerSocket serverSocket = new ServerSocket(portNumber);
2. Wait for the client request. View.
3. Create input and output streams to the socket. View.
4. Communicate with the client. Receive data from the client: (inputLine = in.readLine() )
5. Close the stream, and then close the socket.

Which of the ServerSocket method listen client request for connection?

Server Socket Methods

1. bind() − This method binds the address (hostname, port number) to the socket.
2. listen() − This method basically listens to the connections made to the socket. It starts TCP listener.
3. accept() − This will accept TCP client connection. The pair (conn, address) is the return value pair of this method.

How do I create a TCP connection in java?

Java Socket Server Examples (TCP/IP)

1. Create a server socket and bind it to a specific port number.
2. Listen for a connection from the client and accept it.
3. Read data from the client via an InputStream obtained from the client socket.
4. Send data to the client via the client socket’s OutputStream.

How does a socket connection work in Java?

This article describes a very basic one-way Client and Server setup where a Client connects, sends messages to server and the server shows them using socket connection.

How to listen to a port via a Java socket?

The second line will block until some other piece of software connects to your machine on port 4000. Then you can read from the returned socket. Look at this tutorial, this is actually a very broad topic (threading, protocols…)

Do you need a server socket for listening?

Listening is a traditionally a role of a server so you need a ServerSocket as I suggested. The client needs a client socket to connect to this server in a similar way you did that in your example (however in your code you should send rather than receive messages; your receiving code goes to ServerSocket side).

How to write Java socket server, client example?

In java socket programming example tutorial, we will learn how to write java socket server and java socket client program. We will also learn how server client program read and write data on the socket. java.net.Socket and java.net.ServerSocket are the java classes that implements Socket and Socket server.