How do you write a socket program in Java?

Asked By: Douaae Ludwigsen | Last Updated: 12th March, 2020
Category: technology and computing programming languages
4/5 (49 Views . 22 Votes)
Example of Java Socket Programming (Read-Write both side)
  1. import java.net.*;
  2. import java.io.*;
  3. class MyServer{
  4. public static void main(String args[])throws Exception{
  5. ServerSocket ss=new ServerSocket(3333);
  6. Socket s=ss.accept();
  7. DataInputStream din=new DataInputStream(s.getInputStream());

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Also question is, what is socket in Java with example?

A socket in Java is one endpoint of a two-way communication link between two programs running on the network. A socket is bound to a port number so that the TCP layer can identify the application that data is destined to be sent to. An endpoint is a combination of an IP address and a port number.

Subsequently, question is, is Java socket TCP or UDP? Java has TCP and UDP sockets. The methods such as connect(), accept(), read(), and write() defined in the ServerSocket and Socket class are used for blocking socket programming. For example, when a client invokes the read() method to read data from the server, the thread gets blocked until the data is available.

Herein, how do you program a socket?

Socket programming is a way of connecting two nodes on a network to communicate with each other. One socket(node) listens on a particular port at an IP, while other socket reaches out to the other to form a connection. Server forms the listener socket while client reaches out to the server.

What are the types of sockets in Java?

Three types of sockets are supported:

  • Stream sockets allow processes to communicate using TCP. A stream socket provides bidirectional, reliable, sequenced, and unduplicated flow of data with no record boundaries.
  • Datagram sockets allow processes to use UDP to communicate.
  • Raw sockets provide access to ICMP.

32 Related Question Answers Found

Which language is best for socket programming?

C++ is the language of choice for game development. It has many pitfalls, but the advantages seem to outweigh that. If you use good C++ practices you will avoid most of the pitfalls and reasonably manage the ones you can't avoid.

What is meant by RMI?

The RMI (Remote Method Invocation) is an API that provides a mechanism to create distributed application in java. The RMI allows an object to invoke methods on an object running in another JVM. The RMI provides remote communication between the applications using two objects stub and skeleton.

What is the use of socket programming?

Socket programs are used to communicate between various processes usually running on different systems. It is mostly used to create a client-server environment. This post provides the various functions used to create the server and client program and an example program.

How do sockets work in Java?

Sockets provide the communication mechanism between two computers using TCP. 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.

What is port number in Java?


In java, there is no default port number ,you have to specify the port number. but port number from 1 to 1023 are for root user only and Port number from 1024 to 65535 are non root user port. you can directly use port numbers from 1024 to 65535 if they are available.

What is meant by socket in Java?

Definition: A socket is one endpoint of a two-way communication link between two programs running on the network. A socket is bound to a port number so that the TCP layer can identify the application that data is destined to be sent to. An endpoint is a combination of an IP address and a port number.

What is DatagramSocket?

net. DatagramSocket class in Java. Datagram socket is a type of network socket which provides connection-less point for sending and receiving packets. Every packet sent from a datagram socket is individually routed and delivered. It can also be used for sending and receiving broadcast messages.

What is client server in Java?

Client Server models in JAVA. It also sends and receives requests to and from one or more servers for other processing and/or data. ? Server ? A server consists of one or more computers that receive and process requests from one or more client machines.

What is TCP and UDP?

They are TCP or Transmission Control Protocol and UDP or User Datagram Protocol. TCP is connection oriented – once a connection is established, data can be sent bidirectional. UDP is a simpler, connectionless Internet protocol. Multiple messages are sent as packets in chunks using UDP.

What is client/server programming?


The client-server programming model is a distributed computing architecture that segregates information users (clients) from information providers (servers). A client is an application that needs something like a web page or IP address from a server. Clients may contact a server for this information at any time.

What is ServerSocket?

ServerSocket class represents a server socket. It is constructed on a particular port. Then it calls accept() to listen for incoming connections. accept() blocks until a connection is detected. On a server with multiple IP addresses, the getInetAddress() method tells you which one this server socket is listening to.

What is server in Java?

A Java EE server is a server application that the implements the Java EE platform APIs and provides the standard Java EE services. Java EE servers are sometimes called application servers, because they allow you to serve application data to clients, much like web servers serve web pages to web browsers.

What is TCP IP client socket in Java?

TCP/IP Client Sockets. TCP/IP sockets are used to implement reliable, bidirectional, persistent, point-to-point, stream-based connections between hosts on the Internet. A socket can be used to connect Java's I/O system to other programs that may reside either on the local machine or on any other machine on the Internet

What is Port Address?

A port number is the logical address of each application or process that uses a network or the Internet to communicate. A port number uniquely identifies a network-based application on a computer. This number is assigned automatically by the OS, manually by the user or is set as a default for some popular applications.

What is socket and how it works?


Sockets are commonly used for client and server interaction. The clients connect to the server, exchange information, and then disconnect. A socket has a typical flow of events. In a connection-oriented client-to-server model, the socket on the server process waits for requests from a client.

Is socket programming still used?

Most current network programming, however, is done either using sockets directly, or using various other layers on top of sockets (e.g., quite a lot is done over HTTP, which is normally implemented with TCP over sockets).

How do sockets work?

1 Answer. A client socket does not listen for incoming connections, it initiates an outgoing connection to the server. The server socket listens for incoming connections. A server creates a socket, binds the socket to an IP address and port number (for TCP and UDP), and then listens for incoming connections.