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Socket Programming in Java

Kiddoneeta

Oct 26, 2017

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Java Socket programming is used for communication between the applications running on different JRE.

Java Socket programming can be connection-oriented or connection-less.

Socket and ServerSocket classes are used for connection-oriented socket programming and DatagramSocket and DatagramPacket classes are used for connection-less socket programming.

The client in socket programming must know two information:1) IP Address of Server, and 2)Port number.

1) First open the two notepad.

A] In first notepad, type the code for server side and save it as the same class name which you have provided in the code and with the extension .java

For Example, MyServer1.java

import java.io.*; import java.net.*; public class MyServer1 { public static void main(String[] args) { try { ServerSocket ss=new ServerSocket(6666); Socket s=ss.accept();//establishes connection DataInputStream dis=new DataInputStream(s.getInputStream()); String str=(String)dis.readUTF(); System.out.println("message= "+str); System.out.println("message= "+str); System.out.println("message= "+str); ss.close(); } catch(Exception e) { System.out.println(e); } } }

B] In second notepad, type the code for the client side and save it as the same class name which you have provided in the code and with the extension .java

For Example, MyClient1.java

import java.io.*; import java.net.*; public class MyClient1 { public static void main(String[] args) { try { Socket s=new Socket("localhost",6666); DataOutputStream dout=new DataOutputStream(s.getOutputStream()); dout.writeUTF("Hello Server"); dout.flush(); dout.close(); s.close(); } catch(Exception e) { System.out.println(e); } } }