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Socket Programming In Java

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By Author: Wisemonkeys
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Java Socket programming is used to communicate between 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 pieces of information:1) the server's IP Address and 2) the Port number.
1) First open the two notepads.
A] In the 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); } } }
2) Output for the code:-
A] Server-Side :
Socket Programming

B] Client-Side :
Socket Programming

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