How To Create A Chat Server In Java

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• Updated date Sep 30, 2019

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In this article, you will learn how to make a chat Application , using Sockets in Java.

Introduction

In this tutorial, we will see a Chat Application in Java, which is another module of a remote procedure call.  We will deal with sockets and its parameter, to work out with our requirement.  For generations, remote procedure call has been used to make message passing system in any environment.  It can be a distributed system, standalone, or any client Server environment.

For details and a brief explanation of remote procedure calls, you can read this article to help understand, in quite a decent manner – Remote Procedure call.

Prerequisite

1. Installed Java
2. NetBeans SDK

Once NetBeans is installed, you have to make a Java Application.  Name it as – Chat application.  This will create a chat Application project inside your IDE.  Also, there will be a main.java file created, which you can delete, as it is not required.

Once you are done with this, right-click on the project -- > New -- > Select JFrame Form.  You have to make two Jframe forms, one for Client and one for Server.  Jframe is used to make a design of your Application.  it has a simple configuration, which is similar to ASPX pages.  Also, it has a decent toolbox with drag and drop functionality.  Now, create two Jframe and name them Client.java and Server.java.  Afterward, design is given below.

Client.java

You have to drag and drop these controls – TextArea, TextField, Button and Label.  TextArea is used to view the incoming messages and TextField is used to write the message.

Server.java

Now that the coding part is there.  Open client.java and Server.java.  Enter the code part.

Client.java

1. package  chatapplication;
2. import  java.io.DataInputStream;
3. import  java.io.DataOutputStream;
4. import  java.net.Socket;
5. public class  client extends  javax.swing.JFrame {
6. static  Socket sckt;
7. static  DataInputStream dtinpt;
8. static  DataOutputStream dtotpt;
9. public  client() {
10.   initComponents();
11.  }
12. @SuppressWarnings ( "unchecked" )
13. private void  initComponents() {}
14. private void  jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
15. try  {
16.    String msgout ="" ;
17.    msgout = jTextField1.getText().trim();
18.    dtotpt.writeUTF(msgout);
19.   }catch  (Exception e) {}
20.  }
21. public static void  main(String args[]) {
22.   java.awt.EventQueue.invokeLater(new  Runnable() {
23. public void  run() {
24. new  client().setVisible( true );
25.    }
26.   });
27. try  {
28.    sckt =new  Socket( "127.0.0.1" , 1201 );
29.    dtinpt =new  DataInputStream(sckt.getInputStream());
30.    dtotpt =new  DataOutputStream(sckt.getOutputStream());
31.    String msgin ="" ;
32. while  (!msgin.equals( "Exit" )) {
33.     msgin = dtinpt.readUTF();
34.     jTextArea1.setText(jTextArea1.getText().trim() +"\n Server:"  + msgin);
35.    }
36.   }catch  (Exception e) {}
37.  }
38. private  javax.swing.JButton jButton1;
39. private  javax.swing.JLabel jLabel1;
40. private  javax.swing.JLabel jLabel2;
41. private  javax.swing.JScrollPane jScrollPane1;
42. private static  javax.swing.JTextArea jTextArea1;
43. private  javax.swing.JTextField jTextField1;
44. }

Server. Java

1. package  chatapplication;
2. import  java.io.DataInputStream;
3. import  java.io.DataOutputStream;
4. import  java.net.ServerSocket;
5. import  java.net.Socket;
6. public class  Server extends  javax.swing.JFrame {
7. static  ServerSocket ssckt;
8. static  Socket sckt;
9. static  DataInputStream dtinpt;
10. static  DataOutputStream dtotpt;
11. public  Server() {
12.   initComponents();
13.  }
14. @SuppressWarnings ( "unchecked" )
15. private void  initComponents() {}
16. private void  btnsendActionPerformed(java.awt.event.ActionEvent evt) {
17. try  {
18.    String msgout ="" ;
19.    msgout = txtbxfield.getText().trim();
20.    dtotpt.writeUTF(msgout);
21.   }catch  (Exception e) {}
22.  }
23. public static void  main(String args[]) {
24.   java.awt.EventQueue.invokeLater(new  Runnable() {
25. public void  run() {
26. new  Server().setVisible( true );
27.    }
28.   });
29.   String msgin ="" ;
30. try  {
31.    ssckt =new  ServerSocket( 1201 );
32.    sckt = ssckt.accept();
33.    dtinpt =new  DataInputStream(sckt.getInputStream());
34.    dtotpt =new  DataOutputStream(sckt.getOutputStream());
35. while  (!msgin.equals( "exit" )) {
36.     msgin = dtinpt.readUTF();
37.     txtbxarea.setText(txtbxarea.getText().trim() +"\n Client:"  + msgin);
38.    }
39.   }catch  (Exception e) {}
40.  }
41. private  javax.swing.JButton btnsend;
42. private  javax.swing.JLabel jLabel1;
43. private  javax.swing.JLabel jLabel2;
44. private  javax.swing.JScrollPane jScrollPane1;
45. private static  javax.swing.JTextArea txtbxarea;
46. private  javax.swing.JTextField txtbxfield;
47. }

Output

I hope you like it.  Thank you for reading.  Have a good day.

How To Create A Chat Server In Java

Source: https://www.c-sharpcorner.com/article/how-to-make-a-chat-application-using-sockets-in-java/

Posted by: hubbardwhationam.blogspot.com

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