Network Programming Tutorial: How To Create Connection Between Client And Server Using Netbeans IDE 7.0.1

What Will I Learn?

• You will learn how to create client and server program
• You will learn how to make communication between two program
• You will learn how to create connection between client and server
• You will learn to create two class in one package on netbeans

Requirements

• you must understand basic of java programming
• you must understand how to create stucture beetween two progran on the package
• you must know how to implement java program on netbeans IDE
• The Java Software Development Kit must be installed on your system
• Netbeans IDE should also be installed on your system

Difficulty

• Basic

Tutorial Contents

• first open netbeans IDE aplication
  
  i use netbeans IDE 7.0.1 version
• second, create new project, select java category, and in project select java aplication, then press next.
  

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• then write down the name of your project, hit finish
  
• the next step is to create a file with the name client.java as in the picture below.
  

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• type the program below into the client program field, and I will explain a bit about the program below.

package clientserver;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.Socket;
public class Client {
public static void main(String[] args)throws IOException {
Socket sock=new Socket("localhost", 6066);
DataInputStream in= new DataInputStream(sock.getInputStream());
System.out.println(in.readUTF());
DataOutputStream out =new DataOutputStream(sock.getOutputStream());
out.writeUTF("what is youre name");
sock.close();
}}

• below is an explanation of the above program.
  package clientserver;
  this is the name of the package where the client server program is located

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import java.io.DataInputStream;
Java DataInputStream class lets you read Java primitives (int, float, long etc.)

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import java.io.DataOutputStream;
import java.io.DataOutputStream; allows the application to write Java primitive data types to output in a portable way. The application can then use the data input stream to re-read the data.

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import java.io.IOException;
This class is a general class of exceptions generated by failed or interrupted I / O operations.

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import java.net.Socket;
This class works to listen to connections that have occurred and ready to receive requests from other processes.

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public class Client {
declaration for the class client

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public static void main(String[] args)throws IOException {
public static void main is an element that must exist in java programming language

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Socket sock=new Socket("localhost", 6066);
This is the declaration of a new object named "sock"

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DataInputStream in= new DataInputStream(sock.getInputStream());
This is the shortcut of objects in the DatasInputStream class

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System.out.println(in.readUTF());
Command to display the output to the monitor

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DataOutputStream out =new DataOutputStream(sock.getOutputStream());
This is the creation of the output object in the DataInputStream class

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out.writeUTF("what is youre name");
this is the command to display the text on the output
sock.close();

• After creating the client program we will create a server program, create a file with the name Server.java.
  
• then type the program below in Server.java file

package clientserver;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;3
public class Server {
    public static void main(String[] args) throws IOException{
       ServerSocket serverSock=new ServerSocket(6066);
       Socket Sock=serverSock .accept();
       DataOutputStream out =new DataOutputStream(Sock.getOutputStream());
       out.writeUTF("my name is lapulga");
       DataInputStream in= new DataInputStream(Sock.getInputStream());
        System.out.println(in.readUTF());
       Sock.close(); }}

• the difference between the client program and the server program is on the syntaxSocket Sock=serverSock .accept(); which serves to receive requests from the client.
• after we create both programs then we try to run both programs as shown below.
  
• run both.
• then we will see the output.

client output:

server output:

application using this method:

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work principle

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this method serves to connect between the client with the server on the program above shows that we try to send a message to the server and then the server answered. this method is very much used in chatingan applications such as yahoo mesengger and others.

Curriculum

Place here a list of related tutorials you have already shared on Utopian that make up a Course Curriculum, if applicable.

• Example Tutorial A
• Example Tutorial B
• Example Tutorial C
• Example Tutorial D

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