Installation of JDK and NetBeans
To complete the client server socket programming, we need to install JDK and NetBeans software. Download the softwares from oracle.com website (Oracle.com, 2018). The below image is the oracle website. First accept the license agreement and then click the link as per our operating system.
After downloading the software, we need to run it for complete the installation on the system.
After completing the configuration, the below window will be opened. Click the next button to select the path for installing the software.
Select the path for JDK as mentioned in the below image. Default path is viewed in below image. We can change the path for installing the software by choosing the browse button.
Also we can select the path for JDK installation for NetBeans IDE and then click the next button.
After clicking the net button, the below window is opened. Then click the install button to install the software.
After completion of JDK software, NetBeans (Netbeans.org, 2018) software is started to install as viewd in below image.
Open the NetBeans software and click the file menu and then click the “New Project” as viewed in the below window. It opens the new window select the project name and package.
Select the option Java and Java Application and then click the next button to create the Java program.
Then give the name for the java program and select the path to save the program and then click finish button.
After that creating the server class, right click on the project name on the left side panel and click the option new class to create the client class. It will open the new window to give the class name.
Then click the finish button to create a client class. After completing the code for both class we can run the client server chat program.
Etract the file as viewed in below image. Then go to the NetBeans software to open the java program.
Select the file menu and then select the Open Project. It will open a new window to choose the java file.
Select the java file and click the open project button is available on the lower right corner of the window. It will open the project on NetBeans window.
To run the client server program, right click on the project name on the left side panel of NetBeans window.
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package server;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;
/**
*
* @author DELL 3521
*/
public class Server {
static ServerSocket sSock;
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
// TODO code application logic here
responsePrefix = args[0].toString();
sPort = Integer.parseInt(args[1]);
System.err.println(“Socket Port: ” + sPort);
try {
Creating a Java Application
ServerSocket sSock = new ServerSocket(1254);
Socket sk=sSock.accept();
BufferedReader cin = new BufferedReader(new InputStreamReader(sk.getInputStream()));
PrintStream cout = new PrintStream(sk.getOutputStream());
BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
System.out.println(“Type and press Enter key”);
String s;
Scanner sc = new Scanner(System.in);
while(true)
{
s = cin.readLine();
System.out.print(“Client: “+s+””);
System.out.print(“Server : “);
s = sc.nextLine();
if(s.equalsIgnoreCase(“bye”))
{
cout.println(“BYE”);
System.out.println(“Connection is terminated”);
break;
}
cout.println(s);
}
sSock.close();
sk.close();
cout.close();
stdin.close();
}
catch(IOException e)
{
e.printStackTrace();
}
}
} (Www2.ic.uff.br, 2018)
Code for Client.java
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package server;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.net.Socket;
import java.util.Scanner;
/**
*
* @author DELL 3521
*/
public class Client
{
static Socket sk;
static int sPort;
static String responsePrefix;
public static void main(String args[]) {
responsePrefix = args[0].toString();
sPort = Integer.parseInt(args[1]);
System.err.println(“Socket Port: ” + sPort);
try {
Socket sk = new Socket(“127.0.0.1”, 2000);
BufferedReader sin = new BufferedReader(new InputStreamReader(sk.getInputStream()));
PrintStream sout = new PrintStream(sk.getOutputStream());
BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
String s;
Scanner sc = new Scanner(System.in);
while(true)
{
System.out.print(“Client: “);
s=stdin.readLine();
sout.println(s);
if(s.equalsIgnoreCase(“bye”))
{
System.out.println(“Connection is terminated”);
break;
}
s = sin.readLine();
System.out.println(“Server : “+s+”n”);
}
sk.close();
sin.close();
sout.close();
stdin.close();
}
catch(IOException e)
{
e.printStackTrace();
}
}
} (Oracle.com, n.d.)
Class diagram is a static diagram. It is used to build the execution code to create a software application. There are number of steps available to create a client server socket for chatting both client and server. First we need to create a socket. Then bind the sockets with local address. Then create TCP connection to connect the server and client. Then messages are send and receive between the server and client. Finally close all the connection when complete the chat by client and server (Ibm.com, 2018). These all the steps are converted to executable code. The class diagram is used to build the code for all the steps. First find the required element of the program. Here the elements are Client, Server, Worker and Timer. Then find out the relationship between the class elements. Many to one relationship is available between the client and server. That is more clients can communicate with one server. Then Worker can save the all clients request and put in the queue. Timer can manage the requests as in one to many relationship. First part of the class diagram specifies the class or element name. Second part of the class diagram specifies the variables used for the particular class also called the second part as instance of a class or element. Then the third part of the diagram specifies the implementation method of the class. This diagram gives the clear structure of the overall application. It also reduces the complexity of an execution of the software application.
References
Design and Architecture. (2018). [ebook] Available at: https://www.cs.waikato.ac.nz/~bernhard/314/DesignReport.pdf [Accessed 28 Jun. 2018].
Ibm.com. (2018). IBM Knowledge Center. [online] Available at: https://www.ibm.com/support/knowledgecenter/en/SSLTBW_2.1.0/com.ibm.zos.v2r1.halc001/o4ag1.htm [Accessed 28 Jun. 2018].
Netbeans.org. (2018). [online] Available at: https://netbeans.org/downloads/?pagelang=pt_BR [Accessed 28 Jun. 2018].
Oracle.com. (2018). Java SE Downloads – NetBeans + JDK Bundle. [online] Available at: https://www.oracle.com/technetwork/java/javase/downloads/jdk-netbeans-jsp-142931.html [Accessed 28 Jun. 2018].
Oracle.com. (n.d.). Lesson 1: Socket Communications. [online] Available at: https://www.oracle.com/technetwork/java/socket-140484.html [Accessed 28 Jun. 2018].
Www2.ic.uff.br. (2018). Socket Programming in Java. [online] Available at: https://www2.ic.uff.br/~michael/kr1999/2-application/2_06-sockettcp.htm [Accessed 28 Jun. 2018].
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