I'm very new to Java here. I have a program which acts like a calculator between client and server. the client will enter their function like this (+ 1 2). But now Im giving it a GUI interface. How do i pass the user input from GUI to client console then pass it to the server to calculate and then displaying it back to the UI? i just need something simple.
client
import java.io.*;
import java.net.Socket;
import java.util.Scanner;
import java.awt.*; // using AWT containers and components
import java.awt.event.*; // using AWT events and listener interfaces
import javax.swing.*;
public class mathClient extends JFrame implements ActionListener {
private int count = 0;
private JFrame frame;
private JPanel panel;
private JLabel lblInput;
private JLabel lblOutput;
private JTextField tfInput;
private JTextField tfOutput;
/** The entry main() method */
public static void main(String[] args) throws Exception {
// Invoke the constructor to setup the GUI, by allocating an instance
mathClient app = new mathClient();
}
public void actionPerformed(ActionEvent event){
try{
Socket clientSocket = new Socket("localhost", 50000);
BufferedReader inFromServer = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
DataOutputStream outToServer = new DataOutputStream(clientSocket.getOutputStream());
PrintWriter print = new PrintWriter(clientSocket.getOutputStream(), true);
String input;
String output;
//String input;
while(true){
//System.out.println("Please enter your function and numbers:");
input = tfInput.getText();
print.println(input);
if(input.equals("disconnect")){
break;
}
output = inFromServer.readLine();
System.out.println(output);
tfOutput.setText(output);
}
clientSocket.close();
}
catch (Exception e)
{
}
}
public mathClient()
{
Container contentPane = getContentPane();
contentPane.setLayout(new BorderLayout());
JFrame frame = new JFrame("Calculator");
JPanel panel = new JPanel();
JLabel lblInput = new JLabel("Input: ");
JLabel lblOutput = new JLabel("Output: ");
JTextField tfInput = new JTextField();
tfInput.setEditable(true);
// tfInput.addActionListener();
JTextField tfOutput = new JTextField();
tfOutput.setEditable(false);
JButton btnCalculate = new JButton("Calculate");
btnCalculate.addActionListener(this);
frame.add(panel);
panel.add(lblInput);
panel.add(tfInput);
panel.add(lblOutput);
panel.add(tfOutput);
panel.add(btnCalculate);
tfInput.setPreferredSize(new Dimension(200, 30));
tfOutput.setPreferredSize(new Dimension(200, 30));
frame.pack();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(230,250);
frame.setResizable(false);
frame.setVisible(true);
}
}
Server
import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;
// Takes in a mathematical operation and the operands from a client and returns the result
// Valid operations are add, sub, multiply, power, divide, remainder, square
public class mathServer
{
public static void main(String [] args) throws IOException
{
ServerSocket welcomeSocket = new ServerSocket(50000); //put server online
while(true)
{
System.out.println("Waiting for connection...");
Socket connectionSocket = welcomeSocket.accept(); //open server to connections
System.out.println("Connection accepted");
process(connectionSocket); //process accepted connection
System.out.println("Connection closed");
}
}
//BufferedReader(Reader r)
static void process(Socket welcomeSocket) throws IOException
{
InputStream in = welcomeSocket.getInputStream();
BufferedReader buffer = new BufferedReader(new InputStreamReader(in));
OutputStream out = welcomeSocket.getOutputStream();
PrintWriter print = new PrintWriter(out, true);
String input = buffer.readLine(); //get user input from client
while(input != null && !input.equals("disconnect")) //check for input, if bye exit connection
{
int answer = operate(input); //perform desired operation on user input
print.println(answer); //print out result
input = buffer.readLine(); //get next line of input
}
welcomeSocket.close();
}
//Talk to the client
static int operate(String s)
{
System.out.println(s); //check if same as client input
Scanner scanner = new Scanner(s);
char option = scanner.next().charAt(0); //gets desired operation
System.out.println(option); //checks for correct operation
switch (option) {
case '+':
return (scanner.nextInt() + scanner.nextInt());
case '-':
return (scanner.nextInt() - scanner.nextInt());
case '*':
return (scanner.nextInt() * scanner.nextInt());
case '^':
return (int) Math.pow(scanner.nextInt(), scanner.nextInt());
case '/':
return scanner.nextInt() / scanner.nextInt();
case '%':
return scanner.nextInt() % scanner.nextInt();
case 's':
return (int) Math.pow(scanner.nextInt(), 2);
default:
return (int) Math.pow(scanner.nextInt(), 3);
}
}
}
