import java.io.*;

import java.net.*;

import java.util.Date;

import javafx.application.Application;

import javafx.geometry.Pos;

import javafx.scene.Scene;

import javafx.scene.control.Button;

import javafx.scene.control.Label;

import javafx.scene.control.TextArea;

import javafx.scene.control.TextField;

import javafx.scene.control.Label;

import javafx.scene.control.ScrollPane;

import javafx.scene.layout.GridPane;

import javafx.scene.layout.BorderPane;

import javafx.stage.Stage;

public class Exercise31_02Client extends Application {

// IO streams

DataOutputStream toServer = null;

DataInputStream fromServer = null;

// Text fields for BMI information

private TextField tfWeight = new TextField();

private TextField tfHeight = new TextField();

@Override // Override the start method in the Application class

public void start(Stage primaryStage) {

// Main pane

BorderPane pane = new BorderPane();

// Set text field alignment right

tfWeight.setAlignment(Pos.BASELINE_RIGHT);

tfHeight.setAlignment(Pos.BASELINE_RIGHT);

// Create button to send BMI info to server

Button btSubmit = new Button("Submit");

// Pane to hold BMI information and submit button

GridPane paneForBmiInfo = new GridPane();

paneForBmiInfo.add(new Label("Weight in pounds"), 0, 0);

paneForBmiInfo.add(tfWeight, 1, 0);

paneForBmiInfo.add(new Label("Height in inches"), 0, 1);

paneForBmiInfo.add(tfHeight, 1, 1);

paneForBmiInfo.add(btSubmit, 2, 1);

// Text Area to display contents

TextArea ta = new TextArea();

pane.setTop(paneForBmiInfo);

pane.setCenter(new ScrollPane(ta));

// Create a scene and place it in the stage

Scene scene = new Scene(pane, 400, 200);

primaryStage.setTitle("Exercise31_01Client"); // Set the stage title

primaryStage.setScene(scene); // Place the scene in the stage

primaryStage.show(); // Display the stage

btSubmit.setOnAction(e -> {

try {

// Get the weight and height from the text fields

double weight = Double.parseDouble(tfWeight.getText().trim());

double height = Double.parseDouble(tfHeight.getText().trim());

// Send the BMI information to the server

toServer.writeDouble(weight);

toServer.writeDouble(height);

toServer.flush();

// Get string from the server

String bmi = fromServer.readUTF();

// Display to text area

ta.appendText("Weight: " + weight + '\n');

ta.appendText("Height: " + height + '\n');

ta.appendText(bmi + '\n');

}

catch (IOException ex) {

System.err.println(ex);

}

});

try {

// Create a socket to connect to the server

Socket socket = new Socket("localhost", 8000);

// Create an input stream to receive data from the server

fromServer = new DataInputStream(socket.getInputStream());

// Create an output stream to send data to the server

toServer = new DataOutputStream(socket.getOutputStream());

}

catch (IOException ex) {

ta.appendText(ex.toString() + '\n');

}

}

}

import java.io.*;

import java.net.*;

import java.util.Date;

import javafx.application.Application;

import javafx.application.Platform;

import javafx.scene.Scene;

import javafx.scene.control.TextArea;

import javafx.scene.control.ScrollPane;

import javafx.stage.Stage;

public class Exercise31_02Server extends Application {

final double KILOGRAMS_PER_POUND = 0.45359237; // Kilograms per pound

final double METERS_PER_INCH = 0.0254; // Meters per Inch

@Override // Override the start method in the Application class

public void start(Stage primaryStage) {

// Text area for displaying contents

TextArea ta = new TextArea();

// Create a scene and place it in the stage

Scene scene = new Scene(new ScrollPane(ta), 450, 200);

primaryStage.setTitle("Exercise31_02Server"); // Set the stage title

primaryStage.setScene(scene); // Place the scene in the stage

primaryStage.show(); // Display the stage

new Thread(() -> {

try {

// Create a server socket

ServerSocket serverSocket = new ServerSocket(8000);

Platform.runLater(() ->

ta.appendText("Exercise31_02Server started at "

+ new Date() + '\n'));

// Listen for a connection request

Socket socket = serverSocket.accept();

// Create data input and output streams

DataInputStream inputFromClient = new DataInputStream(

socket.getInputStream());

DataOutputStream outputToClient = new DataOutputStream(

socket.getOutputStream());

while (true) {

Date date = new Date();

// Receive the weight and height from the server

double weight = inputFromClient.readDouble();

double height = inputFromClient.readDouble();

// Compute the BMI (Body Mass Index)

double weightInKilograms = weight * KILOGRAMS_PER_POUND;

double heightInMeters = height * METERS_PER_INCH;

double bmi = weightInKilograms / Math.pow(heightInMeters, 2);

// Create string with BMI information

StringBuilder strBMI = new StringBuilder("BMI is " +

String.format("%.2f", bmi) + ". ");

if (bmi < 18.5)

strBMI.append("Underweight");

else if (bmi < 25)

strBMI.append("Normal");

else if (bmi < 30)

strBMI.append("Overweight");

else

strBMI.append("Obese");

// Send string back to client

outputToClient.writeUTF(strBMI.toString());

Platform.runLater(() -> {

ta.appendText("Connected to a client at " + date + '\n');

ta.appendText("Weight: " + weight + '\n');

ta.appendText("Height: " + height + '\n');

ta.appendText(strBMI.toString() + '\n');

});

}

}

catch (IOException ex) {

ex.printStackTrace();

}

}).start();

}

}