Add Ex31_03

Author: jsquared21

Exercise_31/Exercise_31_01/Exercise31_01Server.java

@@ -25,7 +25,8 @@ public void start(Stage primaryStage) {
 				// Create a server socket
 				ServerSocket serverSocket = new ServerSocket(8000);
 				Platform.runLater(() ->
-					ta.appendText("Exercise31_01Server started at" + new Date() + '\n'));
+					ta.appendText("Exercise31_01Server started at " 
+						+ new Date() + '\n'));
 
 				// Listen for a connection request
 				Socket socket = serverSocket.accept();

Exercise_31/Exercise_31_03/Exercise31_03Client.class

@@ -0,0 +1,107 @@
+import java.io.*;
+import java.net.*;
+import java.util.Date;
+import javafx.application.Application;
+import javafx.scene.Scene;
+import javafx.scene.layout.GridPane;
+import javafx.scene.layout.BorderPane;
+import javafx.scene.control.Button;
+import javafx.scene.control.ScrollPane;
+import javafx.scene.control.TextArea;
+import javafx.scene.control.TextField;
+import javafx.scene.control.Label;
+import javafx.geometry.Pos;
+import javafx.stage.Stage;
+
+public class Exercise31_03Client extends Application {
+	// Create streams
+	DataInputStream fromServer = null;
+	DataOutputStream toServer = null;
+
+	// Create text fields for loan information
+	private TextField tfAnnuealInterestRate = new TextField();
+	private TextField tfNumberOfYears = new TextField();
+	private TextField tfLoanAmount = new TextField();
+
+	// Create button for submitting loan info to the server
+	private Button btSubmit = new Button("Submit");
+
+	@Override // Override the start method in the Application class
+	public void start(Stage primaryStage) {
+		BorderPane pane = new BorderPane();
+
+		// Set text fields alignment right
+		tfAnnuealInterestRate.setAlignment(Pos.BASELINE_RIGHT);
+		tfNumberOfYears.setAlignment(Pos.BASELINE_RIGHT);
+		tfLoanAmount.setAlignment(Pos.BASELINE_RIGHT);
+
+		// GridPane to hold loan information
+		GridPane paneForLoanInfo = new GridPane();
+		paneForLoanInfo.add(new Label("Annual Interest Rate"), 0, 0);
+		paneForLoanInfo.add(tfAnnuealInterestRate, 1, 0);
+		paneForLoanInfo.add(new Label("Number Of Years"), 0, 1);
+		paneForLoanInfo.add(tfNumberOfYears, 1, 1);
+		paneForLoanInfo.add(btSubmit, 2, 1);
+		paneForLoanInfo.add(new Label("Loan Amount"), 0, 2);
+		paneForLoanInfo.add(tfLoanAmount, 1, 2);
+
+		// Text area to display contents
+		TextArea ta = new TextArea();
+		pane.setTop(paneForLoanInfo);
+		pane.setCenter(new ScrollPane(ta));
+
+		// Create a scene and place it in the stage
+		Scene scene = new Scene(pane, 355, 200);
+		primaryStage.setTitle("Exercise31_03Client"); // Set the stage title
+		primaryStage.setScene(scene); // Place the scene in the stage
+		primaryStage.show(); // Display the stage
+
+		btSubmit.setOnAction(e -> {
+			try {
+				// Get the loan information from the text fields
+				double annualInterestRate = Double.parseDouble(
+					tfAnnuealInterestRate.getText().trim());
+
+				int numberOfYears = Integer.parseInt(
+					tfNumberOfYears.getText().trim());
+
+				double loanAmount = Double.parseDouble(
+					tfLoanAmount.getText().trim());
+
+				// Send the loan information to the server
+				toServer.writeDouble(annualInterestRate);
+				toServer.writeInt(numberOfYears);
+				toServer.writeDouble(loanAmount);
+				toServer.flush();
+
+				// Get monthly payment and total payment from the server
+				double monthlyPayment = fromServer.readDouble();
+				double totalPayment = fromServer.readDouble();
+
+				// Display to text area
+				ta.appendText("Annual Interest Rate: " + annualInterestRate + '\n');
+				ta.appendText("Number Of Years: "  + numberOfYears + '\n');
+				ta.appendText("Loan Amount: " + loanAmount + '\n');
+				ta.appendText("monthlyPayment: " + monthlyPayment + '\n');
+				ta.appendText("totalPayment: " + totalPayment + '\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');
+		}
+	}
+}

Exercise_31/Exercise_31_03/Exercise31_03Client.java

@@ -0,0 +1,105 @@
+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_03Server extends Application {
+	// Text area for displaying contents
+	private TextArea ta = new TextArea();
+
+	// Number a client
+	private int clientNo = 0;
+
+	@Override // Override the start method in the Application class
+	public void start(Stage primaryStage) {
+
+		// Create a scene and place it in the stage
+		Scene scene = new Scene(new ScrollPane(ta), 400, 200);
+		primaryStage.setTitle("Exercise31_03Server"); // 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_03Server started at " 
+						+ new Date() + '\n'));
+
+				while (true) {
+					// Listen for a new connection request
+					Socket socket = serverSocket.accept();
+
+					Platform.runLater(() -> {
+						// Display the client number
+						ta.appendText("Starting thread for client " + ++clientNo + 
+							" at " + new Date() + '\n');  
+					});
+
+					// Create and start a new thread for the connection
+					new Thread(new HandleAClient(socket)).start();
+				}
+			}
+			catch(IOException ex) {
+				System.err.println(ex);
+			}
+		}).start();
+	}
+
+	// Define the thread class for handling new connection
+	class HandleAClient implements Runnable {
+		private Socket socket; // A connected socket
+
+		/** Construct a thread */
+		public HandleAClient(Socket socket) {
+			this.socket = socket;
+		}
+
+		/** Run a thread */
+		public void run() {
+			try {
+				// Create data input and output streams
+				DataInputStream inputFromClient = new DataInputStream(
+					socket.getInputStream());
+				DataOutputStream outputToClient = new DataOutputStream(
+					socket.getOutputStream());
+
+				// Continuously serve the client
+				while (true) {
+					// Receive loan information from the client
+					double annualInterestRate = inputFromClient.readDouble();
+					int numberOfYears = inputFromClient.readInt();
+					double loanAmount = inputFromClient.readDouble();
+
+					// Compute monthly payments and total payment
+					double monthlyInterestRate = annualInterestRate / 1200;
+					double monthlyPayment = loanAmount * monthlyInterestRate / (
+						1 - 1 / Math.pow(1 + monthlyInterestRate, numberOfYears * 12));
+					double totalPayment = monthlyPayment * numberOfYears * 12;
+
+					// Send monthly payment and total payment back to the client
+					outputToClient.writeDouble(monthlyPayment);
+					outputToClient.writeDouble(totalPayment);
+
+					Platform.runLater(() -> {
+						ta.appendText("Annual Interest Rate: " +
+							annualInterestRate + '\n');
+						ta.appendText("Number Of Years: " + numberOfYears + '\n');
+						ta.appendText("Loan Amount: " + loanAmount + '\n');
+						ta.appendText("monthlyPayment: " + monthlyPayment + '\n');
+						ta.appendText("totalPayment: " + totalPayment + '\n');
+					});
+				}
+			}
+			catch(IOException ex) {
+				ex.printStackTrace();
+			}
+		}
+	}
+}