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jsquared21
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Add Ex31_03
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‎Exercise_31/Exercise_31_01/Exercise31_01Server.java‎

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -25,7 +25,8 @@ public void start(Stage primaryStage) {
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// Create a server socket
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ServerSocket serverSocket = new ServerSocket(8000);
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Platform.runLater(() ->
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ta.appendText("Exercise31_01Server started at" + new Date() + '\n'));
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ta.appendText("Exercise31_01Server started at "
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+ new Date() + '\n'));
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// Listen for a connection request
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Socket socket = serverSocket.accept();

‎Exercise_31/Exercise_31_03/Exercise31_03Client.class‎

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‎Exercise_31/Exercise_31_03/Exercise31_03Client.java‎

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import java.io.*;
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import java.net.*;
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import java.util.Date;
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import javafx.application.Application;
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import javafx.scene.Scene;
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import javafx.scene.layout.GridPane;
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import javafx.scene.layout.BorderPane;
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import javafx.scene.control.Button;
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import javafx.scene.control.ScrollPane;
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import javafx.scene.control.TextArea;
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import javafx.scene.control.TextField;
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import javafx.scene.control.Label;
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import javafx.geometry.Pos;
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import javafx.stage.Stage;
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public class Exercise31_03Client extends Application {
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// Create streams
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DataInputStream fromServer = null;
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DataOutputStream toServer = null;
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// Create text fields for loan information
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private TextField tfAnnuealInterestRate = new TextField();
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private TextField tfNumberOfYears = new TextField();
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private TextField tfLoanAmount = new TextField();
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// Create button for submitting loan info to the server
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private Button btSubmit = new Button("Submit");
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@Override // Override the start method in the Application class
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public void start(Stage primaryStage) {
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BorderPane pane = new BorderPane();
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// Set text fields alignment right
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tfAnnuealInterestRate.setAlignment(Pos.BASELINE_RIGHT);
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tfNumberOfYears.setAlignment(Pos.BASELINE_RIGHT);
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tfLoanAmount.setAlignment(Pos.BASELINE_RIGHT);
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// GridPane to hold loan information
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GridPane paneForLoanInfo = new GridPane();
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paneForLoanInfo.add(new Label("Annual Interest Rate"), 0, 0);
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paneForLoanInfo.add(tfAnnuealInterestRate, 1, 0);
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paneForLoanInfo.add(new Label("Number Of Years"), 0, 1);
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paneForLoanInfo.add(tfNumberOfYears, 1, 1);
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paneForLoanInfo.add(btSubmit, 2, 1);
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paneForLoanInfo.add(new Label("Loan Amount"), 0, 2);
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paneForLoanInfo.add(tfLoanAmount, 1, 2);
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// Text area to display contents
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TextArea ta = new TextArea();
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pane.setTop(paneForLoanInfo);
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pane.setCenter(new ScrollPane(ta));
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// Create a scene and place it in the stage
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Scene scene = new Scene(pane, 355, 200);
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primaryStage.setTitle("Exercise31_03Client"); // Set the stage title
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primaryStage.setScene(scene); // Place the scene in the stage
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primaryStage.show(); // Display the stage
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btSubmit.setOnAction(e -> {
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try {
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// Get the loan information from the text fields
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double annualInterestRate = Double.parseDouble(
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tfAnnuealInterestRate.getText().trim());
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int numberOfYears = Integer.parseInt(
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tfNumberOfYears.getText().trim());
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double loanAmount = Double.parseDouble(
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tfLoanAmount.getText().trim());
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// Send the loan information to the server
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toServer.writeDouble(annualInterestRate);
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toServer.writeInt(numberOfYears);
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toServer.writeDouble(loanAmount);
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toServer.flush();
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// Get monthly payment and total payment from the server
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double monthlyPayment = fromServer.readDouble();
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double totalPayment = fromServer.readDouble();
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// Display to text area
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ta.appendText("Annual Interest Rate: " + annualInterestRate + '\n');
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ta.appendText("Number Of Years: " + numberOfYears + '\n');
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ta.appendText("Loan Amount: " + loanAmount + '\n');
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ta.appendText("monthlyPayment: " + monthlyPayment + '\n');
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ta.appendText("totalPayment: " + totalPayment + '\n');
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}
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catch (IOException ex) {
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System.err.println(ex);
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}
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});
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try {
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// Create a socket to connect to the server
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Socket socket = new Socket("localhost", 8000);
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// Create an input stream to receive data from the server
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fromServer = new DataInputStream(socket.getInputStream());
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// Create an output stream to send data to the server
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toServer = new DataOutputStream(socket.getOutputStream());
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}
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catch (IOException ex) {
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ta.appendText(ex.toString() + '\n');
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}
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}
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}

‎Exercise_31/Exercise_31_03/Exercise31_03Server$HandleAClient.class‎

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‎Exercise_31/Exercise_31_03/Exercise31_03Server.class‎

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‎Exercise_31/Exercise_31_03/Exercise31_03Server.java‎

Lines changed: 105 additions & 0 deletions
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import java.io.*;
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import java.net.*;
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import java.util.Date;
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import javafx.application.Application;
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import javafx.application.Platform;
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import javafx.scene.Scene;
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import javafx.scene.control.TextArea;
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import javafx.scene.control.ScrollPane;
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import javafx.stage.Stage;
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public class Exercise31_03Server extends Application {
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// Text area for displaying contents
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private TextArea ta = new TextArea();
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// Number a client
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private int clientNo = 0;
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@Override // Override the start method in the Application class
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public void start(Stage primaryStage) {
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// Create a scene and place it in the stage
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Scene scene = new Scene(new ScrollPane(ta), 400, 200);
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primaryStage.setTitle("Exercise31_03Server"); // Set the stage title
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primaryStage.setScene(scene); // Place the scene in the stage
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primaryStage.show(); // Display the stage
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new Thread(() -> {
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try {
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// Create a server socket
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ServerSocket serverSocket = new ServerSocket(8000);
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Platform.runLater(() ->
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ta.appendText("Exercise31_03Server started at "
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+ new Date() + '\n'));
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while (true) {
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// Listen for a new connection request
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Socket socket = serverSocket.accept();
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Platform.runLater(() -> {
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// Display the client number
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ta.appendText("Starting thread for client " + ++clientNo +
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" at " + new Date() + '\n');
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});
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// Create and start a new thread for the connection
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new Thread(new HandleAClient(socket)).start();
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}
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}
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catch(IOException ex) {
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System.err.println(ex);
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}
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}).start();
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}
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// Define the thread class for handling new connection
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class HandleAClient implements Runnable {
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private Socket socket; // A connected socket
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/** Construct a thread */
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public HandleAClient(Socket socket) {
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this.socket = socket;
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}
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/** Run a thread */
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public void run() {
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try {
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// Create data input and output streams
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DataInputStream inputFromClient = new DataInputStream(
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socket.getInputStream());
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DataOutputStream outputToClient = new DataOutputStream(
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socket.getOutputStream());
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// Continuously serve the client
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while (true) {
75+
// Receive loan information from the client
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double annualInterestRate = inputFromClient.readDouble();
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int numberOfYears = inputFromClient.readInt();
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double loanAmount = inputFromClient.readDouble();
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// Compute monthly payments and total payment
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double monthlyInterestRate = annualInterestRate / 1200;
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double monthlyPayment = loanAmount * monthlyInterestRate / (
83+
1 - 1 / Math.pow(1 + monthlyInterestRate, numberOfYears * 12));
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double totalPayment = monthlyPayment * numberOfYears * 12;
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// Send monthly payment and total payment back to the client
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outputToClient.writeDouble(monthlyPayment);
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outputToClient.writeDouble(totalPayment);
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Platform.runLater(() -> {
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ta.appendText("Annual Interest Rate: " +
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annualInterestRate + '\n');
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ta.appendText("Number Of Years: " + numberOfYears + '\n');
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ta.appendText("Loan Amount: " + loanAmount + '\n');
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ta.appendText("monthlyPayment: " + monthlyPayment + '\n');
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ta.appendText("totalPayment: " + totalPayment + '\n');
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});
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}
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}
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catch(IOException ex) {
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ex.printStackTrace();
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}
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}
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}
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}

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