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‎Chapter_31/exercise_31_06Client/Exercise_31_06Client.java‎

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package exercise_31_06Client;
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import java.io.*;
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import java.net.*;
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import javafx.application.Application;
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import javafx.geometry.Insets;
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import javafx.geometry.Pos;
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import javafx.scene.Scene;
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import javafx.scene.control.Button;
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import javafx.scene.control.Label;
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import javafx.scene.control.TextField;
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import javafx.scene.layout.BorderPane;
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import javafx.scene.layout.GridPane;
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import javafx.scene.layout.HBox;
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import javafx.stage.Stage;
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public class Exercise_31_06Client extends Application implements StudentAddressConstants {
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private TextField tfName = new TextField();
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private TextField tfStreet = new TextField();
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private TextField tfCity = new TextField();
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private TextField tfState = new TextField();
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private TextField tfZip = new TextField();
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private Button btAdd = new Button("Add");
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private Button btFirst = new Button("First");
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private Button btNext = new Button("Next");
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private Button btPrevious = new Button("Previous");
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private Button btLast = new Button("Last");
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private String host = "localhost";
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private Socket socket;
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private ObjectOutputStream outputToServer;
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private ObjectInputStream inputFromServer;
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@Override
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public void start(Stage primaryStage) {
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BorderPane borderPane = new BorderPane();
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borderPane.setPadding(new Insets(5, 15, 5, 15));
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GridPane pane = new GridPane();
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pane.setVgap(3);
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pane.setHgap(3);
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pane.setPadding(new Insets(3));
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pane.add(new Label("Name"), 0, 0);
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pane.add(tfName, 1, 0);
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pane.add(new Label("Street"), 0, 1);
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pane.add(tfStreet, 1, 1);
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pane.add(new Label("City"), 0, 2);
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HBox hBox = new HBox(2);
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pane.add(hBox, 1, 2);
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hBox.getChildren().addAll(tfCity, new Label("State"), tfState, new Label("Zip"), tfZip);
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pane.setAlignment(Pos.CENTER);
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borderPane.setCenter(pane);
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HBox hBoxForButtons = new HBox(5);
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hBoxForButtons.getChildren().addAll(btAdd, btFirst, btNext, btPrevious, btLast);
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hBoxForButtons.setAlignment(Pos.CENTER);
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borderPane.setBottom(hBoxForButtons);
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tfName.setPrefColumnCount(15);
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tfStreet.setPrefColumnCount(15);
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tfCity.setPrefColumnCount(10);
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tfState.setPrefColumnCount(2);
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tfZip.setPrefColumnCount(3);
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try {
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socket = new Socket(host, 8000);
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outputToServer = new ObjectOutputStream(socket.getOutputStream());
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inputFromServer = new ObjectInputStream(socket.getInputStream());
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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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btAdd.setOnAction(e -> {
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try {
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StudentAddress address = getDataFromTextFields();
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outputToServer.writeInt(ADD);
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outputToServer.writeObject(address);
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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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setButtonAction(btFirst, FIRST);
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setButtonAction(btNext, NEXT);
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setButtonAction(btPrevious, PREVIOUS);
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setButtonAction(btLast, LAST);
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Scene scene = new Scene(borderPane);
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primaryStage.setTitle("Exercise_31_06Client");
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primaryStage.setScene(scene);
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primaryStage.show();
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}
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private void setButtonAction(Button bt, int request) {
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bt.setOnAction(e -> {
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try {
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outputToServer.writeInt(request);
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setTextFields((StudentAddress)(inputFromServer.readObject()));
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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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catch (ClassNotFoundException ex) {
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ex.printStackTrace();
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}
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});
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}
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private void setTextFields(StudentAddress data) {
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tfName.setText(data.getName());
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tfStreet.setText(data.getStreet());
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tfCity.setText(data.getCity());
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tfState.setText(data.getState());
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tfZip.setText(data.getZip());
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}
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private StudentAddress getDataFromTextFields() {
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StudentAddress data = new StudentAddress(tfName.getText(), tfStreet.getText(),
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tfCity.getText(), tfState.getText(), tfZip.getText());
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return data;
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}
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public static void main(String[] args) {
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launch(args);
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}
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}

‎Chapter_31/exercise_31_06Client/StudentAddress.java‎

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package exercise_31_06Client;
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import java.io.Serializable;
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public class StudentAddress implements Serializable, StudentAddressConstants {
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private static final long serialVersionUID = 1L;
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private String name;
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private String street;
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private String city;
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private String state;
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private String zip;
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public StudentAddress(String name, String street, String city, String state, String zip) {
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this.name = name;
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this.street = street;
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this.city = city;
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this.state = state;
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this.zip = zip;
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}
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public String getName() {
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return name;
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}
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public String getStreet() {
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return street;
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}
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public String getCity() {
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return city;
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}
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public String getState() {
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return state;
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}
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public String getZip() {
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return zip;
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}
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@Override
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public String toString() {
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return "Name: " + getName() + "\n" + "Street: " + getStreet() + "\n" +
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"City: " + getCity() + "\n" + "State: " + getState() + "\n" + "getZip: " + getZip();
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}
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}

‎Chapter_31/exercise_31_06Client/StudentAddressConstants.java‎

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package exercise_31_06Client;
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public interface StudentAddressConstants {
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public static final int NAME = 32;
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public static final int STREET = 32;
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public static final int CITY = 20;
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public static final int STATE = 4;
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public static final int ZIP = 5;
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public static final int TOTAL = NAME + STREET + CITY + STATE + ZIP;
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public static final int ADD = 1;
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public static final int FIRST = 2;
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public static final int NEXT = 3;
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public static final int PREVIOUS = 4;
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public static final int LAST = 5;
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}

‎Chapter_31/exercise_31_06Server/Exercise_31_06Server.java‎

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package exercise_31_06Server;
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import exercise_31_06Client.StudentAddress;
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import exercise_31_06Client.StudentAddressConstants;
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import java.io.*;
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import java.net.*;
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import java.util.ArrayList;
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public class Exercise_31_06Server implements StudentAddressConstants {
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private ObjectOutputStream outputToClient;
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private ObjectInputStream inputFromClient;
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private ArrayList<StudentAddress> listOfStudentAddresses = new ArrayList<>();
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private int currentIndex = 0;
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private int countOfClients = 0;
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public static void main(String[] args) {
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new Exercise_31_06Server();
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}
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public Exercise_31_06Server() {
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try {
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ServerSocket serverSocket = new ServerSocket(8000);
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System.out.println("Server started!");
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while(countOfClients < 2) {
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Socket socket = serverSocket.accept();
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countOfClients++;
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System.out.println("New client has been connected.");
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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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ex.printStackTrace();
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}
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}
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private class HandleAClient implements Runnable {
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private Socket socket;
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public HandleAClient(Socket socket) {
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this.socket = socket;
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}
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@Override
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public void run() {
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try{
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inputFromClient = new ObjectInputStream(socket.getInputStream());
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outputToClient = new ObjectOutputStream(socket.getOutputStream());
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while(true) {
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int request = inputFromClient.readInt();
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switch(request) {
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case ADD :
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StudentAddress element = (StudentAddress)(inputFromClient.readObject());
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listOfStudentAddresses.add(element);
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currentIndex = 0;
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break;
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case FIRST :
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if(!listOfStudentAddresses.isEmpty()) {
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outputToClient.writeObject(listOfStudentAddresses.get(0));
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currentIndex = 0;
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}
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break;
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case NEXT :
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if(currentIndex < listOfStudentAddresses.size() - 1) {
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outputToClient.writeObject(listOfStudentAddresses.get(++currentIndex));
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}
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break;
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case PREVIOUS :
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if(currentIndex > 0 && !listOfStudentAddresses.isEmpty()) {
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outputToClient.writeObject(listOfStudentAddresses.get(--currentIndex));
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}
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break;
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case LAST :
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if(!listOfStudentAddresses.isEmpty()) {
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currentIndex = listOfStudentAddresses.size() - 1;
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outputToClient.writeObject(listOfStudentAddresses.get(currentIndex));
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}
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break;
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default :
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break;
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}
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for(StudentAddress data : listOfStudentAddresses) {
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System.out.println(data);
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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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catch (ClassNotFoundException ex) {
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ex.printStackTrace();
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}
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finally {
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countOfClients--;
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}
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}
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}
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}

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