laba 2 psp

package LR1.server;

import javax.xml.crypto.Data;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Map;

public class Server implements Runnable {
    private int port;

    public Server(int port) {
        this.port = port;
    }

    public void handleClient(Socket client) {
        String message = null;
        try {
            DataInputStream input = new DataInputStream(client.getInputStream());
            message = input.readUTF();
            System.out.println("Received client's message: " + message);
        } catch (IOException e) {
            System.out.println("Failed to receive client's message");
            e.printStackTrace();
            return;
        }

        String reversed = new StringBuilder(message).reverse().toString();

        try {
            DataOutputStream outputStream = new DataOutputStream(client.getOutputStream());
            outputStream.writeUTF(reversed);

            System.out.println("Sent response: " + reversed);
            System.out.println("Client disconnected.");
            System.out.println();
        } catch (IOException ex) {
            System.out.println("Couldn't send response: ");
            ex.printStackTrace();
            System.out.println();
        }
    }

    @Override
    public void run() {
        ServerSocket server;
        try {
            server = new ServerSocket(this.port);
            System.out.println("Server is running...");
            System.out.println();
        } catch (IOException e) {
            System.out.println("Couldn't start server: ");
            e.printStackTrace();
            return;
        }

        while (true) {
            Socket client = null;
            try {
                client = server.accept();
                handleClient(client);
                client.close();
            } catch (IOException e) {
                System.out.println("Couldn't wait for client's connection: ");
                e.printStackTrace();
            }
        }
    }
}

package LR1.client;

import java.io.*;
import java.net.ConnectException;
import java.net.Socket;

public class Client {
    private static final int port = 8080;

    private static Socket client;
    private static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

    public static void handleMessage(String message) throws IOException {
        DataOutputStream output = new DataOutputStream(client.getOutputStream());
        DataInputStream input = new DataInputStream(client.getInputStream());

        output.writeUTF(message);

        String result = input.readUTF();
        System.out.println("Server response: " + result);
    }

    public static void main(String[] args) throws IOException {
        try {
            client = new Socket("localhost", port);
            System.out.println("Connected");
        } catch (ConnectException ex) {
            System.out.println("Couldn't connect to the server");
            return;
        }

        System.out.print("Enter word: ");
        String message = br.readLine();

        try {
            handleMessage(message);
        } catch (IOException ex) {
            System.out.println("Couldn't send message to server.");
        }

        client.close();
        System.out.println("Connection closed.");
    }
}

package LR1.server;

public class ServerApp {
    private static final int port = 8080;

    public static void main(String[] args) {
        Server server = new Server(port);
        server.run();
    }
}

package LR1.client;

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.AnchorPane;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

import java.io.IOException;

public class ClientApp extends Application {

    private Client client;

    public ClientApp() {
        client = new Client();
    }

    @Override
    public void start(Stage primaryStage) {
        AnchorPane root = new AnchorPane();

        Label ipLabel = new Label("IP");
        ipLabel.setLayoutX(100);
        ipLabel.setLayoutY(10);

        Label portLabel = new Label("port");
        portLabel.setLayoutX(250);
        portLabel.setLayoutY(10);

        TextField ipField = new TextField("127.0.0.1");
        ipField.setLayoutX(20);
        ipField.setLayoutY(40);

        TextField portField = new TextField("8080");
        portField.setPrefWidth(60);
        portField.setLayoutX(240);
        portField.setLayoutY(40);

        TextArea requestText = new TextArea();
        requestText.setPrefColumnCount(30);
        requestText.setPrefRowCount(5);
        requestText.setLayoutX(20);
        requestText.setLayoutY(140);

        TextArea responseText = new TextArea();
        responseText.setPrefColumnCount(30);
        responseText.setPrefRowCount(5);
        responseText.setLayoutX(20);
        responseText.setLayoutY(340);
        responseText.setEditable(false);

        Button sendButton = new Button("Send");
        sendButton.setLayoutX(200);
        sendButton.setLayoutY(260);
        sendButton.setOnAction(actionEvent -> {
            try {
                client.initConnection("127.0.0.1", 8080);
                String response = client.handleMessage(requestText.getText());
                responseText.setText(response);
            } catch (IOException e) {
                e.printStackTrace();
                Alert alert = new Alert(Alert.AlertType.ERROR);
                alert.setContentText(e.getMessage());
            } finally {
                client.closeConnection();
            }
        });

        Label requestLabel = new Label("Request data");
        requestLabel.setLayoutX(180);
        requestLabel.setLayoutY(100);

        Label responseLabel = new Label("Response data");
        responseLabel.setLayoutX(180);
        responseLabel.setLayoutY(300);



        root.getChildren().addAll(
                ipLabel, portLabel,
                ipField, portField,
                requestLabel,
                requestText,
                sendButton,
                responseLabel,
                responseText
        );



        final Scene scene = new Scene(root, 410, 500);
        requestText.requestFocus();
        primaryStage.setTitle("Server client");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    public static void main(final String[] arguments) {
        launch(arguments);
    }}