Java example of SSL Server and Client, and how to generate keystore

Here are examples of Java SSL Server and Client.

JavaSSLServer.java

package javasslserver;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.net.ssl.SSLServerSocketFactory;

/**
 * @web http://java-buddy.blogspot.com/
 */
public class JavaSSLServer {
    
    static final int port = 8000;

    public static void main(String[] args) {
        
        
        SSLServerSocketFactory sslServerSocketFactory = 
                (SSLServerSocketFactory)SSLServerSocketFactory.getDefault();
        
        try {
            ServerSocket sslServerSocket = 
                    sslServerSocketFactory.createServerSocket(port);
            System.out.println("SSL ServerSocket started");
            System.out.println(sslServerSocket.toString());
            
            Socket socket = sslServerSocket.accept();
            System.out.println("ServerSocket accepted");
            
            PrintWriter out = new PrintWriter(socket.getOutputStream(), true);
            try (BufferedReader bufferedReader = 
                    new BufferedReader(
                            new InputStreamReader(socket.getInputStream()))) {
                String line;
                while((line = bufferedReader.readLine()) != null){
                    System.out.println(line);
                    out.println(line);
                }
            }
            System.out.println("Closed");
            
        } catch (IOException ex) {
            Logger.getLogger(JavaSSLServer.class.getName())
                    .log(Level.SEVERE, null, ex);
        }
    }
    
}

JavaSSLClient.java

package javasslclient;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import java.util.Scanner;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.net.ssl.SSLSocketFactory;

/**
 * @web http://java-buddy.blogspot.com/
 */
public class JavaSSLClient {
    
    static final int port = 8000;

    public static void main(String[] args) {
        
        SSLSocketFactory sslSocketFactory = 
                (SSLSocketFactory)SSLSocketFactory.getDefault();
        try {
            Socket socket = sslSocketFactory.createSocket("localhost", port);
            PrintWriter out = new PrintWriter(socket.getOutputStream(), true);
            try (BufferedReader bufferedReader = 
                    new BufferedReader(
                            new InputStreamReader(socket.getInputStream()))) {
                Scanner scanner = new Scanner(System.in);
                while(true){
                    System.out.println("Enter something:");
                    String inputLine = scanner.nextLine();
                    if(inputLine.equals("q")){
                        break;
                    }
                    
                    out.println(inputLine);
                    System.out.println(bufferedReader.readLine());
                }
            }
            
        } catch (IOException ex) {
            Logger.getLogger(JavaSSLClient.class.getName())
                    .log(Level.SEVERE, null, ex);
        }
         
    }
    
}

Without keystore, both the server and client will fail. This video show how to generate keystore using keytool program. Then run server and client with keystore and password.


Type the following command in your command window to create a keystore named examplestore and to generate keys:

$ keytool -genkey -alias signFiles -keystore examplestore

You will be prompted to enter passwords for the key and keystore. The password in this example is "password".

(reference: https://docs.oracle.com/javase/tutorial/security/toolsign/step3.html)

Run SSL server and client by entering the commands:
$ java -jar -Djavax.net.ssl.keyStore=keystore -Djavax.net.ssl.keyStorePassword=password "...JavaSSLServer.jar"
$ java -jar -Djavax.net.ssl.trustStore=keystore -Djavax.net.ssl.trustStorePassword=password "...JavaSSLClient.jar"

Read csv, run in background thread and update JavaFX TableView dynamically

It's modified version of last example "Read csv file, display in JavaFX TableView", with the job run in background thread. I also add dummy delay to simulate long time operation in background thread.

JavaFXCSVTableView.java

package javafxcsvtableview;

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javafx.application.Application;
import javafx.application.Platform;
import javafx.beans.property.SimpleStringProperty;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

/**
 * @web http://java-buddy.blogspot.com/
 */
public class JavaFXCSVTableView extends Application {

    public class Record {
        //Assume each record have 6 elements, all String

        private SimpleStringProperty f1, f2, f3, f4, f5, f6;

        public String getF1() {
            return f1.get();
        }

        public String getF2() {
            return f2.get();
        }

        public String getF3() {
            return f3.get();
        }

        public String getF4() {
            return f4.get();
        }

        public String getF5() {
            return f5.get();
        }

        public String getF6() {
            return f6.get();
        }

        Record(String f1, String f2, String f3, String f4,
                String f5, String f6) {
            this.f1 = new SimpleStringProperty(f1);
            this.f2 = new SimpleStringProperty(f2);
            this.f3 = new SimpleStringProperty(f3);
            this.f4 = new SimpleStringProperty(f4);
            this.f5 = new SimpleStringProperty(f5);
            this.f6 = new SimpleStringProperty(f6);
        }

    }

    private final TableView<Record> tableView = new TableView<>();

    private final ObservableList<Record> dataList
            = FXCollections.observableArrayList();

    @Override
    public void start(Stage primaryStage) {
        primaryStage.setTitle("java-buddy.blogspot.com");

        Group root = new Group();

        TableColumn columnF1 = new TableColumn("f1");
        columnF1.setCellValueFactory(
                new PropertyValueFactory<>("f1"));

        TableColumn columnF2 = new TableColumn("f2");
        columnF2.setCellValueFactory(
                new PropertyValueFactory<>("f2"));

        TableColumn columnF3 = new TableColumn("f3");
        columnF3.setCellValueFactory(
                new PropertyValueFactory<>("f3"));

        TableColumn columnF4 = new TableColumn("f4");
        columnF4.setCellValueFactory(
                new PropertyValueFactory<>("f4"));

        TableColumn columnF5 = new TableColumn("f5");
        columnF5.setCellValueFactory(
                new PropertyValueFactory<>("f5"));

        TableColumn columnF6 = new TableColumn("f6");
        columnF6.setCellValueFactory(
                new PropertyValueFactory<>("f6"));

        tableView.setItems(dataList);
        tableView.getColumns().addAll(
                columnF1, columnF2, columnF3, columnF4, columnF5, columnF6);

        VBox vBox = new VBox();
        vBox.setSpacing(10);
        vBox.getChildren().add(tableView);

        root.getChildren().add(vBox);

        primaryStage.setScene(new Scene(root, 700, 250));
        primaryStage.show();

        //readCSV();
        
        //run in background thread
        new Thread() {
            
            @Override
            public void run() {
                readCSV();
            };
            
        }.start();
        
    }

    private void readCSV() {
        
        System.out.println("Platform.isFxApplicationThread(): "
                        + Platform.isFxApplicationThread());

        String CsvFile = "/home/buddy/test/test.csv";
        String FieldDelimiter = ",";

        BufferedReader br;

        try {
            br = new BufferedReader(new FileReader(CsvFile));

            String line;
            while ((line = br.readLine()) != null) {
                String[] fields = line.split(FieldDelimiter, -1);

                Record record = new Record(fields[0], fields[1], fields[2],
                        fields[3], fields[4], fields[5]);
                dataList.add(record);

                //Add delay to simulate long time operation
                try {
                    Thread.sleep(2000);
                } catch (InterruptedException ex) {
                    Logger.getLogger(JavaFXCSVTableView.class.getName())
                            .log(Level.SEVERE, null, ex);
                }
            }

        } catch (FileNotFoundException ex) {
            Logger.getLogger(JavaFXCSVTableView.class.getName())
                    .log(Level.SEVERE, null, ex);
        } catch (IOException ex) {
            Logger.getLogger(JavaFXCSVTableView.class.getName())
                    .log(Level.SEVERE, null, ex);
        }

    }

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

}

Read csv file, display in JavaFX TableView

Java example read csv file and display the content in JavaFX TableView.

To know how to prepare the csv file, and simple read csv file, refer to last post.

JavaFXCSVTableView.java

package javafxcsvtableview;

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javafx.application.Application;
import javafx.beans.property.SimpleStringProperty;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

/**
 * @web http://java-buddy.blogspot.com/
 */
public class JavaFXCSVTableView extends Application {

    public class Record {
        //Assume each record have 6 elements, all String

        private SimpleStringProperty f1, f2, f3, f4, f5, f6;

        public String getF1() {
            return f1.get();
        }

        public String getF2() {
            return f2.get();
        }

        public String getF3() {
            return f3.get();
        }

        public String getF4() {
            return f4.get();
        }

        public String getF5() {
            return f5.get();
        }

        public String getF6() {
            return f6.get();
        }

        Record(String f1, String f2, String f3, String f4,
                String f5, String f6) {
            this.f1 = new SimpleStringProperty(f1);
            this.f2 = new SimpleStringProperty(f2);
            this.f3 = new SimpleStringProperty(f3);
            this.f4 = new SimpleStringProperty(f4);
            this.f5 = new SimpleStringProperty(f5);
            this.f6 = new SimpleStringProperty(f6);
        }

    }

    private final TableView<Record> tableView = new TableView<>();

    private final ObservableList<Record> dataList
            = FXCollections.observableArrayList();

    @Override
    public void start(Stage primaryStage) {
        primaryStage.setTitle("java-buddy.blogspot.com");

        Group root = new Group();

        TableColumn columnF1 = new TableColumn("f1");
        columnF1.setCellValueFactory(
                new PropertyValueFactory<>("f1"));

        TableColumn columnF2 = new TableColumn("f2");
        columnF2.setCellValueFactory(
                new PropertyValueFactory<>("f2"));

        TableColumn columnF3 = new TableColumn("f3");
        columnF3.setCellValueFactory(
                new PropertyValueFactory<>("f3"));

        TableColumn columnF4 = new TableColumn("f4");
        columnF4.setCellValueFactory(
                new PropertyValueFactory<>("f4"));

        TableColumn columnF5 = new TableColumn("f5");
        columnF5.setCellValueFactory(
                new PropertyValueFactory<>("f5"));

        TableColumn columnF6 = new TableColumn("f6");
        columnF6.setCellValueFactory(
                new PropertyValueFactory<>("f6"));

        tableView.setItems(dataList);
        tableView.getColumns().addAll(
                columnF1, columnF2, columnF3, columnF4, columnF5, columnF6);

        VBox vBox = new VBox();
        vBox.setSpacing(10);
        vBox.getChildren().add(tableView);

        root.getChildren().add(vBox);

        primaryStage.setScene(new Scene(root, 700, 250));
        primaryStage.show();

        readCSV();
    }

    private void readCSV() {

        String CsvFile = "/home/buddy/test/test.csv";
        String FieldDelimiter = ",";

        BufferedReader br;

        try {
            br = new BufferedReader(new FileReader(CsvFile));

            String line;
            while ((line = br.readLine()) != null) {
                String[] fields = line.split(FieldDelimiter, -1);

                Record record = new Record(fields[0], fields[1], fields[2],
                        fields[3], fields[4], fields[5]);
                dataList.add(record);

            }

        } catch (FileNotFoundException ex) {
            Logger.getLogger(JavaFXCSVTableView.class.getName())
                    .log(Level.SEVERE, null, ex);
        } catch (IOException ex) {
            Logger.getLogger(JavaFXCSVTableView.class.getName())
                    .log(Level.SEVERE, null, ex);
        }

    }

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

}

Next post show how to do the job in background.