Added a login page and made connection with database.

Author: chaoticReason

.gitignore

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+# Created by .ignore support plugin (hsz.mobi)
+### Example user template template
+### Example user template
+
+# IntelliJ project files
+.idea
+*.iml
+out
+gen

README.md

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+#**Task and bug tracking system**
+
+Login page is half-ready now.
+
+#### Developed with
+
+Java 14, JavaFX 15, MySQL 8
+
+
+#### How to
+
+1) Download **Java**.
+
+2) Download **IntelliJ**.
+
+3) Download **JavaFX**. 
+Here is a tutorial https://www.jetbrains.com/help/idea/javafx.html#add-javafx-lib .
+
+4) Download  **MySQL**. Don't forget 
+about **Java Driver**,
+so you can connect to database.
+
+5) Download **SceneBuilder** 
+which is a drag and drop UI designer tool
+that generates FXML.
+
+6) Add src folder to libraries in Project Structure...
+(that helped to fix problem "TaskTrackingApp module is not found").
+
+7) Create a MySQL server. Then create a database called dbts. I used DataGrips with student licension.
+
+8) Install a plugin **Database Navigator** in IntelliJ. 
+Use the plugin to connect with database. 
+In class DatabaseConnection edit database name, 
+url, user, password.
+
+

SQL scripts/scriptUsers.sql

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+CREATE DATABASE dbts;
+
+USE dbts;
+
+CREATE TABLE users
+(
+    id              INT unsigned NOT NULL AUTO_INCREMENT,
+    email           VARCHAR(150) NOT NULL,
+    name            VARCHAR(150) NOT NULL,
+    surname         VARCHAR(150),
+    password        VARCHAR(150) NOT NULL,
+    PRIMARY KEY     (id)
+);
+
+INSERT INTO users ( email, name, surname, password) VALUES
+  ( 'nastya@gmail.com', 'Анастасия', 'Сибирская', 'Sibir1sky' );

src/module-info.java

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+module TaskTrackingApp {
+    requires javafx.graphics;
+    requires javafx.fxml;
+    requires javafx.controls;
+    requires java.sql;
+    requires mysql.connector.java;
+
+    opens sample;
+}

src/sample/DatabaseConnection.java

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+package sample;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+
+public class DatabaseConnection {
+    private Connection dbLink;
+
+    public Connection getConnection(){
+        String dbName = "dbts"; //DataBase Tracking System
+        String dbUser = "root";
+        String dbPassword = "root";
+        String url = "jdbc:mysql://localhost:3306/" + dbName;
+
+        try{
+            Class.forName("com.mysql.cj.jdbc.Driver");
+            dbLink = DriverManager.getConnection(url, dbUser, dbPassword);
+        }catch(Exception e){
+            e.printStackTrace();
+            e.getCause();
+        }
+
+        return dbLink;
+    }
+
+    public Connection getLink() {
+        return dbLink;
+    }
+}

src/sample/LoginController.java

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+package sample;
+
+import javafx.fxml.FXML;
+import javafx.fxml.Initializable;
+import javafx.scene.control.Button;
+import javafx.scene.control.Label;
+import javafx.scene.control.TextField;
+import javafx.scene.image.Image;
+import javafx.scene.image.ImageView;
+import javafx.stage.Stage;
+
+import java.io.File;
+import java.net.URL;
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.ResultSet;
+import java.sql.Statement;
+import java.util.ResourceBundle;
+
+import util.MyChecker;
+
+public class LoginController implements Initializable {
+    @FXML
+    private TextField loginField;
+
+    @FXML
+    private Label invalidLoginLabel;
+
+    @FXML
+    private Button continueButton;
+
+    @FXML
+    private Button cancelButton;
+
+    @FXML
+    private ImageView leftImage;
+
+    public void onContinue(){
+        if(loginField.getText().isBlank()){
+            invalidLoginLabel.setText("Введите почту");
+        }
+        else if( !MyChecker.isEmail( loginField.getText() ) ){
+            invalidLoginLabel.setText("Не является почтой или содержит недопустимые символы. \nВводите в формате email@box.any с -._");
+        }
+        else if (!validateEmail()){
+            invalidLoginLabel.setText("Почта не найдена. \nПроверьте правильность или зарегистрируйтесь");
+        }
+        else{
+            invalidLoginLabel.setText("Продолжение следует...");
+        }
+    }
+
+    public void onCancel(){
+        Stage stage = (Stage) cancelButton.getScene().getWindow(); // could be better code here
+        stage.close();
+    }
+
+    @Override
+    public void initialize(URL url, ResourceBundle resourceBundle) {
+        File file1 = new File("images/0.png"); //no picture now
+        Image image1 = new Image(file1.toURI().toString());
+        leftImage.setImage(image1);
+    }
+
+    private boolean validateEmail(){
+        DatabaseConnection toolDB = new DatabaseConnection();
+        Connection toDB = toolDB.getConnection();
+
+        String verifyLogin = "SELECT count(1) FROM users WHERE email = '" + loginField.getText() + "';";
+
+        try{
+            Statement statement = toDB.createStatement();
+            ResultSet queryResult = statement.executeQuery(verifyLogin);
+
+            while(queryResult.next()){
+                if(queryResult.getInt(1) == 1){
+                    return true;
+                } else {
+                    return false;
+                }
+            }
+
+        }catch(Exception e){
+            e.printStackTrace();
+            e.getCause();
+        }
+
+        return false;
+    }
+}

src/sample/Main.java

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+package sample;
+
+import javafx.application.Application;
+import javafx.fxml.FXMLLoader;
+import javafx.scene.Parent;
+import javafx.scene.Scene;
+import javafx.stage.Stage;
+import javafx.stage.StageStyle;
+
+public class Main extends Application {
+
+    @Override
+    public void start(Stage primaryStage) throws Exception{
+        Parent root = FXMLLoader.load(getClass().getResource("login.fxml"));
+        primaryStage.initStyle(StageStyle.UNDECORATED);
+        primaryStage.setTitle("Hello World");
+        primaryStage.setScene(new Scene(root));
+        primaryStage.show();
+    }
+
+
+    public static void main(String[] args) {
+        launch(args);
+    }
+}

src/sample/login.fxml

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+<?xml version="1.0" encoding="UTF-8"?>
+
+<?import javafx.scene.control.*?>
+<?import javafx.scene.image.*?>
+<?import javafx.scene.layout.*?>
+
+<BorderPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="520.0" xmlns="http://javafx.com/javafx/11.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.LoginController">
+   <left>
+      <AnchorPane prefHeight="400.0" prefWidth="200.0" BorderPane.alignment="CENTER_LEFT">
+         <children>
+            <ImageView fx:id="leftImage" fitHeight="400.0" fitWidth="200.0" layoutX="-1.0" pickOnBounds="true" preserveRatio="true" />
+         </children></AnchorPane>
+   </left>
+   <right>
+      <AnchorPane prefWidth="320.0" BorderPane.alignment="CENTER_RIGHT">
+         <children>
+            <Label layoutX="55.0" layoutY="159.0" text="Почта" />
+            <TextField fx:id="loginField" layoutX="55.0" layoutY="187.0" promptText="email@box.any" />
+            <Button fx:id="continueButton" layoutX="55.0" layoutY="273.0" mnemonicParsing="false" onAction="#onContinue" prefHeight="27.0" prefWidth="125.0" text="Продолжить" />
+            <Button fx:id="cancelButton" layoutX="55.0" layoutY="311.0" mnemonicParsing="false" onAction="#onCancel" prefHeight="27.0" prefWidth="125.0" text="Отмена" />
+            <Label fx:id="invalidLoginLabel" layoutX="55.0" layoutY="214.0" prefHeight="27.0" prefWidth="157.0" text="Пользователь не найден" />
+         </children></AnchorPane>
+   </right>
+</BorderPane>

src/util/MyChecker.java

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+package util;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class MyChecker {
+    private static final String regex = "^[A-Za-z0-9+_.-]+@[A-Za-z0-9.-]+$";
+
+    public static boolean isEmail(String email){
+        Pattern pattern = Pattern.compile(regex);
+        Matcher matcher = pattern.matcher(email);
+        return matcher.matches();
+    }
+
+}