JavaFX 和 FXML：在场景、舞台之间传递连接 [重复]

Question

HI 真的需要帮助来完成这项任务。如何将连接从我的登录窗口传递到我的主窗口。我有一个登录窗口，我要求用户选择服务器类型（例如：MySQL、SQL、MySQL Local）、用户类型（例如：Parent、Admin、Student）、数据库名称（他们要连接的数据库的名称to)、服务器名称 (root) 和服务器密码。如果所有信息都正确，那么它将打开主窗口。现在我将该 sql 连接传递到我的主窗口，以便我可以编写代码以将数据从我的数据库加载到我的表中。

所有需要帮助的只是传递连接到我的其他班级或场景，舞台。这将在 3 天内到期。如果您需要 FXML 代码，我也可以发送它们。拜托，拜托我真的需要帮助才能通过连接

这是我的连接代码

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Enumeration;
import java.util.Scanner;
import javafx.scene.control.Alert;


public class Connections {

private static Alert al;

public static final int MYSQLLOCAL = 1;
public static final int MYSQLREMOTE= 2;
public static final int SQLSERVERLOCAL = 3;
public static final int SQLSERVER = 4;
public static final int UNKNOWN = -1;


public static java.sql.Connection getconnect(int which, String name, String uid, String pass) {
    Scanner scan = new Scanner(System.in);
    java.sql.Connection connection = null;

    String driver = getDriver(which);
    String url = getURL(which, name);
    System.out.println(driver);
    System.out.println(url);
    try
    { // load the driver
            Class.forName(driver).newInstance();
            System.out.println("Known drivers that are registered:");
            Enumeration enumer = DriverManager.getDrivers();
            while (enumer.hasMoreElements())
                    System.out.println(enumer.nextElement());
    }
    catch( ClassNotFoundException | InstantiationException | IllegalAccessException e )
    { 
        return null;
    }
    try
    {
        connection = DriverManager.getConnection(url, uid, pass);
        System.out.println("Connection pass");
    }
    catch(Exception e )
    {
        return null;
    }
    return connection;

    }

 public static Connection connect(int which, String name) {
    java.sql.Connection connection = null;
    String driver = getDriver(which);
    String url = getURL(which, name);
    System.out.println(driver);
    System.out.println(url);
    try { // load the driver
            Class.forName(driver).newInstance();
            System.out.println("Known drivers that are registered:");
            Enumeration enumer = DriverManager.getDrivers();
            while (enumer.hasMoreElements())
                    System.out.println(enumer.nextElement());
    }
    catch( ClassNotFoundException | InstantiationException | IllegalAccessException e )
    { 
    return null;
    }

    try {
        connection = DriverManager.getConnection(url, "", "");
        System.out.println("Connection successful!");

    }
    catch( SQLException e )
    {   
    al = new Alert(Alert.AlertType.INFORMATION);
    al.setTitle("Error");
    al.setHeaderText(null);
    al.setContentText("Login failed. Please make sure all information"
            + " are correct");
    al.showAndWait();

    return null;
    }
    return connection;
 }

public static String getDriver(int num) {
    switch (num) {
    case SQLSERVER:
            return "com.microsoft.sqlserver.jdbc.SQLServerDriver";
    case MYSQLLOCAL:
            return "com.mysql.jdbc.Driver";
    case MYSQLREMOTE:
            return "com.mysql.jdbc.Driver";
    case SQLSERVERLOCAL:
            return "com.microsoft.sqlserver.jdbc.SQLServerDriver";
    default:
            return "error";
    }
}
public static String getURL(int num, String names) {
    Scanner scan = new Scanner(System.in);
    String name = names;
    switch (num) {
        case SQLSERVER:
        {
            if (name.equals("default"))
                    return "jdbc:sqlserver://164.106.3.23:9012";
            else
                    return "jdbc:sqlserver://164.106.3.23:9012" + "; databaseName=" + name;
            // change this to match your ODBC connection name
        }
        case MYSQLLOCAL:
        {
            return "jdbc:mysql://localhost:3306/"+name;
        }
        case MYSQLREMOTE:
        {
            return "jdbc:mysql://164.106.3.22:3098/"+ name;
        }
        default:
            return "error";
    }
}
}

这是我用于登录的 FXML 控制器

import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Statement;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.Event;
import javafx.fxml.*;
import javafx.scene.*;
import javafx.scene.control.*;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.Pane;
import javafx.stage.Stage;

public class GiantsLoginController {

public String dataName, serverName, password;
public int num;

private Connection connect = null;
private Statement stmt = null;

private boolean userPass, connected;

private Connections connection;


@FXML
private ComboBox<String> sType;
@FXML
public TextField dbName;
@FXML
private TextField sName;
@FXML
private Button loginB;
@FXML
private PasswordField sPassword;
@FXML
private Pane paneL;
@FXML
private GridPane gPane;
@FXML
private ComboBox<String> uType;


ObservableList<String> sLists = FXCollections.observableArrayList("MySQL LOCAL", 
        "MYSQL REMOTE", "SQL SERVER LOCAL", "SQL SERVER");
ObservableList<String> uList = FXCollections.observableArrayList("Player", 
        "Admin");



@FXML
public void initialize() {
    sType.setItems(sLists);
    uType.setItems(uList);
}

@FXML
public void loginBClick (Event event) {
    if (isAllFieldFillup()) {

        switch(uType.getValue().trim()) {
            case "Admin":
                if (connectCheck()) {
                    try {
                        Parent giantsAdmin = FXMLLoader.load(getClass().getResource("GiantsAdmin.fxml"));                      
                        Scene gAdminScene = new Scene(giantsAdmin);
                        Stage gAdminStage = (Stage) ((Node) event.getSource()).getScene().getWindow();
                        gAdminStage.hide();
                        gAdminStage.setScene(gAdminScene); 
                        gAdminStage.setTitle("Giants Admin");
                        gAdminStage.getScene().getStylesheets().add(getClass().getResource("style.css").toExternalForm());
                        gAdminStage.show();
                    }
                    catch (Exception e) {

                    }
                }
            case "Player": 
                if (connectCheck()) {
                    try {
                        Parent giantsPlayer = FXMLLoader.load(getClass().getResource("GiantsPlayer.fxml"));
                        Scene gPlayerScene = new Scene(giantsPlayer);
                        Stage gPlayerStage = (Stage) ((Node) event.getSource()).getScene().getWindow();
                        gPlayerStage.hide();
                        gPlayerStage.setScene(gPlayerScene);
                        gPlayerStage.setTitle("Giants Playe");
                        gPlayerStage.getScene().getStylesheets().add(getClass().getResource("style.css").toExternalForm());
                        gPlayerStage.show();
                    }
                    catch (Exception e) {

                    }
                }
        }
    }
}

public void closeConnection () {

    if (connect != null) {
        try {
            stmt.close();
            connect.close();
        }
        catch (SQLException e) {

        }
    }
}

public boolean connectCheck() {
    connected = false;

    dataName = dbName.getText();
    serverName = sName.getText();
    password = sPassword.getText();


    switch (sType.getValue()) {
        case "MySQL LOCAL":
            num = 1;
            break;
        case "MYSQL REMOTE":
            num = 2;
            break;
        case "SQL SERVER LOCAL":
            num = 3;
            break;
        case "SQL SERVER":
            num = 4;
            break;
        default:

    }

    if (connect == null) {
        connect = Connections.getconnect(num, dataName, serverName, password);
    }

    if (connect == null ) {
        System.out.println("Still no connection");
    }

    if (stmt == null) {
        try {
            stmt = connect.createStatement();
            connected = true;
        } catch (SQLException e) {
            Alert notify = new Alert(Alert.AlertType.INFORMATION);
            notify.setTitle("Blank filed");
            notify.setHeaderText(null);
            notify.setContentText("Incorrect login.");
            notify.showAndWait();

            connected = false;
        }


    }
    return connected;
}

private boolean isAllFieldFillup() {
    boolean allInfo;
    if (sType.getValue().equals("server type") && dbName.getText().isEmpty()
            && sName.getText().isEmpty() && sPassword.getText().isEmpty()) {
        Alert notify = new Alert(Alert.AlertType.INFORMATION);
        notify.setTitle("Blank filed");
        notify.setHeaderText(null);
        notify.setContentText("You are missing some information.");
        notify.showAndWait();

        allInfo = false;
    }
    else {
        allInfo = true;
    }
    return allInfo;
}

}

这是我的这里是我有表格的主窗口的控制器

import java.io.IOException;
import java.sql.Statement;
import javafx.collections.*;
import javafx.event.Event;
import javafx.fxml.*;
import javafx.scene.Node;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.stage.Stage;

public class GiantsAdminController {
@FXML
private Button connect = null;
private boolean connected;

private Statement stmt;

@FXML
private TextField aRank;
@FXML
private TextField aName;
@FXML
private TextField aPosition;
@FXML
private TextField aSchool;
@FXML
private TextField aAge;
@FXML
private TextField aWar;
@FXML
private Button clearB;
@FXML
private Button addB;
@FXML
private TableColumn<?, ?> rank;
@FXML
private TableColumn<?, ?> name;
@FXML
private TableColumn<?, ?> position;
@FXML
private TableColumn<?, ?> school;
@FXML
private TableColumn<?, ?> age;
@FXML
private TableColumn<?, ?> war;
@FXML
private TextField qSearch;
@FXML
private Button search;
@FXML
private Button singout;
@FXML
private Button delete;
@FXML
private ComboBox<String> serverType;
@FXML
private TextField dbName;
@FXML
private TextField serverName;
@FXML
private TextField sPassword;

ObservableList<String> sLists = FXCollections.observableArrayList("MySQL LOCAL", 
        "MYSQL REMOTE", "SQL SERVER LOCAL", "SQL SERVER");
@FXML
public void initialize() {
    serverType.setItems(sLists);
}

@FXML
public void clearBClick (Event event) {
    aRank.clear();
    aName.clear();
    aPosition.clear();
    aSchool.clear();
    aAge.clear();
    aWar.clear();
}




@FXML
public void SingOutClick(Event event) throws IOException {


    ((Node)event.getSource()).getScene().getWindow().hide();
    Stage stage = new Stage();
    //stage.hide();
    Parent giantsLogin = FXMLLoader.load(getClass().getResource("/giants/GiantsLogin.fxml"));

    Scene gLScene = new Scene(giantsLogin);
    gLScene.getStylesheets().add(getClass().getResource("style.css").toExternalForm());
    stage.setScene(gLScene); 
    stage.show();
 }

}

Answer 1

在您的控制器中实现一个方法，您可以在其中设置相应的阶段，例如public void setMain(Stage main){}; 然后试试：

FXMLLoader loader = new FXMLLoader(getClass().getResource("Style.fxml"));
Parent root = loader.load();
YourController cc = loader.getController();
cc.setMain(primaryStage);

如果你实例化加载器而不是使用静态方法

Parent root = FXMLLoader.load("Style.fxml");

您可以访问您的控制器，通过您的主舞台，从而访问您的控制器内的舞台。