JavaFX、FXML 第二场景打不开答案

【问题标题】：JavaFX, FXML Second scene is not openingJavaFX、FXML 第二场景打不开
【发布时间】：2016-11-26 05:05:14
【问题描述】：

我需要有关此 java 代码的帮助。我有三个场景登录场景、管理员场景和玩家场景。当我运行程序并输入该用户和密码时，第二个应该打开。现在的问题是，第二个场景没有打开。它甚至连接到数据库，但第二个场景没有打开。我已经检查了代码，我看不出它有什么问题。有人可以帮助我，发生了什么。

这是我的主要代码。

import java.io.IOException;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

public class GiantsLogin extends Application {

private static Stage stage;

@Override
public void start(Stage stage) throws IOException {
    setPrimaryStage(stage);
    Parent root = FXMLLoader.load(getClass().getResource("GiantsLogin.fxml"));
    Scene scene = new Scene(root);
    scene.getStylesheets().add(getClass().getResource("style.css").toExternalForm());
    stage.setScene(scene);
    stage.setTitle("Giants Login");
    stage.show();
}

public static void setPrimaryStage(Stage primaryStage) {
    stage = primaryStage;
}

public static Stage getPrimaryStage() {
    return stage;
}

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

}

这是我的主控制器：

import java.io.IOException;
import java.sql.*;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.Event;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.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 {

                          admindStage(GiantsLogin.getPrimaryStage());

                    }
                    catch (Exception e) {

                    }
                }
            case "Player": 
                if (connectCheck()) {
                    try {
                        playerStage(GiantsLogin.getPrimaryStage());

                    }
                    catch (Exception e) {

                    }
                }
        }
    }
}

public void admindStage(Stage stage) throws IOException {
    GiantsAdminController controller = new GiantsAdminController("Hello World!");
    FXMLLoader loader = new FXMLLoader (getClass().getResource("GiantsAdmin.fxml"));
    loader.setController(controller);
    stage.hide();
    stage.setScene(new Scene((Pane) loader.load()));
    stage.show();
}

public void playerStage(Stage stage) throws IOException {
    GiantsAdminController controller = new GiantsAdminController("Hello World!");
    FXMLLoader loader = new FXMLLoader(getClass().getResource("GiantsPlayer.fxml"));
    loader.setController(controller);
    stage.hide();
    stage.setScene(new Scene((Pane) loader.load()));
    stage.show();
}

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;
}

}

这是我为我的管理员和玩家场景搭建舞台的地方。

public void admindStage(Stage stage) throws IOException {
    GiantsAdminController controller = new GiantsAdminController("Hello World!");
    FXMLLoader loader = new FXMLLoader (getClass().getResource("GiantsAdmin.fxml"));
    loader.setController(controller);
    stage.hide();
    stage.setScene(new Scene((Pane) loader.load()));
    stage.show();
}

public void playerStage(Stage stage) throws IOException {
    GiantsAdminController controller = new GiantsAdminController("Hello World!");
    FXMLLoader loader = new FXMLLoader(getClass().getResource("GiantsPlayer.fxml"));
    loader.setController(controller);
    stage.hide();
    stage.setScene(new Scene((Pane) loader.load()));
    stage.show();
}

这就是我在 GiantsLoginController 中调用这两个阶段的地方。

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

        switch(uType.getValue().trim()) {
            case "Admin":
                if (connectCheck()) {
                    try {

                          admindStage(GiantsLogin.getPrimaryStage());

                    }
                    catch (Exception e) {

                    }
                }
            case "Player": 
                if (connectCheck()) {
                    try {
                        playerStage(GiantsLogin.getPrimaryStage());

                    }
                    catch (Exception e) {

                    }
                }
        }
    }
}

这是我的管理场景的控制器

import java.io.IOException;
import java.net.URL;
import java.sql.Statement;
import java.util.ResourceBundle;
import javafx.collections.*;
import javafx.event.Event;
import javafx.fxml.*;
import javafx.scene.*;
import javafx.scene.control.*;
import javafx.stage.Stage;

public class GiantsAdminController implements Initializable {
@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;

public GiantsAdminController(String message) {
    System.out.println("You said: " + message);
}

public GiantsAdminController() {
}

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 {


    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();
}

@Override
public void initialize(URL location, ResourceBundle resources) {//To change body of generated methods, choose Tools | Templates.
}

【问题讨论】：

请学习如何使用调试器。如果没有可用的完整代码/设置，很难为您提供帮助。另一方面，您可以简单地通过代码来识别问题，这不会花费一分钟。使用空的 catch 块绝不是一个好主意，除非您的代码将继续正常工作，即使发生异常也是如此。即使在大多数情况下，在某处记录信息也是一个好主意。尤其是在您正在寻找的情况下错误的例外可以提供有价值的信息。btw：选择 Admin是故意尝试使用播放器和管理员场景的错误吗？

标签： javafx fxml netbeans-8

【解决方案1】：

以下只是一个命题！。使用admindStage()方法，进行如下修改

 public void admindStage(Stage stage) throws IOException {
    GiantsAdminController controller = new GiantsAdminController("Hello World!");
    FXMLLoader loader = new FXMLLoader (getClass().getResource("GiantsAdmin.fxml"));
    loader.setController(controller);
    //stage.hide();
    stage.setScene(new Scene((Pane) loader.load()));
    //stage.show();
}

或使用多个阶段：

public void admindStage() throws IOException {
    GiantsAdminController controller = new GiantsAdminController("Hello World!");
    FXMLLoader loader = new FXMLLoader (getClass().getResource("GiantsAdmin.fxml"));
    loader.setController(controller);
    Stage stage = new Stage();
    stage.setScene(new Scene((Pane) loader.load()));
    stage.show();
}

【讨论】：