如何在Java FX中将值从一个页面传递到另一个页面 [英] How can i pass value from one page to another in Java FX

问题描述

有人可以建议，我们如何将值从一个控制器传递到另一个控制器。
我的场景在下面

登录后我需要在我的主页上获取用户名。
请分享这段代码。

提前致谢!!!

解决方案

正如我从您的问题中所理解的那样，您需要一个登录屏幕，然后需要连续的其他屏幕进行导航。第一个用户必须登录，验证后，用户信息将进入主屏幕。以下是可能对您有帮助的代码 -

Main.java

 包裹样本; 
 import javafx.application.Application; 
 import javafx.stage.Stage; 
 
公共类Main扩展Application {
 
 @Override 
 public void start（Stage primaryStage）throws Exception {
 LoginController loginController = new LoginController（）; 
 loginController.launchLogingController（primaryStage）; 
} 
 
 
 public static void main（String [] args）{
 launch（args）; 
} 
} 
  

LoginController.java

  package sample; 
 import javafx.event.ActionEvent; 
 import javafx.fxml.FXML; 
 import javafx.fxml.FXMLLoader; 
 import javafx.scene.Parent; 
 import javafx.scene.Scene; 
 import javafx.scene.control.TextField; 
 import javafx.stage.Stage; 
 
 import java.io.IOException; 
 
 
公共类LoginController {
 
私人父母; 
私密场景场景; 
私人舞台舞台; 
 @FXML 
 private TextField userName; 
 @FXML 
 private TextField passwordField; 
 
私人家庭控制器homeController; 
 
 public LoginController（）{
 FXMLLoader fxmlLoader = new FXMLLoader（getClass（）。getResource（/ fxml / login.fxml））; 
 fxmlLoader.setController（this）; 
 try {
 parent =（Parent）fxmlLoader.load（）; 
 scene = new Scene（parent，600,400）; 
} catch（IOException e）{
 e.printStackTrace（）; 
} 
} 
 
 @FXML 
 protected void handleSubmitButtonAction（ActionEvent event）{
 System.out.println（userName.getText（））; 
 if（userName.getText（）。trim（）。length（）> 0&& passwordField.getText（）。trim（）。length（）> 0）{
 homeController =新的HomeController（）; 
 homeController.redirectHome（stage，userName.getText（）。trim（））; 
} 
 
} 
 
 public void launchLogingController（阶段阶段）{
 this.stage = stage; 
 stage.setTitle（用户登录）; 
 stage.setScene（场景）; 
 stage.setResizable（true）; 
 stage.hide（）; 
 stage.show（）; 
} 
} 
  

HomeController.java

  package sample; 
 import javafx.fxml.FXML; 
 import javafx.fxml.FXMLLoader; 
 import javafx.scene.Parent; 
 import javafx.scene.Scene; 
 import javafx.scene.text.Text; 
 import javafx.stage.Stage; 
 
 import java.io.IOException; 
 
公共类HomeController {
私人父母; 
私密场景场景; 
私人舞台舞台; 
 @FXML 
 private Text welcomeText; 
 
 public HomeController（）{
 FXMLLoader fxmlLoader = new FXMLLoader（getClass（）。getResource（/ fxml / home.fxml））; 
 fxmlLoader.setController（this）; 
 try {
 parent =（Parent）fxmlLoader.load（）; 
 scene = new Scene（parent，600,400）; 
} catch（IOException e）{
 e.printStackTrace（）; 
} 
} 
 
 
 public void redirectHome（阶段阶段，字符串名称）{
 stage.setTitle（Home）; 
 stage.setScene（场景）; 
 welcomeText.setText（Hello+ name +！欢迎您。）; 
 stage.hide（）; 
 stage.show（）; 
} 
} 
  

home.fxml

 <？xml version =1.0encoding =UTF-8？> 
<？import java.lang。*？> 
<？import java.net。*？> 
<？import javafx.geometry。*？> 
<？import javafx.geometry.Insets？> 
<？import javafx.scene.control。*？> 
<？import javafx.scene.control.Button？> 
<？import javafx.scene.control.Label？> 
<？import javafx.scene.layout。*？> 
<？import javafx.scene.layout.GridPane？> 
<？import javafx.scene.text。*？> 
<？import sample.LoginController？> 
 
< GridPane alignment =CENTERhgap =10.0vgap =10.0xmlns：fx =http://javafx.com/fxml> 
< padding> 
< Insets bottom =10.0left =25.0right =25.0top =25.0/> 
< / padding> 
< Text fx：id =welcomeTexttext =homeGridPane.columnIndex =0GridPane.columnSpan =2GridPane.rowIndex =0/> 
 
< / GridPane> 
  

login.fxml

 <？xml version =1.0encoding =UTF-8？> 
<？import java.lang。*？> 
<？import java.net。*？> 
<？import javafx.geometry。*？> 
<？import javafx.geometry.Insets？> 
<？import javafx.scene.control。*？> 
<？import javafx.scene.control.Button？> 
<？import javafx.scene.control.Label？> 
<？import javafx.scene.layout。*？> 
<？import javafx.scene.layout.GridPane？> 
<？import javafx.scene.text。*？> 
<？import sample.LoginController？> 
 
< GridPane alignment =CENTERhgap =10.0vgap =10.0xmlns：fx =http://javafx.com/fxml> 
< padding> 
< Insets bottom =10.0left =25.0right =25.0top =25.0/> 
< / padding> 
< Text text =LoginGridPane.columnIndex =0GridPane.columnSpan =2GridPane.rowIndex =0/> 
< Label text =用户名：GridPane.columnIndex =0GridPane.rowIndex =1/> 
< TextField fx：id =userNameGridPane.columnIndex =1GridPane.rowIndex =1/> 
< Label text =Password：GridPane.columnIndex =0GridPane.rowIndex =2/> 
< PasswordField fx：id =passwordFieldGridPane.columnIndex =1GridPane.rowIndex =2/> 
< HBox alignment =BOTTOM_RIGHTspacing =10.0GridPane.columnIndex =1GridPane.rowIndex =4> 
< Button onAction =＃handleSubmitButtonActiontext =登录/> 
< / HBox> 
< / GridPane> 
  

使用Maven会更好地解决问题。

谢谢！

Can someone suggest ,how can we pass the value from one controller to another controller . My scenario is below

I need to get the username on my home page after login. please share the piece of code.

Thanks in Advance!!!

解决方案

As I understood from your question, you need a login screen and then other screens in a row for navigation. First user has to sign in and after validating then the user information will go to the Home screen. Below is the codes which may help you -

Main.java

package sample;    
import javafx.application.Application;
import javafx.stage.Stage;

public class Main extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception {
        LoginController loginController = new LoginController();
        loginController.launchLogingController(primaryStage);
    }


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

LoginController.java

package sample;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.TextField;
import javafx.stage.Stage;

import java.io.IOException;


public class LoginController {

    private Parent parent;
    private Scene scene;
    private Stage stage;
    @FXML
    private TextField userName;
    @FXML
    private TextField passwordField;

    private HomeController homeController;

    public LoginController() {
        FXMLLoader fxmlLoader = new          FXMLLoader(getClass().getResource("/fxml/login.fxml"));
        fxmlLoader.setController(this);
        try {
            parent = (Parent) fxmlLoader.load();
            scene = new Scene(parent, 600, 400);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @FXML
    protected void handleSubmitButtonAction(ActionEvent event) {
        System.out.println(userName.getText());
        if (userName.getText().trim().length() > 0 && passwordField.getText().trim().length() > 0) {
            homeController = new HomeController();
            homeController.redirectHome(stage, userName.getText().trim());
        }

    }

    public void launchLogingController(Stage stage) {
        this.stage = stage;
        stage.setTitle("User Login");
        stage.setScene(scene);
        stage.setResizable(true);
        stage.hide();
        stage.show();
    }
}

HomeController.java

 package sample;
    import javafx.fxml.FXML;
    import javafx.fxml.FXMLLoader;
    import javafx.scene.Parent;
    import javafx.scene.Scene;
    import javafx.scene.text.Text;
    import javafx.stage.Stage;

    import java.io.IOException;

    public class HomeController {
        private Parent parent;
        private Scene scene;
        private Stage stage;
        @FXML
        private Text welcomeText;

        public HomeController() {
            FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("/fxml/home.fxml"));
            fxmlLoader.setController(this);
            try {
                parent = (Parent) fxmlLoader.load();
                scene = new Scene(parent, 600, 400);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }


        public void redirectHome(Stage stage, String name) {
            stage.setTitle("Home");
            stage.setScene(scene);
            welcomeText.setText("Hello " + name + "! You are welcome.");
            stage.hide();
            stage.show();
        }
    }

home.fxml

<?xml version="1.0" encoding="UTF-8"?>
<?import java.lang.*?>
<?import java.net.*?>
<?import javafx.geometry.*?>
<?import javafx.geometry.Insets?>
<?import javafx.scene.control.*?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.layout.GridPane?>
<?import javafx.scene.text.*?>
<?import sample.LoginController?>

<GridPane alignment="CENTER" hgap="10.0" vgap="10.0" xmlns:fx="http://javafx.com/fxml">
  <padding>
    <Insets bottom="10.0" left="25.0" right="25.0" top="25.0" />
  </padding>
  <Text fx:id="welcomeText" text="home" GridPane.columnIndex="0" GridPane.columnSpan="2" GridPane.rowIndex="0" />

</GridPane>

login.fxml

<?xml version="1.0" encoding="UTF-8"?>
<?import java.lang.*?>
<?import java.net.*?>
<?import javafx.geometry.*?>
<?import javafx.geometry.Insets?>
<?import javafx.scene.control.*?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.layout.GridPane?>
<?import javafx.scene.text.*?>
<?import sample.LoginController?>

<GridPane alignment="CENTER" hgap="10.0" vgap="10.0" xmlns:fx="http://javafx.com/fxml">
  <padding>
    <Insets bottom="10.0" left="25.0" right="25.0" top="25.0" />
  </padding>
  <Text text="Login" GridPane.columnIndex="0" GridPane.columnSpan="2" GridPane.rowIndex="0" />
  <Label text="User Name:" GridPane.columnIndex="0" GridPane.rowIndex="1" />
  <TextField fx:id="userName" GridPane.columnIndex="1" GridPane.rowIndex="1" />
  <Label text="Password:" GridPane.columnIndex="0" GridPane.rowIndex="2" />
  <PasswordField fx:id="passwordField" GridPane.columnIndex="1" GridPane.rowIndex="2" />
  <HBox alignment="BOTTOM_RIGHT" spacing="10.0" GridPane.columnIndex="1" GridPane.rowIndex="4">
    <Button onAction="#handleSubmitButtonAction" text="Sign In" />
  </HBox>
</GridPane>

Using Maven will be better for tackling problems.

Thanks!

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