Java FXML 从绝对路径加载(动态)

Question

我想从绝对路径或 jar 系统外部的路径加载 fxml 文件。

背景:它将是一个简单的插件系统，在插件文件夹中查找所有 fxml 文件(后来的 jar 文件)并将其自动包含在 TabPane 中。

String fxmlpath = "C:\\plugin\\pluginfxml.fxml";
try {
    Parent root = FXMLLoader.load(getClass().getResource(fxmlpath));
    //Load root in Tabpane and so on ...
}

Answer 1

应该很简单:

Parent root = FXMLLoader.load(Paths.get(fxmlpath).toUri().toURL());

FXMLLoader 将 URL 作为其参数，因此我们只需使用 NIO Paths 类来获取 Path，然后将其转换为 URL。如果程序没有对文件位置的读取访问权限，则会出现唯一的问题。”

我使用 JavaFX 教程中的示例代码充实了该示例:

测试应用:

package javafx;

import java.net.URL;
import java.nio.file.Paths;

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

public class FXMLTest extends Application {

    public static void main(String[] args) {
        Application.launch(FXMLTest.class, args);
    }

    @Override
    public void start(Stage stage) throws Exception {
        URL fxmlURL = Paths.get("C:\\test\\fxml_example.fxml").toUri().toURL();
        Parent root = FXMLLoader.load(fxmlURL);

        stage.setTitle("FXML Welcome");
        Scene myScene = new Scene(root, 300, 275);
        stage.setScene(myScene);
        stage.show();
    }
}

示例 Controller :

package javafx;

import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.scene.text.Text;

public class FXMLExampleController {
    @FXML private Text actiontarget;

    @FXML protected void handleSubmitButtonAction(ActionEvent event) {
        actiontarget.setText("Sign in button pressed");
    }
}

FXML 示例:

<?xml version="1.0" encoding="UTF-8"?>

<?import java.net.*?>
<?import javafx.geometry.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.text.*?>


<GridPane fx:controller="javafx.FXMLExampleController" 
    xmlns:fx="http://javafx.com/fxml" alignment="center" hgap="10" vgap="10"
    styleClass="root">
    <padding><Insets top="25" right="25" bottom="25" left="25"/></padding>

    <Text id="welcome-text" text="Welcome" 
         GridPane.columnIndex="0" GridPane.rowIndex="0"
        GridPane.columnSpan="2"/>

    <Label text="User Name:"
        GridPane.columnIndex="0" GridPane.rowIndex="1"/>

    <TextField 
        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 spacing="10" alignment="bottom_right" 
        GridPane.columnIndex="1" GridPane.rowIndex="4">
        <Button text="Sign In"     
        onAction="#handleSubmitButtonAction"/>
    </HBox>

    <Text fx:id="actiontarget"
        GridPane.columnIndex="1" GridPane.rowIndex="6"/>

    <stylesheets>
      <URL value="@Login.css" />
    </stylesheets>

</GridPane>