271°

javaFX在一个按钮的事件中显示另一个窗体

第一个窗体的按钮事件:

 @FXML
    protected  void show2Action() throws IOException {
        Stage stage = new Stage();
        AnchorPane pane = FXMLLoader.load(getClass().getResource("javafxcontroller2.fxml"));
        Scene scene = new Scene(pane,300,400);
        stage.setScene(scene);
        stage.show();
    }

代码很简单,第二个窗体的fxml文件:

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

<?import javafx.scene.control.Button?> <?import javafx.scene.control.Label?> <?import javafx.scene.layout.AnchorPane?> <?import javafx.scene.layout.ColumnConstraints?> <?import javafx.scene.layout.GridPane?> <?import javafx.scene.layout.RowConstraints?>

<AnchorPane fx:id="containerid" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8.0.172-ea" xmlns:fx="http://javafx.com/fxml/1" fx:controller="com.example.javafxminademo.Javafxcontroller2"> <children> <GridPane layoutX="149.0" layoutY="116.0"> <columnConstraints> <ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" /> <ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" /> </columnConstraints> <rowConstraints> <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" /> <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" /> <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" /> </rowConstraints> <children> <Label id="lblinfo" fx:id="lblinfo" text="Label" GridPane.columnIndex="1" GridPane.rowIndex="1" /> <Button fx:id="btnid" mnemonicParsing="false" text="Button" GridPane.rowIndex="2" /> </children> </GridPane> </children> </AnchorPane>

但是程序始终说FXMLLoader.load空指针异常,很明显就是getClass().getResource不正确,经过仔细查看,发现是我的第一个controller所在的类与第二controller所在类的路径不一样,所以将getResource时的路径应该以第二个controller相对于第一个controller的类路径作为参数,改为:

AnchorPane pane = FXMLLoader.load(getClass().getResource("../javafxcontroller2.fxml"));

则一切都正常了。

本文由【whoisliang】发布于开源中国,原文链接:https://my.oschina.net/u/2963604/blog/3160677

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