需要帮助显示来自url或filechooser的图像

我在使用url或filechooser显示图像时遇到问题 . 我已经实现了从url或pc中提取文件的方法，但不知道如何显示这些图像 .

这是我调用从url中提取的方法的地方：

@FXML
private void button0Action (ActionEvent event) throws IOException {

        catdog c = new catdog();
        String cat = c.cat();           
        System.out.println(cat);

输出对话框返回url：http://24.media.tumblr.com/tumblr_llmbvhAcsF1qg20muo1_500.gif

这是我的Display类：

package screensaver;

import javafx.application.Application;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.layout.GridPane;
import javafx.stage.Stage;

public class Display extends Application {
    @Override // Override the start method in the Application class
    public void start(Stage primaryStage) {
        GridPane pane = new GridPane();
        pane.setAlignment(Pos.CENTER);
        pane.setHgap(0);
        pane.setVgap(0);

        Scene scene = new Scene(pane);
        primaryStage.setTitle("imageViewer"); 
        primaryStage.setScene(scene); 
        primaryStage.show(); 
    }
}

创建了Display和ImageView的新实例：

@FXML
private void button0Action (ActionEvent event) throws IOException {

        catdog c = new catdog();
        String cat = c.cat();           
        System.out.println(cat);

        Display catDisplay = new Display();
        ImageView catImage = new ImageView(cat);

}

然后，我如何将图像添加到窗格并调用start方法来显示场景？我知道我可以在Display类中创建一个ImageView实例，然后将一个图像添加到窗格中，虽然我无法从button0Action方法中提取包含url的变量cat . 目前困住，不知道从哪里开始 . 过去几天一直在努力尝试不同的方法，没有运气 . 有任何想法吗？

到目前为止，我的更改如下：

展示类：

package screensaver;

import java.io.IOException;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.image.ImageView;
import javafx.scene.layout.GridPane;
import javafx.stage.Stage;

public class Display {
public void showImage0 (String url) throws IOException {

    Stage stage = new Stage();
    GridPane pane = new GridPane();
    pane.setAlignment(Pos.CENTER);
    pane.setHgap(0);
    pane.setVgap(0);

    Catdog c = new Catdog();
    pane.getChildren().add(new ImageView(c.cat()));

    Scene scene = new Scene(pane);
    stage.setTitle("imageViewer"); 
    stage.setScene(scene); 
    stage.show(); 
}

public void showImage1 (String url) throws IOException {

    Stage stage = new Stage();
    GridPane pane = new GridPane();
    pane.setAlignment(Pos.CENTER);
    pane.setHgap(0);
    pane.setVgap(0);

    Catdog d = new Catdog();
    pane.getChildren().add(new ImageView(d.dog()));

    Scene scene = new Scene(pane);
    stage.setTitle("imageViewer"); 
    stage.setScene(scene); 
    stage.show(); 
}

public void showImage2 (String url) throws IOException {

    Stage stage = new Stage();
    GridPane pane = new GridPane();
    pane.setAlignment(Pos.CENTER);
    pane.setHgap(0);
    pane.setVgap(0);

    LandscapeImage lI = new LandscapeImage();
    pane.getChildren().add(new ImageView(lI.imageSource));

    Scene scene = new Scene(pane);
    stage.setTitle("imageViewer"); 
    stage.setScene(scene); 
    stage.show(); 
}

public void showImage3 (String file) throws IOException {

    Stage stage = new Stage();
    GridPane pane = new GridPane();
    pane.setAlignment(Pos.CENTER);
    pane.setHgap(0);
    pane.setVgap(0);

    FileChooser fc3 = new FileChooser();

    pane.getChildren().add(new ImageView(fc3.fileChoice()));

    Scene scene = new Scene(pane);
    stage.setTitle("imageViewer"); 
    stage.setScene(scene); 
    stage.show(); 
    }
}

此处发生错误：此处不允许使用'void'类型

pane.getChildren().add(new ImageView(fc3.fileChoice()));

这是FileChooser类：

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package screensaver;

import java.io.File;
import java.io.IOException;
import javafx.scene.control.Alert;
import javafx.scene.control.ButtonType;

/**
 *
 * @author Jacob
 */
public class FileChooser {
void fileChoice () throws IOException{
    javafx.stage.FileChooser fc3 = new javafx.stage.FileChooser();
    File selectedFile = fc3.showOpenDialog(null);

    fc3.getExtensionFilters().addAll(
        new javafx.stage.FileChooser.ExtensionFilter("Image Files", "*.png", "*.jpg", "*.gif"));


    if (selectedFile != null) {

        String location = (selectedFile.getAbsoluteFile().toURI().toString());
        System.out.println(location);

        Display ownDisplay = new Display();
        ownDisplay.showImage3(location);
    } else {

        Alert alert = new Alert(Alert.AlertType.CONFIRMATION,"No file was selected");

        alert.showAndWait()
        .filter(response -> response == ButtonType.OK)
        .ifPresent((ButtonType response) -> {
            System.out.println("OK");
        });
    }
}
}

最新代码：

显示方式：

public void showImage3 (String file) throws IOException, Exception {

    Stage stage = new Stage();
    GridPane pane = new GridPane();
    pane.setAlignment(Pos.CENTER);
    pane.setHgap(0);
    pane.setVgap(0);

    pane.getChildren().add(new ImageView(file));

    Scene scene = new Scene(pane);
    stage.setTitle("imageViewer"); 
    stage.setScene(scene); 
    stage.show(); 
    }

button3Action方法：

@FXML
private void button3Action(ActionEvent event) throws IOException, Exception {

       FileChooser fc3 = new FileChooser();
       File selectedFile = fc3.showOpenDialog(null);

        fc3.getExtensionFilters().addAll(
        new ExtensionFilter("Image Files", "*.png", "*.jpg", "*.gif"));


    if (selectedFile != null) {

        String location =   (selectedFile.getAbsoluteFile().toURI().toString());
        System.out.println(location);
        Display fileChoice = new Display();
        fileChoice.showImage3(location);

    } else {

        Alert alert = new Alert(AlertType.CONFIRMATION,"No file was selected");

        alert.showAndWait()
        .filter(response -> response == ButtonType.OK)
        .ifPresent((ButtonType response) -> {
            System.out.println("OK");
        });

    }
    }