图片

定义Image ：

 Image image = new Image(URL);  

其中，URL可以指向网络图片、资源图片或本地图片。示例：

网络图片

网络图片 是指存储在服务器上，可通过网络访问的图片资源。网络图片通常遵循 http 或 https 协议。例如：

 Image image = new Image("#34;);  

本地图片

本地图片 是指存储在本地的图片资源。本地图片需遵循 File 协议。例如：

 Image image = new Image("file:C://SunShangXiang.jpg");  

可改写为：

 File file = new File("C://SunShangXiang.jpg");
String uri = file.toURI().toString();
Image image = new Image(uri);  

资源图片

 URL url = ImageApplication.class.getResource("/images/logo.png");
       
Image image = new Image(url.toURI().toString());  

完整代码

 package io.weijunfu.javafx;

import  javafx .application.Application;
import javafx.scene.Scene;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;

import  java .io.File;
import java.net.URL;

public class ImageApplication  extends  Application {
    @ Override 
    public  void  start(Stage stage) throws  Exception  {
        BorderPane pane = new BorderPane();

        // image 用于加载图片

//        来自网络图片
//        Image image = new Image("#34;);

//        来自本地图片
//        Image image = new Image("file:C://SunShangXiang.jpg");

//        File file = new File("C://SunShangXiang.jpg");
//        String uri = file.toURI().toString();
//        Image image = new Image(uri);

//        来自资源文件
        URL url = ImageApplication.class.getResource("/images/logo.png");

        Image image = new Image(url.toURI().toString());

        double width = image.getWidth();
        double height = image.getHeight();

        // imageView 用于显示图片
        ImageView imageView = new ImageView();
        imageView.setImage(image);

        pane.setCenter(imageView);

        // 创建场景
        Scene scene = new Scene(pane, width, height);

        // 给舞台添加场景
        stage.setScene(scene);

        // 设置窗口标题
        stage.setTitle("图片展示");

        // 显示舞台
        stage.show();
    }

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

电子相册

获取图片存储目录

         URL url = AlbumApplication.class.getResource("/images/album");  // 图片存储目录
        File file = new File(url.toURI());
        if(file. exists () && file.isDirectory()) {
            files = file.listFiles(new FilenameFilter() {
                @Override
                public boolean accept(File dir, String name) {
                    int index = name.lastIndexOf(".");
                    String suffix = name.substring(index).toLowerCase(Locale.ROOT);

                    switch (suffix) {   // 仅获取jpg和png格式的图片
                        case ".jpg":
                        case ".png":
                            return true;
                    }

                    return false;
                }
            });

            if(files.length > 0) { // 默认显示第一张照片
                Image image = new Image(files[ current Index].getAbsolutePath());
                imageView.setImage(image);
            }
        }  

上一张 & 下一张

 // 上一张
 private  void prevPhone() {
    currentIndex--;

    currentIndex = currentIndex < 0 ? files.length-1 : currentIndex;

    imageView.setImage(new Image(files[currentIndex].getAbsolutePath()));
}  

 // 下一张
private void nextPhone() {
    currentIndex++;

    currentIndex = currentIndex >= files.length ? 0 : currentIndex;

    imageView.setImage(new Image(files[currentIndex].getAbsolutePath()));
}  

完整代码

 package io.weijunfu.javafx;

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.AnchorPane;
import javafx.stage.Stage;

import java.io.File;
import java.io.FilenameFilter;
import java.net.URL;
import java.util.Arrays;
import java.util. Locale ;

/**
 * 电子相册
 *
 * @Author: weijunfu<ijunfu@163.com>
 * @Date: 2021-11-11 22:29
 * @Version: 1.0.0
 */
public class AlbumApplication extends Application {

    private final static double width = 320;
    private final static double height = 240;

    private Integer currentIndex = 0;
    private File[] files;
    private ImageView imageView = new ImageView();

    @Override
    public void start(Stage stage) throws Exception {
        AnchorPane pane = new AnchorPane();

//        ImageView imageView = new ImageView();
        imageView.setFitWidth(width);
        imageView.setFitHeight(height);
        imageView.setX(0);
        imageView.setY(0);
        pane.getChildren().add(imageView);

        URL url = AlbumApplication.class.getResource("/images/album");  // 图片存储目录
        File file = new File(url.toURI());
        if(file.exists() && file.isDirectory()) {
            files = file.listFiles(new FilenameFilter() {
                @Override
                public boolean accept(File dir, String name) {
                    int index = name.lastIndexOf(".");
                    String suffix = name.substring(index).toLowerCase(Locale.ROOT);

                    switch (suffix) {   // 仅获取jpg和png格式的图片
                        case ".jpg":
                        case ".png":
                            return true;
                    }

                    return false;
                }
            });

            if(files.length > 0) { // 默认显示第一张照片
                Image image = new Image(files[currentIndex].getAbsolutePath());
                imageView.setImage(image);
            }
        }

        Label leftLabel = new Label("<");
        leftLabel.setLayoutX(0);
        leftLabel.setLayoutY(0);
        leftLabel.setPrefWidth(50);
        leftLabel.setPrefHeight(height);
        leftLabel.setStyle("-fx-background-color: purple; ");
        leftLabel.setOpacity(0.2);
        leftLabel.setOnMouseClicked(keyEvent -> {
            prevPhone();
        });

//        pane.getChildren().add(leftLabel);

        Label rightLabel = new Label(">");
        rightLabel.setLayoutX(width-50);
        rightLabel.setLayoutY(0);
        rightLabel.setPrefWidth(50);
        rightLabel.setPrefHeight(height);
        rightLabel.setStyle("-fx-background-color: purple; ");
        rightLabel.setOpacity(0.2);
        rightLabel.setOnMouseClicked(keyEvent -> {
            nextPhone();
        });

//        pane.setRight(rightLabel);
        pane.getChildren().addAll(leftLabel, rightLabel);

        Scene scene = new Scene(pane, width, height);
        stage.setScene(scene);
        stage.setTitle("电子相册");
        stage.show();
    }

    /**
     * 上一张照片
     * @Author: weijunfu<ijunfu@163.com>
     * @Version: 1.0.0
     * @Date: 2021/11/12 1:03
      * @param
     * @Return: void
     */
    private void prevPhone() {
        currentIndex--;

        currentIndex = currentIndex < 0 ? files.length-1 : currentIndex;

        imageView.setImage(new Image(files[currentIndex].getAbsolutePath()));
    }

    /**
     * 下一张照片
     * @Author: weijunfu<ijunfu@163.com>
     * @Version: 1.0.0
     * @Date: 2021/11/12 1:02
      * @param 
     * @Return: void
     */
    private void nextPhone() {
        currentIndex++;

        currentIndex = currentIndex >= files.length ? 0 : currentIndex;

        imageView.setImage(new Image(files[currentIndex].getAbsolutePath()));
    }

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