java - 如何从项目文件夹中检索图像

Question

我正在尝试从我的文件夹图像中随机播放图像，这是我能够做到的。我必须传递图像的名称，但我不想传递图像的名称，我只想给出文件夹的名称，所有图像都应该从那里开始，我该怎么做

这是我的代码

public class main1 extends javax.swing.JFrame {

    private JLabel ecause = new JLabel();
    private List<BufferedImage> list = new ArrayList<BufferedImage>();
    private List<BufferedImage> shuffled;
    private JLabel label = new JLabel();
    private int width = 700;
    private int height = 700;
    private Timer timer = new Timer(4000, new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {
            update();
        }
    });

    public main1() {
        this.getContentPane().setBackground(new java.awt.Color(153, 153, 0));
        this.setUndecorated(true);
        ecause.setText("           eCause List");
        ecause.setBounds(0, 1278, 496, 88);
        ecause.setFont(new java.awt.Font("Times New Roman", 1, 40));
        ecause.setBackground(new java.awt.Color(255, 153, 0));
        ecause.setOpaque(true);
        this.add(ecause);
        initComponents();
        try {
            list.add(resizeImage(ImageIO.read(new File("images\\Picture2.png"))));
            list.add(resizeImage(ImageIO.read(new File("images\\Picture3.png"))));
            list.add(resizeImage(ImageIO.read(new File("images\\Picture4.png"))));
            list.add(resizeImage(ImageIO.read(new File("images\\Picture5.png"))));
        } catch (IOException e) {
            e.printStackTrace();
        }
        shuffled = new ArrayList<BufferedImage>(list);
        Collections.shuffle(shuffled);
        timer.start();

    }

    private BufferedImage resizeImage(BufferedImage originalImage) throws IOException {
        BufferedImage resizedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
        Graphics2D g = resizedImage.createGraphics();
        g.drawImage(originalImage, 0, 0, width, height, null);
        g.dispose();
        return resizedImage;
    }

    private void update() {
        if (shuffled.isEmpty()) {
            shuffled = new ArrayList<BufferedImage>(list);
            Collections.shuffle(shuffled);
        }
        BufferedImage icon = shuffled.remove(0);
        jLabel3.setIcon(new ImageIcon(icon));
    }
}

如何实现我的输出？

Answer 1

您可以像这样列出文件夹中包含的每个文件:

File[] files = new File("images/").listFiles();

请注意，它还会提供子目录。

所以而不是

list.add(resizeImage(ImageIO.read(new File("images\\Picture2.png"))));
list.add(resizeImage(ImageIO.read(new File("images\\Picture3.png"))));
list.add(resizeImage(ImageIO.read(new File("images\\Picture4.png"))));
list.add(resizeImage(ImageIO.read(new File("images\\Picture5.png"))));

您可以简单地循环 listFiles 方法给出的每个文件。您还可以使用listFiles(FileFilter)为了过滤掉每个不是图像的文件。