导出的 JAR 无法读取图像 [英] Exported JAR Won't Read Image

问题描述

我正在尝试让图像显示在 JPanel 中.这是我正在使用的代码:

I am attempting to get an image to show up in a JPanel. Here is the code I'm using:

        URL imageURL;
        BufferedImage image = null;
        ImageIcon icon;

        imageURL = getClass().getClassLoader().getResource("images/audiorpglogo.png");
        if (imageURL == null) {
            System.out.println(imageURL == null);
            try { imageURL = new File("images/audiorpglogo.png").toURI().toURL(); }
            catch (Exception e1) { imageURL = null; }
        }

        System.out.println(imageURL == null);

        try { image = ImageIO.read(imageURL); }
        catch (Exception e) { }

        System.out.println(image == null);

        icon = new ImageIcon(image);

        System.out.println(icon == null);

        logo = new JLabel(icon);

当我在 Eclipse 中运行这个程序时，我得到以下输出:

When I run this program in Eclipse, I get the following output:

true
false
false
false

但是，当我将程序导出为可运行的 JAR 时，我得到以下输出:

However, when I export the program as a runnable JAR, I get this following output:

true
false
true
java.lang.NullPointerException
    at javax.swing.ImageIcon.<init>(ImageIcon.java:204)
    at me.pogostick29.audiorpg.window.Window.<init>(Window.java:85)
    at me.pogostick29.audiorpg.window.WindowManager.setup(WindowManager.java:16)
    at me.pogostick29.audiorpg.AudioRPG.main(AudioRPG.java:30)

预先感谢您的帮助！

推荐答案

您应该有一个资源文件夹，其中包含名为 images 的文件夹，然后它应该可以工作.

You should have a resource folder with the folder named images in that, then it should work.

示例:

我如何访问这些图标:

public BufferedImage icon32 = loadBufferedImage("/icon/icon32.png");
public BufferedImage icon64 = loadBufferedImage("/icon/icon64.png");

private BufferedImage loadBufferedImage(String string)
{
    try
    {
        BufferedImage bi = ImageIO.read(this.getClass().getResource(string));
        return bi;
    } catch (IOException e)
    {
        e.printStackTrace();
    }
    return null;
}

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