Question

我已经遍布StackOverflow尝试为此找到解决方案，但它只是踢我的屁股。我必须为类项目重制Space Invaders，我需要使用ImageIO加载图像（.gif文件）。

我的所有图像和声音文件都在源文件夹中，如下所示。

每当我使用new File(/SItop0.gif")时，它都会给我一个IIOException。为什么我不能加载我的图像？

这是我的代码：

public BufferedImage getImage() {
    try {
        BufferedImage image = ImageIO.read(new File(/SItop0.gif")); // Line 30: this is the same for SITop, SIMiddle, and SIBottom. I'm just getting different images for each.
        return image;
    } catch (IOException e) {
        e.printStackTrace();
    }

    return null;
}

这是我想要在面板上绘制的对象的类，下面的代码在我调用该方法的面板的类中：

@Override
public void paintComponent(Graphics g) {
    super.paintComponent(g);
    for(int i = 0; i < 5; i++) {
        for(int j = 0; j < 10; j++) {
            if(i == 0) {
                SITop invader = new SITop();
                g.drawImage(invader.getImage(), 75+35*j, 80+25*i, null);
            }
            if(i == 1 || i == 2) {
                SIMiddle invader = new SIMiddle();
                g.drawImage(invader.getImage(), 75+35*j, 80+25*i, null);
            }
            if(i == 3 || i == 4) {
                SIBottom invader = new SIBottom();
                g.drawImage(invader.getImage(), 75+35*j, 80+25*i, null); // Line 42
            }
        }
    }
}

这是我得到的错误：

javax.imageio.IIOException: Can't read input file!
at javax.imageio.ImageIO.read(Unknown Source)
at SIBottom.getImage(SIBottom.java:30)
at SIPanel.paintComponent(SIPanel.java:42)
at javax.swing.JComponent.paint(Unknown Source)
at javax.swing.JComponent.paintChildren(Unknown Source)
at javax.swing.JComponent.paint(Unknown Source)
at javax.swing.JComponent.paintChildren(Unknown Source)
at javax.swing.JComponent.paint(Unknown Source)
at javax.swing.JLayeredPane.paint(Unknown Source)
at javax.swing.JComponent.paintChildren(Unknown Source)
at javax.swing.JComponent.paintToOffscreen(Unknown Source)
at javax.swing.RepaintManager$PaintManager.paintDoubleBuffered(Unknown Source)
at javax.swing.RepaintManager$PaintManager.paint(Unknown Source)
at javax.swing.RepaintManager.paint(Unknown Source)
at javax.swing.JComponent.paint(Unknown Source)
at java.awt.GraphicsCallback$PaintCallback.run(Unknown Source)
at sun.awt.SunGraphicsCallback.runOneComponent(Unknown Source)
at sun.awt.SunGraphicsCallback.runComponents(Unknown Source)
at java.awt.Container.paint(Unknown Source)
at java.awt.Window.paint(Unknown Source)
at javax.swing.RepaintManager$4.run(Unknown Source)
at javax.swing.RepaintManager$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)
at javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)
at javax.swing.RepaintManager.prePaintDirtyRegions(Unknown Source)
at javax.swing.RepaintManager.access$1200(Unknown Source)
at javax.swing.RepaintManager$ProcessingRunnable.run(Unknown Source)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$500(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

编辑：

我将行更改为BufferedImage image = ImageIO.read(new File("Assets/SItop0.gif"));并更改了方法以覆盖paintComponent，现在它打开了框架和面板，但它似乎没有绘制任何东西。屏幕只是黑色。

编辑2：

将我的问题中的代码更改为与我现在使用的代码一致。

尝试使用Java加载图像时出现NullPointerException和IllegalArgumentException

0 个答案: