1

在下面的代码片段中，我尝试使用 javax.imageio.ImageIO 设置我的 JFrame 实例的图标，但出现以下异常。你能告诉我我错过了什么吗？

    import javax.imageio.ImageIO;
    ......
    BufferedImage image = null;
    try {
    //EXCEPTION IS thrown in the following line
        image = ImageIO.read(this.getClass().getResource("resources/Smartbook_icon.ico")); 
    } catch (IOException e) {
       ......
    }
    this.setIconImage(image);

异常堆栈跟踪

Exception in thread "AWT-EventQueue-0" java.lang.IllegalArgumentException:  input == null!
at javax.imageio.ImageIO.read(ImageIO.java:1362)
at se.websiter.bookingapp.UI.MainFrame.setGUIIcon(MainFrame.java:4131)
at se.websiter.bookingapp.UI.MainFrame.<init>(MainFrame.java:59)
at se.websiter.bookingapp.UI.MainFrame$60.run(MainFrame.java:4167)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
4

3 回答 3

2

可能是资源的路径不正确。我总是使用下面的代码片段来设置JFrame'图标图像假设resources是类'包的子目录：

import java.net.URL;

// Setting window's icon
String resourcePathToIcon = String.format("/%s/resources/myicon.png",
        MyClass.class.getPackage().getName().replace('.', '/'));
URL windowIconURL = MyClass.class.getResource(resourcePathToIcon);
if (windowIconURL != null)
    setIconImage(new ImageIcon(windowIconURL).getImage());

请注意，资源图像的路径以/.

于 2011-11-13T18:49:29.873 回答
1

找不到资源。检查它是否复制到编译的类文件夹或 jar 中。

于 2011-11-13T18:25:25.010 回答
1

确保您的图像位于资源文件夹中并使用 png 而不是 ico，然后您可以将其加载到 ImageIcon 并将其分配给 JFrame ：

frame.setIconImage(new ImageIcon(MainWindow.class.getResource("/resources/someicon.png")).getImage());
于 2011-11-13T19:01:41.407 回答