请耐心等待，我仍然是初学者，请不要粗鲁地发表评论。
因此，此问题的目的是让我学习如何将已经透明的JFrame的背景设置为模糊。这就是我现在所拥有的。
如您所见，它是透明的，但不是模糊的。我以为Java可能有一些过程可以模糊JAR中的图像并将其用作背景，而无需更改原始图像。所以我看了看，但没有发现对我有帮助。
如上所示，JFrame的背景是一个没有文本的标签，而是“背景图像”作为标签的图标。
JAR的组织:
META-INF(folder) > MANIFEST.MF
SystemInfo(folder) > classes and background image
这是我到目前为止的代码，但是没有用。
setOpacity(); // sets opacity of the background
Color c = Color.WHITE; // default color
setColor(c);
//background = (new JLabel((Icon) new ImageIcon(a)));
BufferedImage mshi = null;
try{mshi = ImageIO.read(new File("SystemInfo/black.png"));}catch(Exception e){e.printStackTrace();}
BufferedImage databuf = new BufferedImage(mshi.getWidth(null),
mshi.getHeight(null),
BufferedImage.TYPE_INT_BGR);
Graphics g = databuf.getGraphics();
g.drawImage(mshi, 455, 255, null);
float[] blurKernel = {
1 / 9f, 1 / 9f, 1 / 9f,
1 / 9f, 1 / 9f, 1 / 9f,
1 / 9f, 1 / 9f, 1 / 9f
};
BufferedImageOp blur = new ConvolveOp(new Kernel(3, 3, blurKernel));
mshi = blur.filter(mshi, new BufferedImage(mshi.getWidth(),
mshi.getHeight(), mshi.getType()));
g.dispose();
//background = (new JLabel((Icon) new ImageIcon(mshi)));
background.setIcon((Icon)new JLabel(new ImageIcon(mshi)));
上面的代码产生的错误:
javax.imageio.IIOException: Can't read input file!
at javax.imageio.ImageIO.read(ImageIO.java:1301)
at SystemInfo.GuiMain.cinitComponents(GuiMain.java:150)
at SystemInfo.GuiMain.<init>(GuiMain.java:30)
at SystemInfo.GuiMain$8.run(GuiMain.java:256)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:733)
at java.awt.EventQueue.access$200(EventQueue.java:103)
at java.awt.EventQueue$3.run(EventQueue.java:694)
at java.awt.EventQueue$3.run(EventQueue.java:692)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:703)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at SystemInfo.GuiMain.cinitComponents(GuiMain.java:152)
at SystemInfo.GuiMain.<init>(GuiMain.java:30)
at SystemInfo.GuiMain$8.run(GuiMain.java:256)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:733)
at java.awt.EventQueue.access$200(EventQueue.java:103)
at java.awt.EventQueue$3.run(EventQueue.java:694)
at java.awt.EventQueue$3.run(EventQueue.java:692)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:703)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
如果需要它，则setOpacity();功能:
float fOpacity = (float)opacity/10;
String sOpacity = Float.toString(fOpacity)+"f";
this.setOpacity(Float.parseFloat(sOpacity));
我的主要目标是让JFrame产生如下内容:
如您所见，该框架稍微模糊了计算机背景，并且是透明的。
谢谢大家。
最佳答案
我对"SystemInfo/black.png"的第一次猜测不能被称为File，因为它是驻留在应用程序Jar中的嵌入式/内部资源。
为了阅读(通过ImageIO)，您将需要使用更多类似...
ImageIO.read(getClass().getResource("SystemInfo/black.png"))
代替。
其次，模糊图像可能不会产生您想要的效果，因为它不会影响窗口后内容的实际绘制方式。
相反，您将需要捕获窗口下方的屏幕部分并将其模糊。
您可以使用
Robot实现此目的，但是在抓取屏幕截图时需要使窗口不可见。这也不是“实时”更新。