图像无法在.jar文件中使用 [英] Images will not work in a .jar file

问题描述

创建应用程序的JAR时，不再显示应用程序中的图像。我们加载图片的代码示例如下：

When a JAR of an application is created, the images in the application no longer appear. An example of our code for loading images is:

ImageIcon placeHolder = new ImageIcon("src\\Cards\\hidden.png");

我们不知道为什么会这样。如果我们不将它压缩到JAR，应用程序将按预期运行;作为一个JAR，图像就会消失。我们还尝试使用URL而不是ImageIcons，但这只会导致程序根本无法运行。

We have no idea why this is happening. The application runs as expected if we do not compress it to a JAR; as a JAR, the images simply disappear. We also tried using URLs instead of ImageIcons, but that just causes the program not to run at all.

有什么想法吗？

编辑：我们将图像文件放入正确路径的JAR文件中，这不是问题。

We are putting the image files into our JAR file in the correct paths, so that's not the problem.

推荐答案

检查您正在呼叫的构造函数的API。传入的字符串是文件路径 - 当资源打包在JAR中时，文件系统上没有包含图像的文件，因此您不能再使用此构造函数。

Check the API for the constructor you're calling. The string you pass in is a file path - when the resources are packaged in a JAR, there is no file on the filesystem containing the image, so you can't use this constructor any more.

相反，您需要使用类加载器从流中加载资源，并将它们拉入字节数组：

Instead you'd need to load the resources from a stream, using the classloader, and pull them into a byte array:

byte[] buffer = new byte[IMAGE_MAX_SIZE];
InputStream imageStream = getClassLoader().getResourceAsStream("src\Cards\hidden.png");
imageStream.read(buffer, 0, IMAGE_MAX_SIZE);
ImageIcon placeHolder = new ImageIcon(buffer);

当然需要更多例外和边缘案件处理，但这是它的要点。

Needs more exception and edge-case handling, of course, but that's the gist of it.

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