java JavaFx 图像路径
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JavaFx Images Path
提问by Viktoria
I have a problem with my Java class. Actually the code is correctly, but if I click the run-button there's a exception caused of the path of the image.
我的 Java 类有问题。实际上代码是正确的，但是如果我单击运行按钮，则会出现图像路径导致的异常。
static Image currentBackground = new Image("Snake/Images/background_options.png", true);
And the compiler's message is:
编译器的消息是：
Exception in thread "main" java.lang.ExceptionInInitializerError
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:122)
Caused by: java.lang.IllegalArgumentException: Invalid URL: Invalid URL or resource not found
at javafx.scene.image.Image.validateUrl(Image.java:1100)
at javafx.scene.image.Image.<init>(Image.java:624)
at view.OptionsWindow.<clinit>(OptionsWindow.java:21)
... 3 more
Caused by: java.lang.IllegalArgumentException: Invalid URL or resource not found
at javafx.scene.image.Image.validateUrl(Image.java:1092)
... 5 more
Process finished with exit code 1
进程以退出代码 1 结束
Can anybody help me?
有谁能够帮我？
回答by James_D
The Imageconstructoris expecting the specification of a URL, not a file system path. Assuming you are bundling this image as part of your application, you will need to load that from the same place as your classes are loaded: probably a jar file in your final deployment, but perhaps from the file system during development.
该Image构造被期待的规范网址，而不是一个文件系统路径。假设您将此映像捆绑为应用程序的一部分，您将需要从加载类的同一位置加载它：可能是最终部署中的一个 jar 文件，但也可能是开发过程中的文件系统。
The mechanism to get a URL representing a resource which is part of the application is to call getResource()on a Classor ClassLoader.
该机制得到代表的资源是应用程序的一部分是调用URLgetResource()上Class或ClassLoader。
The exact way to do this depends on your project structure, which you haven't shown, but for example:
执行此操作的确切方法取决于您尚未显示的项目结构，但例如：
new Image(getClass().getResource("Snake/Images/background_options.png").toString(), true);
will load the image from a resource, specified relative to the current class, and
将从相对于当前类指定的资源加载图像，并且
new Image(getClass().getClassLoader().getResource("Snake/Images/background_options.png").toString(), true);
will load the image from a resource specified relative to the class path.
将从相对于类路径指定的资源加载图像。
In the event you pass a Stringthat represents a relative URL (i.e. one with no scheme, such as file:, http:, or jar:), then the Imageconstructor will search on the class path for the resource. In other words
在事件中，你传递一个String代表相对URL（即一个没有方案，如file:，http:或jar:），那么Image构造函数将搜索资源类路径上。换句话说
new Image("Snake/Images/background_options.png", true);
is equivalent to
相当于
new Image(getClass().getClassLoader().getResource("Snake/Images/background_options.png").toString(), true);
This seems slightly counter-intuitive (to me, at least), so I prefer to always specify a URL completely, or to retrieve one from getClass().getResource()or File.toURI().toURL()as appropriate.
这似乎有点违反直觉（至少对我来说），所以我更喜欢总是完全指定一个 URL，或者从getClass().getResource()或File.toURI().toURL()适当地检索一个 URL 。
