Java：从JAR运行时的文件路径 [英] Java: file path when running from as JAR

问题描述

我有一个Java / JavaFX项目，我使用样式表。

I have a Java/JavaFX project where I use style sheets.

样式表中的图像将按如下方式加载：

Images from stylesheets will get loaded as follows:

#pane {
-fx-background-image:url('../packagename/image.jpg');
 }

当我从Eclipse或Scenebuilder编译并运行它时，它加载正常。但是，当从cmd（ java -jar project.jar ）运行我的jar文件时，它会将文件名添加到路径中，并将其更改为：

It loads fine when I compile and run it from Eclipse or Scenebuilder. However, when running my jar file from the cmd (java -jar project.jar), it adds the file name to the path, changing it to:

project.jar/packagename/image.jpg

并且显然无法加载它。我如何获得正确的路径，或者从某种方式jar生成的路径中省略jar？ jar文件在这里的包文件夹中列为 packagename 。

and obviously failing to load it. How do I get the correct path, or alternatively, omit the jar from the somehow jar generated path? The jar file is in the package folder here outlined as packagename.

推荐答案

假设packageName是来自jar文件根目录的路径，它显然会失败。路径上的 ../ 前缀将导致您的相对位置将上升到其父目录，并在 ../ <之后搜索该部分/ code>来自该目录。

Assuming the "packageName" is a path from the root of the jar file, it will obviously fail. The ../ prefix on your path will cause your relative location will go up to its parent directory, and search the part after the ../ from that directory.

在eclipse中，父目录可能是项目目录，而在.jar文件中，它是jar文件本身给出你描述的结果。修复将是使用源目录（在eclipse中的buildpath中配置）。这些sourcepath的结构取决于你，虽然常见的结构如下：

In eclipse the parent directory would propably be the project directory, while in your .jar file, it is the jar file itself giving the result you described. A fix would be to use source directories (configured in the "buildpath" in eclipse). The structure of these sourcepath's is up to you, though a common structure is as follows:

Root (either the eclipse project folder, or the .jar file
   | src
   |   | main
   |      | java // usually here goes all the code
   |      | resources  // and here goes all the resources the code needs.

同样，上述内容并不要求使java项目完美，尽管这是常见的做法。

Again the above is no requirement to make a java project perfect, though it is common practise.

可能另一个修复方法是根本不使用 ../ ，虽然我不确定。可能只是.jar文件修复。

Propably another fix would be to use no ../ at all, although Im not sure about that. It might be a .jar-file-only fix.

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