java 获取程序正在运行的 .jar 文件的 URL
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Get URL of file in .jar that the program is running
提问by aLaserShark
Given hello.jar, which is compiled with maven, I want to access a resource located under folder/file.file. However I don't know how to get the URL of the current JAR I am in. Would
给定使用 maven 编译的 hello.jar，我想访问位于文件夹/file.file 下的资源。但是我不知道如何获取我所在的当前 JAR 的 URL。会
file://./folder/file.file
work correctly, or,
正常工作，或者，
jar:file://./!hello.jar/folder/file.file
or is there an easier way to do this?
或者有没有更简单的方法来做到这一点？
(Sorry for the dumb question, I'm new to maven.)
（对不起，这个愚蠢的问题，我是 maven 的新手。）
回答by a_horse_with_no_name
This works for me:
这对我有用：
URL url = this.getClass().getProtectionDomain().getCodeSource().getLocation();
String jarPath = URLDecoder.decode(url.getFile(), "UTF-8");
jarPaththen contains the complete path to the jar file where the class with that code is located.
jarPath然后包含具有该代码的类所在的 jar 文件的完整路径。
Note the "detour" through URLDecoder, otherwise you'll get a filename containing %20 if the jar files is located in a directory that contains spaces.
请注意 URLDecoder 中的“绕行”，否则如果 jar 文件位于包含空格的目录中，您将获得包含 %20 的文件名。
回答by JohnKlehm
You can find a jar's resources by using:
您可以使用以下命令查找 jar 的资源：
String resRelativePath = "folder/thing.jpg";
URL resUrl = this.getClass().getResource(resRelativePath);
