如果您在 jar 中运行 java，您能告诉运行时吗? [英] Can you tell on runtime if you're running java from within a jar?

问题描述

我有一个应用程序，我的一些用户从 Eclipse 运行，而其他用户则使用 jar 文件运行它.

I have an application that some of my users run from Eclipse, and others run it by using a jar file.

我希望在从 jar 中运行时完成一些操作，但我不希望在从 Eclipse 运行时完成它们.

I want some actions to be done when running from within the jar, but I don't want them to be done when running from Eclipse.

有没有办法在运行时知道当前应用程序是否在 jar 中运行?

Is there a way to know on runtime whether the current application is running from within a jar?

谢谢！

迪克拉

推荐答案

好吧，你可以判断一个类是否已经从 JAR 文件加载 - 使用 Foo.class.getResource("Foo.class") 并查看返回的 URL 是否以jar:"开头

Well, you can tell whether or not a class has been loaded from a JAR file - use Foo.class.getResource("Foo.class") and see whether the returned URL begins with "jar:"

以这个程序为例:

public class Foo {

    public static void main(String[] args) {
        System.out.println(Foo.class.getResource("Foo.class"));
    }
}

运行它从文件系统加载文件:

Running it loading the file from the file system:

file:/C:/Users/Jon/Test/com/whatever/Foo.class

从 jar 文件运行它:

Running it from a jar file:

jar:file:/C:/Users/Jon/Test/foo.jar!/com/whatever/Foo.class

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