你能告诉运行时你是否在jar中运行java？ [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.

我想在运行时执行一些操作从jar中运行，但我不希望它们在从Eclipse运行时完成。

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正在运行在一个罐子里？

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

谢谢！

Dikla

推荐答案

那么，您可以判断是否已从JAR文件加载类 - 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:"

例如，请使用此程序：

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：

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

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