从类路径中的任何位置加载资源 [英] Load resource from anywhere in classpath

问题描述

我有一个简单的java应用程序，它从当前包中加载属性文件。

I have a simple java application that loads a properties file from the current package.

this.getClass().getResourceAsStream("props.properties");

当我想要的属性文件在当前包中时，这可以正常工作。但是，我想将此应用程序打包为JAR，并使用我使用它的新属性文件定义和覆盖。有没有办法加载类路径上名为props.properties的第一个资源？

This works fine when the property file I want is in the current package. However, I want to package this application as a JAR and define and override with a new properties file where I use it. Is there a way to load the first resource named "props.properties" that is on the classpath?

我希望通过命令轻松覆盖属性文件line：

I want it to be as easy to override the properties file via command line:

java.exe -classpath props.properties;myJar.jar com.test.MyApp

我不想解压缩JAR并修改属性文件来改变一些东西。我觉得我错过了一些明显的东西...

I don't want to have to unpack the JAR and modify the properties file to change something. I feel like I'm missing something obvious...

推荐答案

如果一切都失败了你可以使用两个不同的文件名，比如说 props-default.properties 在 myJar.jar 和 props.properties 在命令行上覆盖。在您的代码中，您首先尝试加载 props.properties 文件，然后回退到 props-default.properties if它没有找到。

If all else fails you could use two different file names, say props-default.properties inside myJar.jar and props.properties to override on the command-line. In your code, you'd try loading the props.properties file first and fallback to props-default.properties if it wasn't found.

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