通过 sbt 打包的 one-jar 中的类路径资源 [英] Classpath resources inside one-jar packaged via sbt

问题描述

我有一个使用 SBT 构建的项目，它使用 one-jar 插件打包单个 jar.该项目在 src/main/resources/fixture 中包含一堆 json 文件，我曾经通过

I have a project that is build using SBT which packages a single jar using the one-jar plugin. That project contains a bunch of json files in src/main/resources/fixture which I used to access via

new java.io.File(App.getClass.getResource("/fixture").getFile

不幸的是，这不再起作用，因为没有返回资源.我认为 one-jar 使用了一种特殊的类加载机制?解决这个问题的最佳方法是什么?

Unfortunately this doesn't work any longer since no Resource is returned. I think one-jar uses a special classloading mechanism? Whats the best way to solve this?

推荐答案

one-jar 将您的资源打包到输出 jar 中的 main 目录下.在使用sbt的时候，我觉得最好自己配置资源的打包.通常，我会这样做:

one-jar packages your resources under the main dir in the output jar. when using sbt, I find it best to configure the packaging of resources myself. usually, I would do something like this:

unmanagedResources in Compile := Seq() //we don't want to add resources from "src/main/resources" to inner jar

mappings in oneJar += (file("src/main/resources/filename.json"),"path/to/resource/in/onejar")

所以你的资源 filename.json 将被打包到你想要的地方.当您在运行时需要资源时，只需使用:

so your resource filename.json will be packaged where you want it in the one-jar jar. when you want the resource at runtime, simply use:

Thread.currentThread.getContextClassLoader.getResourceAsStream("path/to/your/resource")

看看 这篇文章.它可能有助于如何打包 src/main/resources...

have a look at this post. it may help with how to package all the resources under src/main/resources...

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