Java SPI - ServiceLoader - 将多个JAR添加到APP类路径 [英] Java SPI - ServiceLoader - adding multiple JAR's to APP classpath

问题描述

我在项目中实现此逻辑时遇到问题。我使用ServiceLoader，我不知道，或者它是否可能，但我想动态地将JAR添加到app的某个已知目录，因此应用程序可以在启动时加载它们。我唯一获得的是我知道如何创建可扩展的ONE JAR（使用META-INF / services），因此我可以为此JAR添加越来越多的提供者和类（实现）。 JAR包含在类路径中，就像普通的库一样，所以app知道它。我想要实现的目标：
我不想扩展一个jar文件，但我希望通过添加更多jars（如插件与提供程序（服务）来扩展应用程序，但我不知道如何。

I have a problem implementing this logic in my project. Im using ServiceLoader and I don't know or if it's even possible, but I want to dynamically add JARs to some known directory for app, so the app can load them when it starts. The only thing I achieved was that I know how to create extensible ONE JAR (with META-INF/services), so I can add more and more providers and classes (implementations) to this JAR. The JAR is included to classpath like ordinary library, so app knows about it. What I want to achieve: I don't want to extend one jar file, but I want to extend app by adding more jars like plugins with providers (services), but I don't know how.

感谢您的帮助！

推荐答案

您只需要（a）URLClassLoader即可使用这些目录中所有JAR文件的URL构造，并且（b）调用 ServiceLoader.load（Class service，ClassLoader loader）。

You just need (a) a URLClassLoader that is constructed with the URLs of all the JAR files in those directories, and (b) call ServiceLoader.load(Class service, ClassLoader loader).

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