获取类路径中的所有类 [英] Get all of the Classes in the Classpath

问题描述

如何获取 CLASSPATH 在运行时?
在 Eclipse IDE 中，您可以通过按 Ctrl+Shift+T 来执行此操作.
Java 中有什么方法可以完成它吗?

How can I get list of all available classes in CLASSPATH at runtime?
In Eclipse IDE, you can do this by pressing Ctrl+Shift+T.
Is there any method in Java to get it done?

推荐答案

您可以通过向 ClassLoader#getResources().

You can get all classpath roots by passing an empty String into ClassLoader#getResources().

Enumeration<URL> roots = classLoader.getResources("");

您可以构建一个File 基于URL 如下:

You can construct a File based on URL as follows:

File root = new File(url.getPath());

您可以使用File#listFiles() 获取给定目录中所有文件的列表:

You can use File#listFiles() to get a list of all files in the given directory:

for (File file : root.listFiles()) {
    // ...
}

您可以使用标准的java.io.File 方法来检查它是否是一个目录和/或获取文件名.

You can use the standard java.io.File methods to check if it's a directory and/or to grab the filename.

if (file.isDirectory()) {
    // Loop through its listFiles() recursively.
} else {
    String name = file.getName();
    // Check if it's a .class file or a .jar file and handle accordingly.
}

根据唯一的功能要求，我猜 Reflections 库 更准确你想要什么.

Depending on the sole functional requirement, I guess that the Reflections library is much more exactly what you want.

这篇关于获取类路径中的所有类的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！