获取目录路径到.class文件包含主 [英] Getting directory path to .class file containing main

问题描述

是否可以从main中获取包含主要功能的.class文件的路径？

Is it possible to get the path to my .class file containing my main function from within main?

推荐答案

URL main = Main.class.getResource("Main.class");
if (!"file".equalsIgnoreCase(main.getProtocol()))
  throw new IllegalStateException("Main class is not stored in a file.");
File path = new File(main.getPath());

请注意，大多数类文件都汇编成JAR文件，因此在每种情况下都不起作用（因此 IllegalStateException ）。但是，您可以使用此技术找到包含该类的JAR，您可以通过代替 getResourceAsStream（）代替 getResource（），无论类是在文件系统还是在JAR中，都可以使用。

Note that most class files are assembled into JAR files so this won't work in every case (hence the IllegalStateException). However, you can locate the JAR that contains the class with this technique, and you can get the content of the class file by substituting a call to getResourceAsStream() in place of getResource(), and that will work whether the class is on the file system or in a JAR.

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