Three ways to load external files in Javaweb

1.request.getsession (). Getservletcontext (). getResourceAsStream ("/web-inf/classes/a.txt" ");

/relative to the root path of the project

2.getClass (). getClassLoader (). getResourceAsStream ("/a.txt")

/whether or not '/' is relative to the classpath path (/web-inf/classes/)

3.getClass (). getResourceAsStream ("/a.txt")

If there is a '/' relative to the classpath path, if there is no corresponding location relative to the class file.

Note: Classpat here refers to the WEB project after it was published/web-inf/classes/

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Three ways to load external files in Javaweb