About Java Project Source folder compiled path problem (class load path problem) __java

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First, let's look at the engineering directory structure:

When we do mybatis, we read the sqlmapconfig.xml under another Sourcefolder config in one of the packages below SRC and read it directly like the files in this directory.
In fact, look at the project after compiling the directory structure at a glance:

You can see that there is a bin, then what is this, look at:

It's clear that all files and folders under All source folder (src Config test) are compiled into the bin (which is published to the/web-inf/classes side in the Javaweb environment). And this is the Java boot directory, so directly write the file name can be directly read