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After various tests and reference Bowen
description link: https: //blog.csdn.net/qq_25014783/article/details/73522484
find classes directory because of an error or not generated .class file
After clicking the project, open the project-> Build Automatically, tick
点击项目之后，打开project->properties->java build path->source->src， 将Default output folder设置为[项目名]/WebContent/WEB-INF/classes,点击OK。
Loading a configuration file in a web project, to use the class loader methods
