Upload security is crucial to get right if you have a plan for that in your application. This video can help you to get started on the topic. Please make sure that Java servlets are old but they can still teach you a lot of things.
Links from slide show:
https://docs.oracle.com/javaee/6/tuto...
https://www.codejava.net/java-ee/serv...
https://www.opswat.com/blog/file-uplo...
https://github.com/righettod/document...
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