chinabugotech/hutool ? reverse-engineered prompt

Build me a Java utility library for common everyday developer tasks, like strings, dates, files, collections, encoding, JSON, HTTP calls, logging, encryption, caching, scheduled jobs, database helpers, and a few extra tools like captcha, JWT, and socket support. I want it to be easy to drop into other projects, work on JDK 8 and above, and let people either use one big all in one package or pick just the pieces they need.

Please make it feel polished and practical, with clear examples and helpful comments, since this is meant to be something people can learn from as well as use. Keep it lightweight and dependency free where possible, and make sure the modules are separated cleanly so the codebase is easy to maintain. If you need to check current best practices or APIs, look them up online first.