Apache Commons Lang https://commons.apache.org/proper/commons-lang/
Apache commons-math (数值计算) http://commons.apache.org/proper/commons-math/index.html
apache.httpcomponents http://hc.apache.org/dev-docs.html
jodd https://jodd.org/
hutool https://hutool.cn/docs/#/
guava http://ifeve.com/google-guava/
gson https://github.com/google/gson