官网java8: https://www.oracle.com/java/technologies/javase/javase8-archive-downloads.html
其他版本下载:https://www.oracle.com/java/technologies/downloads/archive/
官网java8: https://www.oracle.com/java/technologies/javase/javase8-archive-downloads.html
其他版本下载:https://www.oracle.com/java/technologies/downloads/archive/