1、https://www.oracle.com/index.html
2、https://www.oracle.com/downloads/index.html
3、https://www.oracle.com/technetwork/java/javase/downloads/index.html
4、https://www.oracle.com/technetwork/java/javase/archive-139210.html
5、https://www.oracle.com/technetwork/java/javase/downloads/java-archive-downloads-javase7-521261.html
6、