Java历史版本官方下载地址

Java 6官方下载地址
https://www.oracle.com/java/technologies/javase-java-archive-javase6-downloads.html

Java 7官方下载地址
https://www.oracle.com/java/technologies/javase/javase7-archive-downloads.html

Java 8官方下载地址
https://www.oracle.com/java/technologies/javase/javase8-archive-downloads.html