Java反编译工具在Eclipse下可以选择Eclipse-Class-Decompiler插件, 他是集成了很多工具，有jd，jad，crf等。
Java反编译工具
参考链接：Eclipse-Class-Decompiler https://www.eclipse.org/community/eclipse_newsletter/2017/february/article8.php
github下载地址 https://github.com/cnfree/Eclipse-Class-Decompiler/releases/download/v2.10.0/eclipse-class-decompiler-update_v2.10.0.zip
wiki https://en.wikipedia.org/wiki/Java_Decompiler
其他 https://marketplace.eclipse.org/content/enhanced-class-decompiler