How to download offline javadoc?

For Java SE 6, SE 7 and SE 8:
http://www.oracle.com/technetwork/java/javase/downloads/index.html#docs
Direct link for SE 6: 
http://www.oracle.com/technetwork/java/javase/downloads/jdk-6u25-doc-download-355137.html
Direct link for SE 7: 
http://www.oracle.com/technetwork/java/javase/documentation/java-se-7-doc-download-435117.html
Direct link for SE 8:
http://www.oracle.com/technetwork/java/javase/documentation/jdk8-doc-downloads-2133158.html
The download link and other documentation can be found on this page: 
http://docs.oracle.com/javase/8/docs/
中文版API文档

在百度中输入关键字“Java EE APIs Docs chinese”，结果中找到如下页面：

 


终于找到你，中文版下载连接http://download.oracle.com/technetwork/java/javase/6/docs/zh/api.zip