你需要的是 Web Tools Platform 添加到Eclipse安装中。有关如何完成此操作的信息，请参见此处

I want to develop HTML5 websites. I have already installed Java for Android development. I have Eclipse Classic 3.6 installed on my machine. Now I wish to have Java EE on the same machine. Is it possible? If so, let me know how to upgrade Eclipse Classic 3.6 to the Java EE development environment.

What you need is Web Tools Platform added to your Eclipse installation. The info on how to accomplish this can be found here