Rails把java的方式戏称为XML仰卧起坐（sit-ups）。
Rails是一个完整的，开源的web开发框架，更多的快乐和更少的代码。
贯穿整个框架的是DRY(不要重复)原则，具体体现比如：定义好数据库表后，类名字和对象属性名字都自动确定了。用过hibernate的朋友知道我在说什么(你也许会说xdoclet, 那不也得学吗)。
学习成本低，不需要学习各种XML花式（学习过struts,spring,hiber,webwork,ant,maven的朋友知道我在说什么），只需要学习Ruby语言就够了。
编程的快乐又回来了，没有编译和部署，即改即得，所有的复杂都隐藏在框架内部了。
你感受到它的哲学了吗？自己安装试试看吧。
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作为对照，以下文字来自rails网站首页：
Rails is a full-stack, open-source web framework in Ruby for writing real-world applications with joy and less code than most frameworks spend doing XML sit-ups
Being a full-stack framework means that all layers are built to work seamlessly together. That way you Don’t Repeat Yourself (DRY) and you can use a single language from top to bottom. Everything from templates to control flow to business logic is written in Ruby—the language of love for industry heavy-weights.
In striving for DRY compliance, Rails shuns configuration files and annotations in favor of reflection and run-time extensions.
This means the end of XML files telling a story that has already been told in code. It means no compilation phase: Make a change, see it work. Meta-data is an implementation detail left for the framework to handle.