$ {}和#{}之间有什么区别? [英] What are the differences between ${} and #{}?

问题描述

我正在用JSF2编程，并且NetBeans使用#{}创建了许多包含表达式的页面.但是有时候在网上我发现${}是同一件事！

I'm programming in JSF2 and NetBeans creates many pages with #{} that contains an expression. However sometimes on the web I found ${} for the same thing!

有什么区别吗?他们是什么?

Are there any differences? What are they?

推荐答案

• #{}用于 延迟表达式 (已解决) 取决于页面的生命周期)，可用于阅读或 从 bean 写入或写入方法.
• ${}是用于 立即解决 的表达式 遇到他们就解决了.它们是只读的.
• #{} are for deferred expressions (they are resolved depending on the life cycle of the page) and can be used to read or write from or to a bean or to make a method call.
• ${} are expressions for immediate resolution, as soon as they are encountered they are resolved. They are read-only.

您可以在此处了解更多信息: http://docs.oracle .com/javaee/6/tutorial/doc/bnahr.html

You can read more here: http://docs.oracle.com/javaee/6/tutorial/doc/bnahr.html

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