I can use objects from my Java Beans within .jsp files by using the Expression Language (EL). Therefore I can get my value by typing ${foo.bar}. But I can also use #{foo.bar}.
我可以使用表达式语言（EL）在.jsp文件中使用Java Beans中的对象。因此，我可以输入$ {foo.bar}来获取我的价值。但我也可以使用＃{foo.bar}。
Can anybody explain the difference or provide a link with meaningful information?
任何人都可以解释这些差异或提供有意义的信息链接吗？
2 个解决方案
#1
6
#{foo.bar} syntax is from the JSF expression language. Some bright spark thought it would be a good idea to use a different syntax to JSP EL (i.e. ${foo.bar}). I think some JSP containers are tolerant of this cockup, and let you use either one.
＃{foo.bar}语法来自JSF表达式语言。一些明亮的火花认为使用与JSP EL不同的语法（即$ {foo.bar}）是个好主意。我认为一些JSP容器可以容忍这个cockup，让你使用其中任何一个。
#2
17
This is covered in the JSP 2.1 spec.
这在JSP 2.1规范中有所涉及。
In Java EE, #{expr} is used for deferred evaluation and ${expr} for immediate evaluation. Deferred expressions (#{expr}) expressions can only be used with tag attributes that accept them. This is a Java EE convention, but other domains could impose their own meaning (e.g. if you wanted to use EL in your own templates).
在Java EE中，＃{expr}用于延迟评估，$ {expr}用于即时评估。延迟表达式（＃{expr}）表达式只能与接受它们的标记属性一起使用。这是一个Java EE约定，但其他域可以强加其自己的含义（例如，如果您想在自己的模板中使用EL）。
#1
6
#{foo.bar} syntax is from the JSF expression language. Some bright spark thought it would be a good idea to use a different syntax to JSP EL (i.e. ${foo.bar}). I think some JSP containers are tolerant of this cockup, and let you use either one.
＃{foo.bar}语法来自JSF表达式语言。一些明亮的火花认为使用与JSP EL不同的语法（即$ {foo.bar}）是个好主意。我认为一些JSP容器可以容忍这个cockup，让你使用其中任何一个。
#2
17
This is covered in the JSP 2.1 spec.
这在JSP 2.1规范中有所涉及。
In Java EE, #{expr} is used for deferred evaluation and ${expr} for immediate evaluation. Deferred expressions (#{expr}) expressions can only be used with tag attributes that accept them. This is a Java EE convention, but other domains could impose their own meaning (e.g. if you wanted to use EL in your own templates).
在Java EE中，＃{expr}用于延迟评估，$ {expr}用于即时评估。延迟表达式（＃{expr}）表达式只能与接受它们的标记属性一起使用。这是一个Java EE约定，但其他域可以强加其自己的含义（例如，如果您想在自己的模板中使用EL）。