Struts2中的constant标记

Constant

In the various XML variants, the constant element has two required attributes: name and value.

Attribute	Required	Description
name	yes	the name of the constant
value	yes	the value of the constant

In the struts.properties file, each entry is treated as a constant.

In the web.xml file, any FilterDispatcher initialization parameters are loaded as constants.

用法举例：

<constant name="struts.devMode" value="true" />

constant标记能够覆写定义在default.properties文件中的属性，就像上面设置的struts.devMode属性