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Parameters after the action name

To use parameters in the URL, after the action name, make sure this is set:

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When a URL like /edit/person/123 is requested, EditAction will be called, and its "id" field will be set to 123.

Advanced Wildcards

From 2.1.9+ regular expressions can be defined defined in the action name.

The regular expressions can be in two forms, the simplest one is {FIELD_NAME}, in which case the field with the FIELD_NAME in the action will be populated with the matched text, for example:

<package name="books" extends="struts-default" namespace="/">
    <action name="/{type}/content/{title}" class="example.BookAction">
	<result>/books/content.jsp</result>
    </action>
</package>

In this example, if the url /fiction/content/Frankenstein is requested, BookAction's field "type" will be set to "fiction", and the field "title" will be set to "Frankenstein".

The regular expression can also be in the form {FIELD_NAME:REGULAR_EXPRESSION}. The regular expression is a normal Java regular expression. For example:

<package name="books" extends="struts-default" namespace="/">
    <action name="/{type}/{author:.+}/list" class="example.ListBooksAction">
	<result>/books/list.jsp</result>
    </action>
</package>

In this example, if the url /philosophy/AynRand/list is requested, ListBooksAction's field "type" will be set to "philosophy" and "author" to "AynRand".

The matched groups can still be accessed using the {X} notation, like:

<package name="books" extends="struts-default" namespace="/">
    <action name="/books/{ISBN}/content" class="example.BookAction">
	<result>/books/{1}.jsp</result>
    </action>
</package>

Next: Application Servers