How to map URL like “/user/{user_id}” to a specific action?

Question

How could I map a regex number class (\\d) to an action?

Example:

/user/123 , /user/345,  /user/546456 ....

Answer 1

With Advanced Wildcards :

Advanced Wildcards

From 2.1.9+ regular expressions can be defined defined in the action name. To use this form of wild card, the following constants must be set:

 <constant name="struts.enable.SlashesInActionNames" value="true"/> <constant name="struts.mapper.alwaysSelectFullNamespace" value="false"/> <constant name="struts.patternMatcher" value="regex" /> 

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 ".

Note that if you need those parameters in prepare() method, you need a tuned up Interceptor Stack .