java - 如何将 "/user/{user_id}"之类的 URL 映射到特定操作？

Question

如何将正则表达式数字类 (\d) 映射到操作？

示例:

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

Answer 1

与 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".

请注意，如果您需要在 prepare() 方法中使用这些参数，you need a tuned up Interceptor Stack .