首先你应该去掉动作扩展，如果你不想让用户认为他们的名字有扩展名.

First of all you should get rid of action extension, if you don't want user to think their name has an extension.

<constant name="struts.action.extension" value=",,action"/> 

接下来的模式匹配器应该是regex.

Next the pattern matcher should be regex.

<constant name="struts.patternMatcher" value="regex"/>

动作映射

<action name="/CustomURL/{username}" class="com.rajesh.struts2.CustomURL" method="customUrl">
    <result name="success">welcome.jsp</result>
</action>

在JSP 中你不需要使用form 标签，而是使用anchor 标签.并使用已知名称.

In the JSP you don't need to use form tag, but anchor tag. And use known names.

<a href="http://localhost:8080/CustomURL/rajesh">Click my name</a>