<filter>
    <filter-name>struts2</filter-name>
    <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>struts2</filter-name>
   <url-pattern>*.action</url-pattern>
</filter-mapping>

1、配置struts.xml时Action中不配置namespace，默认namespace为 “ ”

struts.xml中

<package name="test" extends="struts-default" >

    <action name="init_action" class="com.wei.action.LoginAction" method="init">
    <result>/login.jsp</result>
    </action>
</package>

jsp中

<form action="init_action.action" method="post">
    用  户  名：<input type="text" name="user" value="" maxlength="20" size="20"><br>
    密       码： <input type="password" name="pwd" value="" maxlength="20" size="20"><br>
    确认密码：<input type="password" name="pwd" value="" maxlength="20"size="20"> <br>
    <input type="submit" name="login" value="http://www.mamicode.com/登录">
</form>

2、配置struts.xml时Action中配置namespace=“/test ”

struts.xml中

<package name="test" extends="struts-default"  namespace=/test“”>

    <action name="init_action" class="com.wei.action.LoginAction" method="init">
        <result>/login.jsp</result>
    </action>
</package>

jsp中

<form action="test/init_action.action" method="post">
    用  户  名：<input type="text" name="user" value="" maxlength="20" size="20"><br>
    密       码： <input type="password" name="pwd" value="" maxlength="20" size="20"><br>
   确认密码：<input type="password" name="pwd" value="" maxlength="20"size="20"> <br>
    <input type="submit" name="login" value="http://www.mamicode.com/登录">
</form>

欢迎交流，评论！

配置struts时web.xml中<url-pattern>*.action</url-pattern>