Liferay Control Panel Search user Analysis

In the Liferay Control Panel, when you click the search user in the user panel:

The requests sent to the server are as follows:

Based on the configuration in Struts-config.xml, we find forward that match struts-action to/user_admin/view_users:

<action path= "/users_admin/view_users" forward= "Portlet.users_admin.view"/>

Then go to tiles-def.xml and find the page that matches forward for Portlet.users_admin.view:

<definition name= "Portlet.users_admin.view" extends= "Portlet.users_admin" > 
        <put name= "portlet_" Content "value="/portlet/users_admin/view.jsp "/> 
    </definition>

So, we found the page is/portlet/users_admin/view.jsp:

<aui:form action= "<%= portleturlstring%>" method= "get" name= "FM" > 
    <liferay-portlet: Renderurlparams varimpl= "Portleturl"/> <aui:input name= "<%= constants.cmd%>" type= "hidden" 
    /> 
    <aui:input name= "redirect" Type= "hidden" value= "<%= portleturlstring%>"/> 
     
    <% 
    Long organizationgroupid = 0; 
    %> 
     
    <c:if test= "<%= portletname.equals (portletkeys.users_admin)%>" > 
        <liferay-util: Include page= "/html/portlet/users_admin/toolbar.jsp" > 
            <liferay-util:param name= "ToolbarItem" View-all "/> 
        </liferay-util:include> 
     
        ...