How to dynamic assign value to the text box using struts html

<input type="text" name="usertxt" value='<bean:write name="user" property="userName"/>'>

i'm able to get value from bean using this bean tag. but i can't assign it to the text box

but i want to use struts html:text tag
so i have done the following but it's not working

<html:text property="AdminName" value='<bean:write name="user" property="userName"/>'/>

Thank u