java - How to add id to action in HTML.form -

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i have form:

<form method="post" action="/user/${id}">     <input type="text" value="${id}" placeholder="input id">     <button>get user</button> </form>

i need add input data uri, /user/23, 23 in inputed data.

do need have /user/23 uri? if don't, can use "/user/" action. 

<form method="post" action="/user">     <input type="text" name="user_id" placeholder="input id">     <button>get user</button> </form>

then can get/handle proper id. like:

<%= request.getparameter("user_id")%>

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