Request.getparameter with same name problem

hi all ,
can u please help me,
my code ->
<form>
<input type= "hidden" name= "mid" id = "mid" value = "search" />
</form>
and m redirecting this jsp to another with url
showDetails.jsp?mid="hello";
String str[] = request.getParameterValues("mid");
this str contains only hidden parameter value ie. search
but i also want value appended to url
can u please tell me how thats possible ?
i don't want to use request.queryString() that is not a good answer.
please tell me

If you want to assign multiple parameter values to the same parameter name in a query string, you need the array notation. E.g. foo.jsp?name[]=value1&name[]=value2

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