[SpringFramework]Input태그의 입력 비활성화_readonly

1. Input태그에 고정 값만넣고 입력을 비활성화: 

<form method="post">
	<label>제목</label>
	<input type="text" id="title" name="title" /> <br>
	<label>작성자</label>
	<input type="text" id="writer" name="writer" value="${userid}" readonly/> <br>
	<label>내용</label><br>
	<textarea rows="10" cols="40" name="content"></textarea> <br>
	
	<hr>
	<button id="submit" type="submit">등록</button>
</form>