[JAVA] How to send value in HTML without screen transition

It is a memo of how to send the value by GET without screen transition.

GET value sent in HTML

a href = "URL? Attribute name =" value "

<body>
<a href="TestServlet?action=sample"></a>
</body>

Receive value in Java

request.getParameter ("attribute name") s receives the string "sample".

protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

			String s = request.getParameter("action");

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