Programming for beginners: jsp Comments

Comments makes the program more readable. Suppose you wrote a thousand lines of program, with out proper documentation, after some time, for the owner of the application also, it is very difficult to figure out what was written.

JSP supports two types of comments.

a. Hidden Coments

b. HTML style comments

Hidden comments are available to jsp page itself. They are not visible out side.

Syntax

<%-- This is a hidden JSP comment --%>

HTML style comments are passed to the response output stream and are included in the generated HTML.

Syntax

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@page import="java.util.*"%>

<%-- This is a hidden JSP comment --%>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>Generate Random Number</title>
    </head>
    <body>
        <!-- This is included in the generated HTML-->
        <h1>Random Number:
            <%
                Random rand = new Random();
                out.print(rand.nextInt());
                
            %>
        </h1>
    </body>
</html>

Run the above jsp and right click on the browser and see the view source of this page. Observe the below image, Hidden comments are not available in the source of this jsp page.

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Programming for beginners

Sunday 8 March 2015

jsp Comments

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