Getting started with jsp Directives Implicit objects Creating custom tag libraries using JSP 2.0(Without java classes)Comments in JSP

Comments in JSP

Remarks:

To see the source code of java class translated by container of JSP page:

Eclipse: WORKSPACE\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\work\Catalina\localhost\PROJECT_NAME\org\apache\jsp\PAGENAME_jsp.java

Netbeans: Right-click on page and select view servlet

JSP Comments Example

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html">
<title>JSP Comments</title>
</head>
<body>
    <%-- JSP comments --%> -- Ignored by container, you can't see this comment in source code of JSP_java class translated by container, doesn't include in response

    <!-- HTML comments --> -- Ignored by browser, You can see this comment in source code of html page but browser ignores it to print on page, included in response

    <% // java comments %> -- Ignored by JRE, This comment can be seen in JSP_java class translated by container, doesn't include in response
    
    <!-- Today is <%= new java.util.Date() %> -->
    
</body>
</html>

When you run above code, output will be a blank page. To understand difference between these comments you need to see the source of web page and source code of JSP_Java class translated by container.

HTML comment in a JSP

You can include HTML comments in JSPs as well. You use the basic html comment syntax:

<!--Comment goes here-->

The difference between using JSP style comments and HTML style comments is the JSP ones will not be included when the HTML is generated and the HTML style comments will be. So it depends if you want them to be seen if someone views the source HTML.

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Topic Id: 9040

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