Scala is clearly an interesting language, well suited for showing off nifty new ideas in language theory and innovation. This article serve as a gentle introduction to the idea of using Scala for Web applications and demonstrate that Scala’s features can be leveraged in some interesting ways to make programming for the JVM easier.
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In our previous tutorial, we showed how to create dynamic images images in a servlet. In this tutorial, we are going to take it a step further by dynamically adding a text watermark to an image as it is requested.
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This tutorial helps you to understand: What is JSTL? Installing JSTL 1.0; Implementation – Standard Taglib 1.0.4; ‘Hello world!’ with JSTL; JSTL in XML Style JSP Pages; JSTL Requirements.
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Dynamic images are commonly used in web applications. You will find dynamic images such as charts, captcha, web site thumbnails, image thumbnails, watermarks, etc. This tutorial will give you a brief walk through on creating a simple dynamic images in a Java Servlet.
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This tutorial helps you to understand:

HTTP Response Syntax
HTTP Response Header Lines
Controlling Response Header Lines
Viewing Response Header Lines
Response Header Lines of Static Files
Response Header Lines Affected by jsp:directive.page Elements
Setting Header Lines Directly in JSP Pages
Generating Non-HTML Entity Body
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