Java Server Pages

Chapter 5. Generating Dynamic Content

JSP is all about generating dynamic content: content that differs based on user input, time of day, the state of an external system, or any other runtime conditions. JSP provides you with lots of tools for generating this content. In this book, you will learn about all of them—standard actions, custom actions, JavaBeans, and scripting elements. Before we do that, however, let’s start with a few simple examples to get a feel for how the basic JSP elements work.

In this chapter, we develop a page for displaying the current date and time, and look at the JSP directive element and how to use JavaBeans in a JSP page along the way. Next, we look at how to process user input in your JSP pages and make sure it has the appropriate format. We also look at how you can convert special characters in the output, so they don’t confuse the browser.

What Time Is It?

Recall from Chapter 3, that a JSP page is just a regular HTML page with a few special elements. JSP pages should have the file extension .jsp , which tells the server that the page needs to be processed by the JSP container. Without this clue, the server is unable to distinguish a JSP page from any other type of file and sends it unprocessed to the browser.

When working with JSP pages, you really just need a regular text editor such as Notepad on Windows or Emacs on Unix. Appendix E, however, lists a number of tools that may make it easier for you, such as syntax-aware editors that color-code JSP and ...