Welcome to Java News Today in Java

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14 Welcome to Java News Today
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Throughout this book, we will be following the evolution of a fictional Web site called Java News Today JNT is a start-up company of Java enthusiasts who want to create a compelling, up-to-the-minute site covering all things Java Because it wants to attract and maintain an audience, JNT will make its site as dynamic as possible In addition to updating the content frequently, the site is to have games, polls, search functionality, and other interactive features JNT also considers it very important to allow users to customize and adjust the site to fit their own needs The folks at JNT hope that lots of users will make JNT their home page and that no users will move into a home they cannot decorate themselves Everyone at JNT will openly admit to being a fan of the Slashdot site, at http://wwwslashdotorg, and the Java Lobby, at http://wwwjavalobbyorg Readers familiar with those sites may notice some similarities in the features that JNT is trying to build But then, imitation is the sincerest form of flattery
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15 Trying the Examples
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All the examples in this book have been included on the companion CD-ROM, so readers can see them in action and experiment with changes The CD-ROM also includes Tomcat, the high-performance JSP engine provided for free by the Apache project, at http://jakartaapacheorg The version included is 50, the first implementation of the JSP 20 and servlet 13 specifications The CD-ROM also includes a number of third-party libraries that provide useful utilities These libraries include HypersonicSQL, a file-based database written in Java; Jaxen, a set of Java classes for working with XML; and the Canetoad utilities, which provide a number of utilities for working with beans
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Instructions for installing and running the examples can be found in the indexhtml file on the CD-ROM Most users can simply double-click this file to get started
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2 Simple JSPs
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1 presented the case for dynamic sites and surveyed a number of techniques for building such sites, focusing on the strengths of JavaServer Pages technology With these preliminaries out of the way, everything is in place to start creating some pages! This chapter begins by introducing some of the simpler features of JSPs It is a time-honored tradition for computer books to start with an example that allows the system being studied to introduce itself This book is no exception, so without further delay, Listing 21 contains our first JSP Listing 21 A simple JSP
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<html> <!-- Our first JavaServer Page --> <body> Hello, world! </body> </html>
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This may look like a plain old chunk of HTML, not a very interesting one at that However, when saved in a file called indexjsp and given to a JSP engine such as Tomcat, this chunk of HTML becomes much more than a static block In fact, this is a program very similar to the programs in Listings 12 and 13 As a program, this file contains a series of instructions that the JSP engine will follow Written out in English, these instructions are equivalent to the following:[1]
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This isn't quite true For the sake of efficiency, most JSP engines send out contiguous chunks of HTML all at once
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However, it is often helpful to think of JSPs as being processed one line at a time
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1 2 3 4 5 6
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Send the text <html> to the user Send the text <!-- Our first JavaServer page --> to the user Send the text <body> to the user Send the text Hello, world! to the user Send the text </body> to the user Send the text </html> to the user
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More technically, a program called the page compiler converts the original file into another little Java program, a servlet as discussed in Section 13 This servlet is what gets run Servlets are an important technology, and they are covered in more detail in 11 For the time being, these details are unimportant, and it is perfectly reasonable to think of the JSP file itself as the program At this point, three different things are all going by the name indexjsp One is the original file, sitting in a directory from where it can be edited like any other file Second is the servlet, which is managed by the JSP engine and is generally not meant to be seen directly Third is the URL and the corresponding page as seen in a browser To avoid confusion, the specific meaning will always be indicated when it is not clear from the context In this particular case, all the extra work of creating and running a program has not accomplished anything However, the translation has not been pointless, as it has created a program from HTML This is why JSP authors generally do not need to do much programming themselves The JSP engine is quite sophisticated and can turn a few simple tags into very complex code The servlet that is generated and the environment in which this code runs are also very sophisticated, which removes even more of the programming burden This program illustrates two of the basic rules for the JSP programming language: 1 Plain text turns into a command to send that text to the user 2 Regular HTML tags turn into a command that sends that tag to the user
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