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Introducing JSP、JAVA、Tomcat

By: Gary H。 Sockut， Balakrishna R。 Iyer

Source: Beginning JSP， JSF and Tomcat

Introducing JSP and Tomcat

JavaServer Pages (JSP) is a technology that helps you create such dynamically

generated pages by converting script files into executable Java modules； JavaServer

Faces （JSF) is a package that facilitates interactivity with the page viewers; and

Tomcat is an application that can execute your code and act as a web server for

your dynamic pages.

Everything you need to develop JSP/JSF web applications is available for free

download from the Internet; but to install all the necessary packages and tools

and obtain an integrated development environment， you need to proceed with care。 There

is nothing more annoying than having to deal with incorrectly installed software。 When

something doesn’t work, the problem will always be difficult to find.

need at least 300MB of disk space for Java and Tomcat alone and twice as much

space to install the Eclipse development environment.To run all the examples

contained in this book, I used a PC with a 2.6GHz AMD Athlon 64x2(nothing fancy， nowadays)

with 1GB of memory and running Windows Vista SP2 。 Before performing any

installation， I reformatted the hard disk and re-installed the OS from the original

DVD。 I don’t suggest for a moment that you do the same！ I did it for two opposite

but equally important reasons: first, I didn’t want existing stuff to interfere

with the latest packages needed for web development; second， I didn’t want to rely

on anything already installed。 I wanted to be sure to give you the full list of what

you need。

applications are listening to one or more of those ports. To do so， open a DOS window

and type the command netstat /a. It will display a list of active connections in

tabular form。 The second column of the table will look like this：

Local Address

0。0。0。0：135

0。0.0.0:445

0.0。0。0：3306

The port numbers are the numbers after the colon. If you see one or more of

the ports Tomcat uses, after installing Tomcat， you will have to change the ports it

listens to.Here’s how to install Tomcat 7 correctly:

see three links arranged as follows： 32-bit/64-bit Windows Service Installer (pgp,

md5）.

(3）.Click on 32—bit/64—bit Windows Service Installer to download the file：

apache-tomcat-7。0.26.exe （8。2 MB）.

(4）.Before launching the installer file， you have to check its integrity. To do

so， you need a small utility to calculate its checksum. There are several freely

available on the Internet. I downloaded WinMD5Free from http://www。winmd5。com/， and

it worked for me, but this doesn’t mean I consider it better than any other

similar utility. It just happened to be the first one I saw. The program doesn't

require any special installation： just unzip it and launch。 When you open the Tomcat

installer file ， you will see a 32-digit hexadecimal number very much like

this:8ad7d25179168e74e3754391cdb24679。

(5）。Go back to the page from which you downloaded the Tomcat installer and click

(6)。Now that you have verified the correctness of the Tomcat installer， launch

it。

(7）。After you’ve agreed to the terms of the license， you will then see the dialog

shown in Figure 1—5. Click on the plus sign before the Tomcat item and select

“Service” and “Native” as shown in the figure before clicking on the “Next

>” button。

(8)。I chose to install Tomcat in the directory “C：\Program Files\Apache Software

Foundation\Tomcat” instead of the default “Tomcat 7。0". This is because sometimes

you might like to point to this directory （normally referred to as %CATALINA_HOME

％) from within a program, and one day you might replace Tomcat 7。0 with Tomcat

the examples in this book refer to port 8080. If you want, you can always change

it later to the HTTP standard port （which is 80）. As UserID/Password, you might as

well use your Windows user name and password。 It is not critical。

(10)。Lastly， you will need to provide the path of a Java Runtime Environment. This

is the path you saw when installing Java (see previous section）。 With the version of

Java I installed, the correct path is C:\Program Files\Java\jre7.

3.What is JSP

JSP is a technology that lets you add dynamic content to web pages. In absence

of JSP， to update the appearance or the content of plain static HTML pages, you always