April 2003
Intermediate to advanced
304 pages
7h 48m
English
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Getting Started with J2EE
When starting a new application or development environment, first build the proverbial “Hello World” example. This step is instructional when working with J2EE, as it was for JSP in Chapter 13.
“Hello World” in J2EE
Start by building the simplest of all possible web applications: a “Hello World” JSP file. You created a similar JSP in the last chapter, but deploying a JSP as part of a J2EE application is different from deploying a JSP as a simpler web application. You will get a feel for these differences by working through these basic steps.
Create a file called index.jsp, with the contents shown in Example 14-1.
Example 14-1. A Hello World JSP
<HTML>
<HEAD>
<TITLE>Test</TITLE>
</HEAD>
<BODY>
Hello World!<BR>
<%= new java.util.Date().toString( ) %>
</BODY>
</HTML>To deploy this file, create a WAR file. A WAR is just a ZIP file with a specific encoding, and in this case you can get away with not creating a web.xml file or any other supporting configuration or property files. Copy the index.jsp file to the /usr/local/jboss/server/default/deploy directory, and then issue the following command:
[Localhost:~/Documents] wiverson% ls index.jsp index.jsp [Localhost:~/Documents] wiverson% zip test.war index.jsp adding: index.jsp (deflated 19%) [Localhost:~/Documents] wiverson% mv test.war /usr/local/jboss/server/default/deploy/ [Localhost:~/Documents] wiverson%
This command creates the needed WAR file and places it in JBoss’s deployment directory (/usr/local/jboss/server/default/deploy ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.