Eclipse is an open source IDE (Integrated Development Environment) for developing applications in Java, C/C++, HTML, Cobol, Perl, etc.
The official Eclipse web site (eclipse.org) says, “Eclipse is a kind of universal tool platform -- an open extensible IDE for anything and nothing in particular.”
Building a J2EE Web Application with Eclipse
• Provides a consistent feature set on most platforms
• Supports more than just Java or any single language
• Open source and free, yet fully supported
• Truly extensible and configurable
• Industrial strength
Building a J2EE Web Application with Eclipse
Eclipse:
Web browserWeb server
HTML
request
Scripted page database
Recall the typical dynamic web application consists of a web browser, web server, html pages, server pages, and a database
Eclipse can be used to create the HTML pages, Server Pages, Database Tables, and test it all using a Web Server and a internal web browser.
Overview of a Typical Web Application
HTML
Web browserWeb server
HTML
request
Scripted page database
The following components are used:
Apache Jakarta Tomcat servlet engine
Derby
JavaServer Pages Standard Tag Library (JSTL)
WTP (Web Tools Project Plugin)
Eclipse support for creating an Testing Web Applications
HTML
Web browserWeb server
HTML
request
Scripted page database
The following components will be used:
Apache Jakarta Tomcat servlet engine
Derby
JavaServer Pages Standard Tag Library (JSTL)
WTP
Apache Jakarta Tomcat servlet engine
Derby
JavaServer Pages Standard Tag Library (JSTL)
Eclipse support for creating an Testing Web Applications
Internet Explorer, Firefox, or internal browser
HTML
Building J2EE Web Applications with Eclipse
When Eclipse is started, it asks you to choose a workspace. The workspace is the location on the filesystem (folder, directory) where your files will be stored. Afterwards you are presented with the Welcome screen if this is your first time using this workspace.
Building J2EE Web Applications with Eclipse
Eclipse is divided into Perspectives and Views. A Perspective is the set of screens and functionality for a particular development scenerio (Java, C++).
To build a Web Application, first set the perspective to J2EE by selecting Window -> Open Perspective -> Other
Building a J2EE Web Application with Eclipse
Next Create a Dynamic Web Project by selecting New -> Dynamic Web Project
Building a J2EE Web Application with Eclipse
Type in a name for the Project. In this case it is FirstWebProject and press Finish.
(May be asked to configure a Server)
Building a J2EE Web Application with Eclipse
A folder will be created for your Project, appearing under Dynamic Web Projects
Web browserWeb server
HTML
request
Scripted page database
The following components will be used:
Apache Jakarta Tomcat servlet engine
Derby
JavaServer Pages Standard Tag Library (JSTL)
WTP
Apache Jakarta Tomcat servlet engine
Derby
JavaServer Pages Standard Tag Library (JSTL)
Eclipse support for creating an Testing Web Applications
Internet Explorer, Firefox, or internal browser
DERBY
http://db.apache.org/derby
- Relational Database implement in Java
- Open source version of IBM Cloudscape
- Small footprint
- Provides an embedded driver
Using the Derby Database for Persistent Data
Adding the Apache Derby Nature to the project makes the class files and tools for Derby available to the Project.
Using the Derby Database for Persistent Data
Start the Derby Server by right-clicking on the Project and selecting Apache Derby -> Start Derby Network Server. Select Ok when the dialog box appears.
Using the Derby Database for Persistent Data
To create a Database, create a script file and execute it. To create the file, right-mouse click on the project and choose New -> File
Using the Derby Database for Persistent Data
Type the SQL for creating the table and inserting data.
Using the Derby Database for Persistent Data
To execute the script, right-mouse click on the script file, choose Apache Derby -> Run SQL Script using ‘ij’
Using the Derby Database for Persistent Data
The console shows the results of executing the script file.
There is a Database Explorer for further manipulating the database.
Web browserWeb server
HTML
request
Scripted page database
The following components will be used:
Apache Jakarta Tomcat servlet engine
Derby
JavaServer Pages Standard Tag Library (JSTL)
WTP
Apache Jakarta Tomcat servlet engine
Derby
JavaServer Pages Standard Tag Library (JSTL)
Eclipse support for creating an Testing Web Applications
Internet Explorer, Firefox, or internal browser
HTML
Creating HTML Pages / Server Pages
To create a HTML page, right-click on the project and select New -> HTML
To view the page in a web browser, choose right-mouse click on the editor and choose Run As -> Run on Server. This will start Tomcat (if it is not started) and open the file in the browser.
Creating HTML Pages / Server Pages
(May have to choose Server and select Projects to add to the Server)
Creating HTML Pages / Server Pages
To change the web browser Eclipse uses, choose Window -> Preferences -> General -> Web Browser -> Use External browser, and choose the browser you would like used to display the pages (IE, Firefox, etc).
Creating HTML Pages / Server Pages
Here’s what we have so far, viewed with the internal web browser. Selecting the Add Account hyperlink takes us to the addaccount.html page.
Web browserWeb server
HTML
request
Scripted page database
The following components will be used:
Apache Jakarta Tomcat servlet engine
Derby
JavaServer Pages Standard Tag Library (JSTL)
WTP
Apache Jakarta Tomcat servlet engine
Derby
JavaServer Pages Standard Tag Library (JSTL)
Eclipse support for creating an Testing Web Applications
Internet Explorer, Firefox, or internal browser
HTML
JSTL (JavaServerPages Standard Tag Library)
The JSP Standard Tag Library (JSTL) is a collection of custom tag libraries that implement general-purpose functionality common to Web applications, including iteration and conditionalization, data management formatting, manipulation of XML, and database access.
• Core Tag Library – looping, expression evaluation, basic input/output
• Formatting/Internationalization Tag Library – parsing data, such as dates.
• Database Tag Library – tags that can be used to access SQL databases
• XML Tag Library – tags can be used to access XML elements
JSTL (JavaServerPages Standard Tag Library)
<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>
<html>
<head>
<title>Count to 10 Example (using JSTL)</title>
</head>
<body> <c:forEach var="i" begin="1" end="10" step="1">
<c:out value="${i}" />
<br />
</c:forEach>
</body>
</html>
Core Tag Library Example
JSTL (JavaServerPages Standard Tag Library)
<%@taglib uri="http://java.sun.com/jsp/jstl/sql" prefix="sql"%>
<sql:query var="cities">
SELECT CITY_NAME, COUNTRY, AIRPORT FROM APP.CITIES ORDER BY \
CITY_NAME, COUNTRY
</sql:query>
<c:forEach var="city" items="${cities.rows}">
<c:out value="${city.airport}” />
<c:out value=“${city.city_name}” />
<br/>
</c:forEach>
Database Tag Library