MyEclipse教学pdf

Working With Web Projects - Quickstart

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Outline

1. Preface

2. Introduction

3. Web project concepts and terminology

4. Creating a web project

5. Overview of web development productivity tools

6. Creating a JSP document

2. Test application

3. JSP debugging

8. Working with an existing web project

9. Customizing web project preferences

10.Advanced Features

1. Dependent Java project setup and deployment

2. Library deployment policy configuration

3. Adding Advanced Capabilities... to your Web Project

11.Summary

12.User Feedback

Specifically, this document presents how to:

• Create a MyEclipse Web Project

• Create a JSP using the JSP Wizard

• Editing a JSP using the JSP Editor

• Deploy, test and debug a Web Project as a web application

• Add web project capabilities to an existing Java project

• Create dependent Java projects and configure their deployment policy

• Add an external library to a Web Project and configure its deployment policy

• Customize Web Project preferences

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Figure 1 presents an annotated view of the structure of an example HelloWorld web project. Note that MyEclipse web projects are decorated with a small globe icon in the top-right corner of

a project folder, . Within this example project, two special subfolders are shown: "src" and "WebRoot" The "src " folder contains Java source code such as Java packages and their

classes and interfaces. The " WebRoot " folder is the root or base folder of a directory structure patterned after the J2EE web archive (WAR) structure . The root directory is formally known

as the web-root and it contains 3 subdirectories. Web content and resources such as JSP and HTML files, tag libraries, and JAR files are located under the web-root directory and its

subdirectories. Table-1 defines the role of the web-root subdirectories and resources.

Figure 1. Example Web Project file structure

Note: While the actual name of the web-root directory and its location within the project are user definable, its subdirectory structure must include the layout shown in Table 1.

Table 1. Web-root Description

WAR Dir. Layout WAR Elements Description

<project web-root>

The root or base directory within a Web Project under which all web content, executable and

Publicly accessible web content such as JSP and HTML files and their organizing

subdirectories typically reside directly under this folder.

WEB-INF/

A direct child directory of the web-root directory (e.g., <web-root folder>/WEB-INF). This

directory and its subdirectories contain the non-public application resources such

as deployment descriptors, tag libraries, compiled java classes, etc.

WEB-INF/classes

A child directory of WEB-INF that serves as the output location of the project's compiled Java

classes from the "src" folder(s). Contains *.class files and other non-Java resources from the

source tree. At runtime these resources are accessible from the System classpath.

WEB-INF/lib A child directory of WEB-INF that contains the project's JAR files

specific information such as the location of the web-root folder and other important details required by MyEclipse web tools for their proper operation. This file should be treated with equal

importance as the project's corresponding Eclipse .project and .classpath files. If you are maintaining your project within a source management system, e.g., CVS, include the

.mymetadata file under version control.

The optional .myeclipse folder is MyEclipse's transient work area for storing temporary data such as compiled JSPs. Since it is a temporary work area it may be created and deleted

dynamcially by MyEclipse Web Tools. You do not need to maintain this folder under your source code control system. For example, if you are maintaining your project under CVS we

recommend adding .myeclipse it the project's.cvsignore file.

The default names for the Java source and web-root folders are defined by the Web Project template. See Section 9 to learn more about customizing Web Project preferences. Figure 2,

illustrates a Web Project for which the project folder serves as the web-root folder.

Figure 2. Web Project serves as web-root folder

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The remaining fields are prepopulated from the MyEclipse Web Project Template. This template is defined under the MyEclipse J2EE Project preferences and is described in more detail

in Section 9 . Table-2 describes each of the fields for the New J2EE Web Project wizard shown in Figure 4.

Figure 4. Web Project creation details

Table 2. New Web Project wizard field definitions

Field Description

Project name The project's name. Must be a valid Eclipse Java project name.

Location

Enable checkbox to specify a custom file-system location for the new

project and its resources.

The Java source folder - will contain Java packages and *.java

path.

Web root

folder

The folder that will contain the web content, WEB-INF and its required

subfolders. If this field is empty or "/" then the project folder will serve as

the web-root folder.

Context root

URL

This is the context under which the MyEclipse Deployment Serivce will

J2EE

specification

level

Specifies the J2EE specification compliance level. Please ensure that

you select the proper specification level for the J2EE features your

application requires and that your target deployment application

server(s) support this specification level. For example, if you are

working with Tomcat 5.x or JBoss 4.x, choose J2EE 1.4 specification for

the latest J2EE capabilities. Check with your application server vendor

for information regarding J2EE specification level compliance.

Add JSTL 1.0

libraries

Enabling this option will result in the Java Standard Template Library

In Figure 4, note the J2EE 1.4 Library Container . This is a library of J2EE API Jars provided by MyEclipse to your project for compilation and code completion support. These API JAR

files are placed only on the project's build path. Note: No J2EE JAR files or other resources are physically copied into your project.

Figure 5. Newly created HelloWorld web project

Congratulations on the creation of a MyEclipse Web Project!!! The next step is to create the project's web content and functionality. Section 5 provides a brief overview of the tools you will

want to be familiar with as you develop your web application. Go to Section 6 to begin creating web content.

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5. Web Development Productivity Tools - Overview

MyEclipse provides a number of productivity tools for the development of web applications. This section outlines the key tools and their use.

• Editors

• HTML Designer (source, WYSIWYG, preview modes)