Creating Your Working Environment in Java Integrate UPC-A in Java Creating Your Working Environment

How to generate, print barcode using .NET, Java sdk library control with example project source code free download:
2. using barcode printing for servlet control to generate, create universal product code version a image in servlet applications. Microsoft Office Development. Microsoft Office 2000/2003/2007/2010 When the debu upc barcodes for Java gging is over, press Ctrl + F2. You might want to switch back to the Java EE perspective (there is a control for switching perspectives in the top right corner of Eclipse"s window). From here, we can continue developing the application, debugging it when necessary and this is exactly what we are going to do in the chapters that follow.

. [ 45 ]. Creating Your Working Environment Summary. The easiest w UPC-A for Java ay to create a foundation for a Tapestry project is to use Maven, a popular project management tool. Maven will create a complete skeleton of the project, with all necessary files and libraries already in place. All we need to do is to download Maven, unpack it and then add its location to the system"s PATH variable.

We could continue to use Maven to compile, build and deploy an application as we develop it, but it is more convenient and efficient to use an integrated development environment. There are two powerful, convenient and completely free integrated development environments available NetBeans and Eclipse. It is actually a matter of taste which of them to use.

My opinion is that NetBeans is better for beginners, as it brings all the necessary ingredients in one convenient package. If you have chosen Eclipse, I advise you to use the Eclipse WTP package, not the bare-bones version. In both NetBeans and Eclipse, you can easily make use of the project skeleton created by Maven.

You can run the project on the server, updating it when you make some changes, and you can debug the project simply and naturally, as if this were a desktop application.. In the next c hapter, we are going to learn the main concepts of Tapestry as a framework. Its ideas are very natural, but, on the other hand they can be quite innovative, and it is important to understand them when working on a Tapestry project. The discussion that follows isn"t going to be a boring theory, as we are going to learn the concepts while playing with a Tapestry application, the foundation for which we have created in this chapter.

. [ 46 ]. The Foundations of Tapestry In this chapt jboss upc a er we are going to learn the following concepts: A Tapestry application is a set of interactive pages maintained and managed by the framework. Each page consists of a page template, which is an XML document, and a page class, which is a POJO (Plain Old Java Object, meaning that it doesn"t have to inherit from other classes or implement any interface). A Tapestry page can contain extensions and components.

We are going to learn almost everything about extensions and introduce a few components, leaving a proper discussion of components for the next two chapters. It is important to understand in rough detail the life cycle of a Tapestry page, and how components on a page in a user"s web browser are connected to the properties of the page class. We can easily navigate from one page to another in a Tapestry application, and there are a few ways how we can do that.

Tapestry applications can be easily structured according to our needs, and we are going to find out how to keep pages in order by putting them into different subdirectories. Any web application needs to remember many things about the current user and his or her choices. We are going to have a look at how an application"s state is managed by Tapestry.

. Quite a subst antial plan for one chapter, but I hope you will enjoy going through it step-by-step. Let"s begin..

The Foundations of Tapestry Tapestry Application is a Set of Interactive Pages It is natural spring framework UPC A for a user of a web application to think of it as a set of pages. The user might click on a button, select a value in a drop-down list or do something else, and the page would display different data, or even a completely different page might be shown by the application as a result of user actions. The design of Tapestry is very close to this natural paradigm, as a Tapestry application actually consists of a number of Tapestry pages.

A Tapestry page is quite a clever entity. It remembers the values entered by the user, and if the user initiates some action, like clicking on a link or clicking on a button, the page will react to that action by running an appropriate fragment of code an event handler method. It is for us developers to decide what kind of code it will be and how it will use the input provided by the user.

This will sound very familiar to those who have experience of developing desktop applications with some Rapid Application Development environments, such as Borland Delphi or Microsoft Visual Basic. However, web applications are very different from desktop applications, and although working with Tapestry we do not need to deal with complexities that arise from this difference, it is useful to understand how things work, at least in general terms. Let"s say that a Tapestry application is deployed on a web server in the USA, while the user who came to try the application is in Australia.

What the user actually sees in his or her web browser is a piece of HTML, perhaps enhanced with images, JavaScript, and styles, but basically this is just a snapshot. It is just one moment in the life of the real Tapestry page, an entity that lives on the server. When the web server receives a request from a user, it uses an appropriate Tapestry page to generate some output some HTML page to be sent to the user.

When the user does something with the received HTML page, like putting some data into text boxes or clicking on a button, the information on what was done there is sent back to the Tapestry application. Then, depending on the logic of the application and the contents of user input, this information is passed either to the original Tapestry page, or to some other page to handle the submission and generate an appropriate response. But what is this mysterious Tapestry page that lives on the server and what does it look like .

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