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Since you re likely using a web framework already there s no need to start writing servlets again to simply service your Ajax requests. Remember, an Ajax request is just like any other HTTP request. The only difference is that the browser sends the Ajax request asynchronously so that the browser remains responsive to user input. So, why not use your favorite web framework to service the requests instead of writing servlets By using a web framework, you ll also be able to leverage the features and services offered by that framework. We ll spend the next few chapters reviewing the most popular Java web frameworks and how they integrate with Ajax. We ll also show how each framework s special features can be used to make the most of Ajax.

This code gives the same result as the preceding example. You can get a hash s keys or values returned as an array with Hash#keys and Hash#values, respectively:

Note The component screen shots in this chapter are based on the blueSky and deepMarine skins. I cover

airportCodes.keys(); //-> ["AUS", "HOU", "IAH", "DAL", "DFW"] airportCodes.values(); //-> ["Austin-Bergstrom Int'l", "Houston/Hobby", "Houston/Intercontinental", //-> "Dallas/Love Field", "Dallas/Fort Worth"]

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truts is the granddaddy of all the Java web frameworks. Craig R. McClanahan launched Struts in May 2000, with the 1.0 release following in July 2001. Since that time Struts has arguably become the most popular Java web framework and due to its relatively old age is sometimes considered to be legacy. Struts pioneered the Model 2 model-view-controller (MVC) pattern that has become the standard among Java web frameworks. The Model 2 MVC pattern uses a servlet to control application flow, making it the controller. The controller typically delegates to a handler object that acts as the adapter between the request and the model. The model, of course, represents the application s business objects or domain layer. After processing the request the controller forwards the request to the appropriate view, which is usually implemented using JSPs. In addition to providing a Model 2 MVC implementation for Java web applications, Struts provides a number of services that can help ease the burden of developing modern, interactive web applications. Foremost among these services is the validation framework. Before the availability of the Struts validator, we had to write all of our own validation routines, such as verifying that the user filled out all of the information on the page or that a particular input field was in the correct format. The Struts validator will automatically perform validations on input fields based on definitions stored in an XML file, so instead of writing the tedious code to perform validations, you can simply specify validations in an XML file and the Struts validator will take care of the rest.

Finally, you can convert a hash back to a plain Object with Hash#toObject:

airportCodes.toObject(); //-> { //-> AUS: "Austin-Bergstrom Int'l", //-> HOU: "Houston/Hobby", //-> IAH: "Houston/Intercontinental", //-> DAL: "Dallas/Love Field", //-> DFW: "Dallas/Fort Worth" //-> }

The following is not meant to be a complete Struts tutorial but rather a refresher on Struts design and implementation. You ve likely worked with Struts at some point in your career as a Java web application developer, but even if you haven t, you ll likely be familiar with its concepts as other Java web application frameworks (even homebuilt ones) often mirror Struts implementation. The core of Struts is a servlet that acts as the controller within the MVC implementation. The Struts controller servlet is responsible for acting as a bridge between the application model and the web view. The controller passes requests to a request handler which is an instance of an Action class. The typical web application will use many different Action

<rich:pickList> allows you to select items and move them from one list to another. This component is virtually identical to the standard <h:selectManyMenu> and <h:selectManyListbox> components, both of which also allow you to select one or more values and save them into a list. If you have used the Eclipse WTP plug-in to deploy projects, the Add and Remove Projects Wizard has a similar view where you can deploy/undeploy projects:

names we used in the original string. Note also that we need only create the template once but we can use it over and over to generate strings that conform to the same pattern. Since an array is just a special kind of object with numeric property names, you can define a template that uses numbered replacements:

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