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COMPOSITES AND TEMPLATES OF WEB APPLICATION DEVELOPMENT

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COMPOSITES AND TEMPLATES OF WEB APPLICATION DEVELOPMENT When a component contains more than one sub-component, this is referred to as a composite Transformation Bean. All composite Transformation Beans implement the com sas servlet beans. Composite Component Interface which has the necessary method for manipulating the sub-components within the composite web application development The following Transformation Beans are composite components: - Dual List Selector – Dual Tree Selector – Tree List Selector – Table View Composite The layout of the sub-components of a composite component is controlled by an external template file. Each composite component listed above has an associated default template file that is located in your /templates directory.

The layout of the composite can be customized to meet your needs. Maybe you just need to tweak the default template slightly to shift around the sub-components. Or maybe you need to add new components and completely overhaul the template to fit your requirements. Both of these can be done by either modifying the associated default template for that Web application or create a new template and applying that template to the component using the set Template File Name() or set Template() methods. Within a template, there are named substitution parameters which are used to position the sub components of the composite within the template. The substitution parameters begin with a % and end at the next non-Java identifier. Each composite component has an associated Keys Interface which contains the valid sub-component keys used in the template. For example, the com.sas.servlet.tbeans.dualselector.html.Dual List Selector class has its subcomponent keys defined in com.sas.servlet.tbeans.dualselector.html.DualListSelectorKeysInterface. Kepran is an web application development company providing web application development services in web application development Bangalore expertise in web application development in web application development India.

Web Application Development on Webaf

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SAS Custom Tag Library Custom tags that enable a page author to take advantage of Transformation Bean without knowing all of the required Java APIs. Debugger with support for remote and JSP debugging the integrated debugger extends familiar use of breakpoints to Web applications. You can even set breakpoints in the compiled JavaServer Pages source tab of the editor (available for supporting Web SUGI 29 Applications Development 7 servers, including the Tomcat server that is integrated in webAF).

Auto-serve of current project As you create a new Web application project, the webAF Web server will automatically serve your application, so you can just click the Execute in browser toolbar button to test it. After you make a change and rebuild the project, clicking this button again will automatically stop and restart the Web server, so your changes will be reflected in the served content. Deployment support and generation of WAR file a menu command consolidates your entire Web application into a single .war file that can be deployed to compliant web servers. During construction the web deployment descriptor (web.xml) file is validated automatically and a user-supplied or generated Manifest.mf file is included in the .war file. Ant-based customizable builds Build scripts are generated by webAF using standard Ant XML files, and are automatically modified as you add new files to your project. Build files can also be customized with user-defined targets. Start and stop Web servers convenient menu commands are provided to start and stop the current Web server. Integrated Struts and JSTL support the popular open-source, industry standard Jakarta Struts framework can serve as foundation for your Web application. Select an option in the project wizard, and webAF will automatically include the required XML files and tag libraries. The JavaServer Pages Standard Tag Library (JSTL) is also integrated, to reduce or eliminate the need for Java code snippets in JSP files. Kepran is an web application development company providing web application development services in web application development Bangalore expertise in web application development in web application development India.

BENEFITS OF WEBAF FOR WEB APPLICATION DEVELOPMENT

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BENEFITS OF WEBAF FOR WEB APPLICATION DEVELOPMENT Web applications use a diverse collection of technologies stitched together with various kinds of linkages and relationships, often in a large number of files. Conventional Web application development usually involves using a variety of command-line tools in various packages and developing batch files to try to add a degree of consistency to the process. webAF offers a refreshing alternative. It helps you manage this complexity with a single consistent, integrated tool, thus reducing or eliminating much of the drudgery of development, testing and deployment. Best of all, webAF provides tight integration with other SAS technologies, bringing all the power of SAS to life in your Web applications.

FEATURES 1. Integrated Development Environment (IDE) webAF presents you with a familiar and intuitive GUI development center, with the features of program development extended to include web development. 2. Project wizard with content templates The project wizard jump-starts your Web development by letting you choose the features that you want to include and initial content of your project. Starter files are then generated for you, including a web.xml file. An initial JSP file includes declarations of tag libraries supporting the features you selected. Servlets have boilerplate code for the standard methods. You can also "adopt" an existing Web application in the new project wizard. 3. Systematic locating of projects and directories when you start a new Web application project, webAF automatically supplies the necessary directory structure, and populates the WEB-INF\Lib directory with the JAR files needed. You can specify the base directory for your Web application to be external to the project directory, too. 4. Automatic updating of build file and web.xml As you add or remove servlets and/or Java source files from your project, webAF automatically updates the build.xml file to include the file and class path information and updates the deployment descriptor (web.xml) to include the necessary servlet declaration and mapping. Kepran is an web application development company providing web application development services in web application development Bangalore expertise in web application development in web application development India

Structs and Its Importance

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STRUTS Struts is a Web application development framework that is based on the MVC architecture and is designed for the J2EE platform. Struts have practically become the de facto standard for building Web applications. Struts consists of a set of tools and components based on standard technologies like Java Servlets, JavaServer Pages, JavaBeans, and XML that speed up the development process of building Web applications and make developers more productive. Not only is Struts a framework for developing Web applications, it also contains an extensive tag library and utility classes that work independently of the framework. Using a framework like Struts allows you, the developer, to focus in on developing just the business logic and presentation layers instead of the entire Web application. In addition to narrowing down what you have to develop, you will be starting with a robust set of tools and reusable components that will help you develop your business logic and presentation layer more quickly and efficiently.

The main classes that make up the framework are: ActionServlet and ActionMapping classes In Struts, the ActionServlet class is the controller part of the MVC architecture and is the core of the framework. This servlet is configured by defining a set of ActionMappings which are specified via the struts-config.xml file. The struts-config.xml file contains the entire logical flow of the application. Each ActionMapping defines a path that matches possible incoming URI requests and usually specifies the fully qualified class name of an Action class. SUGI 29 Applications Development 6 Action class The Action classes are the link between the Struts framework and your business logic. Most of the business logic can be represented using JavaBeans. An Action can call the properties of a JavaBean without knowing how it actually works. This encapsulates the business logic, so that the Action can focus on interpreting the outcome, error handling and ultimately dispatching control to the appropriate View component to create the response. Keoran is an web application development company providing web application development services expertise in web application development in web application development Bangalore providing web app development in web application development India

Enabling Technologies

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Enabling Technologies The enabling technologies for Web applications are varied and differentiated principally by the vendor. Enabling technologies are, in part, the mechanism by which Web pages become dynamic and respond to user input. Of the several approaches to enabling a Web application, the earliest involved the execution of a separate module by a Web server in web application dvelopment 

Instead of requesting an HTML-formatted page from the file system, the browsers would request the module, which the Web server interpreted as a request to load and to run the module. The module’s output is usually a properly formatted HTML page but could be image, audio, video, or other data. The original mechanism for processing user input in a Web system is the Common Gateway Interface (CGI), a standard way to allow Web users to execute applications on the server. Because letting users run applications on your Web server might not be the safest thing in the world, most CGI-enabled Web servers require CGI modules to reside in a special directory, typically named cgi-bin. CGI modules can be written in any language and can even be scripted. In fact, the most common language for small-scale CGI modules is Perl (practical extraction and reporting language), which is interpreted each time it is executed. Web Applications 27 Even though HTML documents are the most common output of CGI modules, they can return any number of document types. They can send to the client an image, plaintext—an ASCII document with no special formatting—audio, or even a video clip. They can also return references to other documents. In order for it to interpret the information properly, the browser must know what kind of document it is receiving. In order for the browser to know this, the CGI module must tell the server what type of document it is returning. Kepran is an web application development company providing web application development services in web application development India expertise in web application development in web application development Bangalore

Introduction to Java

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INTRODUCTION With many corporations facing increased maintenance costs of older legacy systems, they are looking for ways to streamline those systems to reduce costs while enhancing the systems functionality. This is where the Java™ 2 Enterprise Edition Platform (J2EE) 1.3 can greatly benefit a company by enabling them to integrate their legacy systems with evolving standards to create industrial strength enterprise applications. The J2EE platform is a collection of technologies that include Java Servlets, JavaServer Pages (JSP), Java Database Connectivity (JDBC), Enterprise JavaBeans (EJBs), Remote Method Invocation (RMI), and more. These technologies give you everything you need to build multi-tiered enterprise systems that are scalable, reliable, adaptable and maintainable. The J2EE platform is the perfect choice for developing enterprise applications because it offers the following benefits in web application development 

The J2EE platform is based on a set of specifications rather than an implementation which allows a company to build and deploy applications based on those specifications. This in turn prevents a company from being tied to any particular vendor/platform and allows them to switch to another vendor/platform with minimal effort. - Scalability . The J2EE platform provides all of the necessary building blocks to develop systems that scale from working prototypes to complete 24 x 7, enterprise-wide systems, which are accessible by tens, hundreds, or even thousands of simultaneous clients. - Flexible security model The J2EE platform provides a flexible and unified security model which allows application developers to set the security requirements for resources based on roles. Only users with the appropriate permissions are allowed access to specific resources. - Development productivity J2EE uses an object-oriented, component-based model for application development. This approach enhances development productivity because well-designed generic components can be reused across applications. This means faster development time, better quality and maintainability, and portability of applications. Kepran is an web application development copmany provodong web application development swervices in web application dewvelopment Bangalore expertise in web application development at web application development Bangalore.

Importance of Enhydra

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Importance of Enhydra Enhydra provides a development environment for creating Web applications, being the Open Source alternative to commercial software products that typically cost several thousand or up to tens of thousands of dollars per CPU (e.g. WebSphere by IBM, iPlanet web Application Server by Sun. A major downside of Enhydra has been its lack of support for the Java 2 Enterprise Edition. The Enhydra Architecture Web Server Application Frame work tools Application W izard XM LC Kelp Tools DODS Database Server Database Manager Data Layer D O D O Session Manager Business Layer B O BO Web Browser Enhydra Multiserver Presentation Manager Presentation Layer POPO Web Server with Enhydra Director Multiserver Admin JDBC JD BC • A Web server. The Web server can either be the Enhydra Multiserver, which is an HTTP 1.1 Web server with servlet engine supporting the servlet API version 2.2, or any other Web server with servlet engine. Enhydra applications work with any standards-compliant servlet runner. • The Application Framework. Currently, Enhydra offers two distinct application models. The developer may either choose the Enhydra-specific “Enhydra super-servlet application framework”, or the “servlet application framework” that follows J2EE standards. The differences are described in further detail below. 19 • Tools. Enhydra offers a set of tools that help build a Web application. Enhydra separates the application logic into three layers: The presentation layer, the business layer, and the data layer. Following this concept ensures that the designers can independently work on the presentation while software engineers work on the application logic. Providing three distinct layers also increases the maintainability of the code. Kepran is an web application development company providing web application development services in web application development Bangalore expertise in web application development at web application develpp[ment India

 

The Apache Web Server

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The Apache Web Server Apache is by far the most popular Web server today, with a market share of about 60% according to the Netcraft Web server survey . Apache is maintained by the Apache Software Foundation Brian Behlendorf and Cliff Skolnick initiated the Apache project in 1995 out of the need for rapid development of new Web server features.

The first version of Apache was based on the NCSA HTTPd Web server, and modified through patches (therefore the name: Apache = “a patchy” server). The original code base was eventually replaced in the next revision. An important year for Apache was 1998 when an agreement with IBM for the continued development of Apache was reached in web application developement IBM now includes the Apache code in its WebSphere server product. Today, many voluntary contributions from companies and individuals guarantee for the ongoing success of the Apache Web server. The following is a list of Apache features for the current version 2.0: • Serves static and dynamic CGI Web pages. Can interface with many dynamic content generation technologies such as Perl, Java Servlets, or PHP . • Highly configurable. Apache is composed of many modules that can be optionally added or removed, as well as configured. • Extensive security features. Several forms of authentication, including SSL encryption are available. • Portable (implementations are available for many platforms, including Windows, Unix, Linux, and OS/2). Kepran INFOSOFT is a leading web development company in Bangalore. We provide best quality web development in Bangalore and are a team of specialized web developers that is continuously at its best to serve to your web development needs. we are skilled in website designing and web development, website maintenance ,and search engine optimization.

Client state Management

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One common challenge of Web applications is managing client state on the server. Owing to the connectionless nature of client and server communications, a server doesn’t have an easy way to keep track of each client request and to associate it with the previous request, since each and every Web page request establishes and breaks a completely new set of connections. Managing state is important for many applications; a single use case scenario often involves navigating through a number of Web pages. Without a state management mechanism, you would have to continually supply all previous information entered for each new Web page. Even for the most simple web applications, this can get tedious. Imagine having to reenter the contents of your shopping cart every time you visit it or to enter in your user name and password for each and every screen you visit while checking your Web-based e-mail. To address this common problem, the W3C has proposed an HTTP state management mechanism.6 This mechanism, more commonly known as “cookies,” has received quite a bit of attention from privacy advocates in the past few years and will most likely continue to as more and interesting uses of this mechanism are found. This book isn’t about privacy concerns but rather is focused on the technology around Web applications, so I’ll focus on describing the technology and leave the philosophy to you. Kepran is an web application development company providing web application development services

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Web Application Development using Google Web Toolkit

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Traditional web applications focus on client server architecture where all the processing is done on the server side and a thin client which is only used to display the static contents. Synchronous mode is used to do request and response to the server and from the server. Server creates new page for every request and sends to the client browser and keeps the state information every time the request is made. This approach has significant drawbacks and limitations, especially due to the richness of the application interfaces and the overall sophistication of the solutions that could be built and delivered [3]. These Traditional old-fashioned web applications are being replaced by the Rich Internet Applications (RIAs) which use a Rich Client deployment model that provide richer and more interactive user interfaces. AJAX (Asynchronous JavaScript and XML) uses Rich Internet Application that follow Asynchronous mode for request and response which sends a data to the server and retrieve from a server without interfering with the display and behavior of the existing page asynchronously (in the background) Google Web Toolkit (GWT) is a technology for creating rich AJAX applications using Java as the programming language which on compilation produces JavaScript code suitable for each browser.

GWT is open source and used by hundreds of developers to build large scale and high performance web application by keeping them as easy-to-maintain. Try to show an attempt to provide measure for developing an application using the features of Google Web Toolkit. We have shown the procedure of integrating the different elements of GWT. II. Conceptualization 2.1 Google Web Toolkit GWT is an open source framework that allows a developer to develop Ajax-based applications in the Java language and provides tools to convert the Java code into JavaScript and HTML. For the compilation process a set of JavaScript libraries that emulate requires the classes to be included in the Java virtual machine (JVM) known as JRE (Java Runtime Environment emulation library [1]. This frees developer, from the burden of rewriting JavaScript Code to suit the standards of various web browsers. Kepran is an web application developoment company providing web application development services in web application development Bangalore expertise in web application development at web application development India.