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Using Thin Clients with HTML and the JavaScript API
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HTML and JavaScript are a well-suited pair of technologies for creating thin-client user interfaces. A user can open their web browser and access the application just as they would for any other web page. When the application is first accessed, a web server can send the HTML and JavaScript code to the user. The HTML may be dynamically created if a more advanced application is needed. This can be accomplished using servlets and/or JavaServer Pages. See 12 for more information on servlets and JavaServer Pages. The HTML and JavaScript combination has become a very popular method of creating web applications. In the past, JavaScript was limited in usefulness by having buggy implementations across different browsers. Recently this has changed. Web browsers from different vendors, on different platforms, have standardized how they interpret JavaScript code.This has allowed web programmers to use many advanced features in the language that were either too buggy to use before, or have only recently been added to the language. These advancements have allowed for the creation of very complex and rich interfaces that have never been seen before in a web application.These rich graphical user interfaces have greatly narrowed the gap between native applications and web applications. AJAX is a term for asynchronous JavaScript and XML.This is the primary technology behind these new advanced web applications. At its core, AJAX is just a fancy word for HTML modified by JavaScript that uses XML and its asynchronous communication between client and server. XML stands for Extensible Markup Language. In short, it is used as a general-purpose specification for designing application-specific markup languages.The asynchronous communication allows for data to be validated and updated without the entire page reloading.The term AJAX is not used on the SCJA.
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HTML used with JavaScript can create a very rich and dynamic web site. This site can be used as the front-end of an enterprise application. However, this application will not have the same feel as a native application designed for a target environment. It will be constrained to run inside a web browser and will have some limitations as to what can be done with the user interface. An advanced or very
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custom interface may be impossible or buggy to implement across different web browsers. Users must always have a network connection to the enterprise server that is hosting the web application. There is no possibility of deploying the application locally on a user s system. If the client system has a slow network connection, the responsiveness of the web application will suffer.
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HTML and JavaScript are deployed to a system that runs on a web server. HTML and JavaScript are not compiled, they are interpreted. There is no need to deploy anything directly to the clients. When a client runs the application, they will use a web browser to connect to the web server. The web server will send the clients the current version of the HTML and JavaScript.
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CERTIFICATION OBJECTIVE
Using J2ME MIDlets
Exam Objective 7.2 Describe at a high level the basic characteristics, benefits, drawbacks, and deployment issues related to creating clients using J2ME midlets. This section covers the SCJA requirements for J2ME MIDlets. A MIDlet is an application for a MIDP device. Common MIDP devices are mobile phones. These applications belong to the J2ME branch of Java. The SCJA exam will only have questions about MIDlets, but for clarity this section will discuss general aspects of J2ME along with more specific details of MIDlets. The following topics will be covered.
n J2ME and MIDlets n Configurations and profiles n J2ME disadvantages n J2ME deployment
Using J2ME MIDlets
J2ME and MIDlets
The Java 2 Platform Micro Edition (J2ME) is a Java variant intended to be used on resource-constrained devices. This edition of Java is important because it extends the already familiar Java language to mobile and embedded devices. Any developer that has experience with standard Java, J2SE, will not find it difficult to work with J2ME. Prior to J2ME, mobile devices often required developers to learn a unique set of libraries, build environments, and use specialized deployment strategies. J2ME simplified this and created a much more unified development environment. Best of all, since J2ME is just a branch of Java, developers have the ability to test their applications on a standard desktop computer. J2ME is a subset of the standard Java APIs. The exact subset is dependent on the profile and configuration of the devices. The configuration is a general description of the device. A profile is used to define the features of a device and may contain more or less of the Java class libraries based on the resources of the device. A profile may also be different based on available hardware components. For example, an embedded device with no screen would have no use for the user interface Java class libraries. Most IDEs provide an easy way to create and test MIDlets. For example, the NetBeans IDE provides the ability to automatically create a J2ME development environment and includes Sun s mobile phone emulator.The emulator allows the developer to test their application on an emulated phone on their desktop PC, instead of requiring it be deployed to a real mobile phone for testing. Figure 11-2 is an example of this emulator. Mobile phones and PDAs are the most common places to use J2ME. These devices use the Mobile Information Device Profile (MIDP). Applications created with this profile are often called MIDlets. MIDlets allow for the creation of a limited user interface on these portable devices. This profile also contains libraries for playing audio and has basic 2-D and 3-D capabilities. J2ME has become a very popular technology to create simple games for mobile phones. MIDlets can also be used for enterprise applications that connect to a backend enterprise server. These applications can make it easy to have portable access to your enterprise data, but care must be taken to keep data synchronized across all devices and the server. The MIDP is the only profile on the SCJA exam. However, it is useful to understand the following section about other configurations and profiles. This section will provide a good view of how J2ME works and utilizes different configurations and profiles in order to work with different device types.
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