java qr code generator library open source Serving multiple locales in Java

Creation QR Code in Java Serving multiple locales

Serving multiple locales
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The other unpleasant possibility concerns serving content to users in different locales. The obvious challenge here is to determine the end user s preferred language and render the presentation in that language. This means having some mechanism to translate your application s user interface between natural languages, either on the fly or offline. Offline translation can be expensive and time consuming, but its result is far less likely to be unintelligible. Real-time translation has been done poorly many times, but never done well as far as we know. Also consider that everything might need to be translated, including
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text embedded in images and static text that might otherwise be embedded directly in your JSP. The second, perhaps less obvious, dimension to the multiple locale problem has to do with cultural differences. Beyond the textual content of the page, it may be appropriate and advantageous to change the entire structure of your user interface for a new locale. You might want to change color schemes, page layouts, or even the entire navigational flow of the interface. The reasons for these types of changes have to do with psychology and marketing and other ungeeklike topics that we need not address here. In this chapter, we concentrate on how to satisfy these types of requirements, assuming away the reasons. If you have tried to serve multiple languages and/or locales effectively using a pure J2EE presentation layer, you already appreciate the magnitude of the challenge. If not, we highlight its scariest features in the remainder of this chapter. What inevitably results from attempting to meet this requirement in the traditional approach is a large collection of mostly redundant, often misbehaved JSPs and servlets that are a nightmare to maintain and extend.
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An example to work through
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To really get at the heart of the matter and see how XML can help overcome the thin-client blues, let us look at some example requirements. For the sake of ubiquity and clarity, we examine a relatively simple user interface and a single point of functionality in a fictitious application. The application is a stocktrading web site, and the functional point to be explored is the rendering of a specific user s watch list of stock prices. Constraining our example to one small functional point allows us to concentrate on dynamically changing the user interface without bogging down in other details. Here are the requirements that concern us in this chapter:
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The watch list page must be viewable via PC-based web browsers and WAP-enabled cell phones. The watch list page is rendered for two locales, the United States and Great Britain. Each locale requires its own specific interface with appropriate textual messages. The price for each stock listed on the watch list should be expressed in the user s local currency, USD (United States dollars) for the U.S. and GBP (British pounds) for the U.K.
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You can see from the requirements above that our watch list user interface must consist of four pages. Figure 5.1 is an HTML page rendered for users in the United States.
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Creating a thin-client user interface
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Figure 5.1 Stock watch list HTML page United States
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Figure 5.2 is an HTML page rendered for users in Great Britain.
Stock watch list HTML page Great Britain
User interface development
Figure 5.3 is a WML page rendered for users in the United States.
Figure 5.3 Stock watch list WML page United States
Figure 5.4 is a WML page rendered for users in Great Britain.
Figure 5.4 Stock watch list WML page Great Britain
We chose the United States and Great Britain as the locales for this example to avoid the requirement of a second language on your part. In the remainder of this chapter, we create and recreate these four pages using a variety of techniques. In section 5.2, we use only the capabilities of J2EE and see where they fail us. In sections 5.3 and 5.4, we bring XML technology to the rescue and create a unified interface for this page that supports multiple device types and locales.
The pure J2EE approach
Before we discuss any new, XML-based architectural models for user interface creation, it is important to understand why we might need them. After all, we
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