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11 Moving Around Files
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For generality, we can let the servlet answer to POST methods in the same way than to GETs
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@Override protected void doPost( final HttpServletRequest request, final HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } }
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Now, running the form and clicking the button or link will call the servlet, produce a
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somefiletxt text file, and give you the option to open or download it See Figure 113
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Figure 113 Clicking on either the button or the link does a call to the
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servlet that produces a simple text file as output
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It s most important to note that in this example, we have been mostly using timetried web programming techniques and not much GWT-original code (If, for example, you wanted to display the contents in a separate window, you would just add target= "_blank" to the link s destination; pure classic HTML!) Also, you need not invoke a servlet; it would have been equally simple (just a matter of changing destinations) to interact with PHP or Python scripts; the client-side code doesn t care, and the serverside programming need not know that it is talking to a GWT client
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In this chapter we studied both how to upload and download files from a server These processes required using forms and Ajax, so we got to complement the server-communication techniques seen in previous chapters We also interacted with common servlets, proving GWT can coexist in a more classic Java-oriented server-side architecture
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Internationalization and Localization
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Developing applicationsspecific techniques,inbut GWTcountries, with differentinternathat can be used different languages, requires applying simplifies dealing with
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tionalization (i18n) and localization (l10n) matters In this chapter we ll examine the relevant tools, and also how to apply them to UiBinder designed forms If you are developing an application that will potentially be used worldwide, instead of being restricted to an Intranet, you will have to take into account multiculture and multilanguage aspects, so your software is still usable Since having several separate versions for each required language (or, worse, for each locale; remember American English isn t the same as British English, for example) can soon become quite unwieldy, you ll want to use methods that allow developing and maintaining just one code base GWT provides i18n support with its Constants and ConstantsWithLookup interfaces allowing you to work with string literals in different languages, and with the Messages interface, which adds singular/plural considerations, as well as to work with UiBinder Finally, in terms of l10n, GWT lets you deal with different currency or date formats, allowing you to more completely adapt your application to specific groups of users, and that will be the last theme in this chapter1
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Let s start by considering how to provide appropriate texts for users in different countries We ll first give a quick overview to Java s standard resource bundles, and then move
1 By the way, if you don t know where i18n and l10n come from, i18n refers to the fact that there are 18 letters between the initial i and the final n in internationalization, and likewise for l10n and localization
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12 Internationalization and Localization
to the ConstantsWithLookup and Messages GWT interfaces, which will let us use those bundles in a quite efficient way2 All i18n methods require the same libraries, so no matter which one you decide to use, you ll have to add the line <inherits name="comgooglegwti18nI18N"/> to your gwtxml configuration file
Resource Bundles
In standard Java programming, internationalization is usually done by means of resource bundles: properties files with locale-specific data Although this data might be anything (numbers, dates, whatever) most usually we ll just deal with strings Each string is identified by a key, which must remain constant across different resource bundles Basically, in your code you will (mostly indirectly, sometimes directly) refer to this key so your program will be locale-independent, inasmuch as what string will be shown shall depend on which locale resource bundle you use GWT supports generic resource bundles (strings that will be shown if no other more specific locale is chosen), language resource bundles (for example, English or Spanish versions of your strings), and even country-specific resource bundles (such as British English, or Mexican Spanish) You should have a generic bundle file, plus one or more language bundles, plus possibly some country specific bundles All keys should appear in the generic bundle file If a certain key appears in several bundles, country strings have priority over language strings, and the latter have priority over the generic ones For example, suppose we are given these bundles (whose names shall be explained presently)
Transportproperties flight=airplane vehicle=car underground=subway sea=ship Transport_en_GBproperties flight=aeroplane underground=tube Transport_esproperties flight=avi n vehicle=autom vil underground=subterr neo sea=barco
In this case, a British user who wanted to use the underground would get a message about the tube; Spanish users would get references to the subterr neo; everybody else (including other non-British English speakers) would get the subway standard reference (GWT considers English as the standard language) Note that you don t have to repeat keys in all files; all British users would get car for vehicle, for example, because they don t have a specific string value for that key You should always provide a basic, standard reference (though you don t need to use a resource bundle for this, because you can do with annotations; see the following) plus
2 If you also have to support RTL (right-to-left) languages such as Arabic or Hebrew, using the techniques in this chapter won t be enough, for you ll also have to change the visual theme; see http://codegooglecom/webtoolkit/doc/latest/DevGuideUiCsshtml#themes for more on this