Using RESTful Web Services in Java

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Using RESTful Web Services
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will be processed However, the pull API works well only if you can rely on the ordering of elements in the document that you are parsing In this case, the code assumes that the <name> element appears before the <address> element, but suppose that the ordering of these elements were to be reversed:
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<id> <address type="home">Here</address> <address type="business">There</address> <name>John Doe</name> </id>
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The seek() call on line 21 of Listing 27-3 will still find the <name> element, but the call on line 25 will not locate the <address> element because it has already been read and discardedThe second seek() call will actually read through the remainder of the document and will return when it reaches the end, leaving and END_DOCUMENT event in the parser s event variable
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A Twitter Web Service Client
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You have seen how to make HTTP requests and how to parse XML, so now it is time to put the two together and show you how to get some information from a web service and convert it into a form in which it can be displayed in a JavaFX applicationThe web service that we use provides a timeline that contains the 20 most recent public posts of a user of the Twitter social networking site For this example, we will retrieve the timeline for the userInformIT I chose to use this timeline for this example because, unlike some web services, it does not require you to register and get a key before you can use it and does not require authentication when you make a request In addition, it can provide results in several different formats, including XML, which is the format we will use here To get the current content of this timeline, you just make an HTTP GET request to the URL http://apitwittercom/1/statuses/user_timeline/informitxml In keeping with the spirit of RESTful web services, the GET method indicates that this is a read operation and the URL indicates the information that we want to readThe xml suffix of the URL causes the results to be returned in XML formatYou can find the official documentation for this service at http://apiwikitwittercom/Twitter-REST-API-Method%3A-statuses_ timeline Having read the timeline, we will convert it into a sequence of objects that contains the parts of each message that we want to display Here s the definition of the JavaFX class that represents each message, which you ll find in the file javafxdata/TwitterEntryfx:
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public class TwitterEntry { public-init var user:String; public-init var imageURL:String; public-init var time:String; public-init var content:String; }
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Each message will be displayed by a custom node called InformationNode, which we won t discuss in any detail in this chapter If you are interested in how it works, you ll find the source code in the file javafxdata/InformationNodefx When this application is started, it shows only a title; once the web service call has completed, it parses the returned XML to create a sequence of TwitterEntry objects The user interface converts each TwitterEntry object into an InformationNode and arranges them all in a VBox, which is itself wrapped in a ClipView and linked to a ScrollBar Here s the code that actually displays the messages, from the file javafxdata/TwitterInformtITTimelinefx, which you should run if you want to try out this application:
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clipView = ClipView { node: VBox { nodeHPos: HPosCENTER content: bind for (entry in entries) { InformationNode { name: entryuser imageURL: entryimageURL message: "{entrytime}\n{entrycontent}" } } }
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Invoking the Twitter Web Service The code that gets the content of the timeline can be found in the file javafxdata/TwitterClientfxThe function that is used to call the web service is shown in Listing 27-4
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Listing 27-4
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