Using RESTful Web Services in Java

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This JSON object contains a single weather report for KDCA, with fields that describe the cloud condition, temperature, wind speed and direction, and so on In the rest of this section, you ll see how to invoke the web service from JavaFX code and parse the result into a form that can be displayed to the userThe application that we re going to create is shown in Figure 27-4
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Figure 27-4
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Displaying airport weather reports
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You ll find the code that creates the simple user interface for this application in the file not going to discuss this code in any detail Instead, we ll concentrate on the details of the interaction with the web service itself, which you ll find in the file javafxdata/JSONWeatherClientfx
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javafxdata/JSONWeatherfxWe re
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Invoking the JSON Weather Service The code to invoke the weather web service is shown in Listing 27-7
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Listing 27-7
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Getting Information from the JSON Weather Service
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public function getWeather(place:String, onDone:function(String)){ var os = new ByteArrayOutputStream(); var req = HttpRequest { location: "http://wsgeonamesorg/weatherIcaoJSON ICAO={place}" sink: os onDone: function() { onDone(processJSONResponse(place, os)); } } reqstart(); }
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The parameters to the getWeather() function are the ICAO code of an airport and a function to be called when the web service response has been received and parsed Unlike the Twitter client example that you saw earlier in this chapter, we don t convert the
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response into a JavaFX object with variables for the various parts of the response that the caller might be interested in Instead, for the sake of simplicity and to illustrate a different response, we simply create a summary of the weather that will be displayed as is in the user interface To initiate the request for the weather, we create an HttpRequest object and initialize its location variable with a URL that the web service interprets as a request for a weather report Notice that the URL, constructed on line 5, includes a parameter whose value is the ICAO code of the airport Here s the URL that would used to get the weather for Washington Reagan airport:
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http://wsgeonamesorg/weatherIcaoJSON ICAO=KDCA
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The result is written to a ByteArrayOutputStream and, on completion, the parsing code in the function processJSONResponse() will be calledApart from the URL, this code is almost identical to that used to get the XML-based Twitter user timeline, shown in Listing 27-4The major difference between these two examples is, of course, in the parsing code Parsing the Weather Service Response To parse the response from the weather service, we create a PullParser, set its documentType variable to PullParserJSON, install an event handler, and call the parse() function Listing 27-8 shows the details
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Listing 27-8
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Parsing the Response from the JSON Weather Service
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function processJSONResponse(place:String, os:ByteArrayOutputStream):String { var is = new ByteArrayInputStream(ostoByteArray()); var country = "(Unreported)"; var clouds = "(Unreported)"; var windDir = "(Unreported)"; var windSpeed = "(Unreported)"; var temp = "(Unreported)"; var stationName = "(Unreported)"; var time = "(Unreported)"; var parser = PullParser { input: is documentType: PullParserJSON onEvent: function(evt) { var type = evttype; var name = evtname; if (type == PullParserTEXT) { if (name == "countryCode") { country = evttext; } else if (name == "clouds") { clouds = evttext; } else if (name == "windSpeed") { windSpeed = evttext;
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} else if (name == "temperature") { temp = evttext; } else if (name == "stationName") { stationName = evttext; } else if (name == "datetime") { time = evttext; } } else if (type == PullParserINTEGER) { if (name == "windDirection") { windDir = "{evtintegerValue}"; } } } } parserparse(); isclose(); "Weather for airport {place} ({country})\n" "Time: {time}\n" "Station name is {stationName}\n" "Wind {windSpeed} knots from {windDir}\n" "Temperature {temp}C\n" "Cloud condition: {clouds}\n" }
The variables on lines 4 to 10 will hold the values that are extracted from the response Because values are sometimes omitted, the variables are all initialized with the string "(Unreported)" so that it is clear to the user that information was not provided The event handling function on lines 15 to 36 handles both TEXT and INTEGER events This is necessary because some of the weather details are returned in string form and others in integer form10 The code simply checks the name associated with each event and stores the value in the appropriate variable Finally, when the document has been completely parsed, the information that has been received is used to create the message that will appear in the user interface