Nevermind - I discovered that I can make the request the
java.net.HttpURLConnection class...
Thanks again for the help...
On Dec 9, 4:09 pm, Ryan <[EMAIL PROTECTED]> wrote:
> Thanks for the clear explanation and the direction. I have started
> implementing the situation in the manner you described (I think), but
> am running into another problem. The procedure below is the server
> side of a GWT RPC. The line
>
> Method method = RequestBuilder.GET;
>
> raises the following Error:
>
> ERROR: GWT.create() is only usable in client code! It cannot be
> called, for example, from server code. If you are running a unit
> test, check that your test case extends GWTTestCase and that GWT.create
> () is not called from within an initializer or constructor.
>
> Any further assistance anyone could give me would be greatly
> appreciated.
>
> Thanks, Ryan
>
> public WeatherReport getWeatherReport(Integer zipCode) throws
> Exception {
> String url = "http://www.google.com/ig/api?weather="; +
> zipCode.toString();
> try {
> Method method = RequestBuilder.GET;
> RequestBuilder builder = new RequestBuilder(method,
> URL.encode
> (url));
>
> try {
> builder.sendRequest(null, new
> RequestCallback(){
>
> public void onError(Request request,
> Throwable exception) {
> //handle error
> }
> public void
> onResponseReceived(Request request, Response
> response) {
> //handle response
> }
>
> });
> } catch (RequestException e){
> String msg = e.getMessage();
> //handle Exception
> }
>
> } catch (Throwable t){
> String msg = t.getMessage();
> //handle Throwable
> }
>
> return new WeatherReport();
>
> }
>
> On Dec 8, 11:23 pm, Adam T <[EMAIL PROTECTED]> wrote:
>
> > This technique only works for JSON that is returned as a valid
> > JavaScript function, it will not work for XML. It relies on the fact
> > that the returned JavaScript expression is evaluated by the browser
> > and thus your handle function is called. Without that, your handle
> > function can never be called with a JavaScriptObject that contains
> > data.
>
> > Normally you can get Google APIs as JSON by adding alt=json as a
> > parameter to the call, but it doesn't seem to work for the weather.
>
> > To handle only XML you will have to go through a proxy server, i.e.
> > your application makes a call to your server, your server makes a call
> > to weather service and the returned data is fed back to your
> > application by your server.
>
> > For completeness, you get "null" because that is exactly what your
> > code is telling it to send. As you are not getting a valid JSON
> > string wraped in JavaScript function then the browser never gets to
> > call your handle function with data, and you will always execute the
> > code in the timeout section. That code in the timeout section always
> > make this call:
>
> > [EMAIL PROTECTED]::handleXmlResponse
> > (Lcom/google/gwt/core/client/JavaScriptObject;Lfarmapp/client/weather/
> > WeatherReportCallback;)(null, reportCallback);
>
> > where the first parameter is "null", and hence your handle function is
> > always trying to handle "null".
>
> > Hope that goes someway to helping/explaining!
>
> > //Adam
>
> > 9 Dec, 05:55, Ryan <[EMAIL PROTECTED]> wrote:
>
> > > Hello,
>
> > > I am trying to access an XML feed via a URL request of an external
> > > server, but of course am restricted by the browser SOP. So I tried to
> > > follow the example given in the Getting Started guide for getting
> > > around SOP on a JSON request, "Get JSON via HTTP", hoping to adapt it
> > > for XML. But it's not working. The JSNI procedure getXml will return
> > > to handleXmlResponse, as it is supposed to, but the JavaScriptObject
> > > param xml is always null. It seems as though the request is timing
> > > out, as increasing the timeout delay in the JSNI procedure seems to
> > > have an effect. I have increased it all the way to 30 seconds hoping
> > > for a response, but it's just not coming.
>
> > > Obviously the procedure for XML is different enough that I need
> > > further modifications. Can anyone help me out? Thanks!
>
> > > Ryan
>
> > > **********************
> > > packagefarmapp.client.weather;
>
> > > import com.google.gwt.core.client.JavaScriptObject;
> > > import com.google.gwt.http.client.URL;
> > > import com.google.gwt.user.client.Window;
> > > import com.google.gwt.xml.client.Document;
> > > import com.google.gwt.xml.client.XMLParser;
>
> > > public class WeatherService {
>
> > > private int xmlRequestId = 0;
>
> > > public void getReport(final Integer zipCode, final
> > > WeatherReportCallback reportCallback){
> > > String url =
> > > URL.encode("http://www.google.com/ig/api?weather=";) +
> > > zipCode.toString() + "&callback=";
> > > getXml(xmlRequestId++, url, this, reportCallback);
> > > }
>
> > > public WeatherReport XmlToReport(String xml){
> > > WeatherReport result = new WeatherReport();
> > > Document doc = XMLParser.parse(xml);
> > > // convert doc to WeatherReport object
> > > return result;
> > > }
>
> > > public void handleXmlResponse(JavaScriptObject xml,
> > > WeatherReportCallback reportCallback) {
> > > if (xml == null) {
> > > Window.alert("Couldn't retrieve XML");
> > > }
>
> > > WeatherReport report = XmlToReport(xml.toString());
> > > reportCallback.onSuccess(report);
> > > }
>
> > > private native static void getXml(int requestId, String url,
> > > WeatherService handler, WeatherReportCallback reportCallback) /*-{
> > > var callback = "callback" + requestId;
> > > var script = document.createElement("script");
> > > script.setAttribute("src", url+callback);
> > > script.setAttribute("type", "text/javascript");
>
> > > window[callback] = function(xmlObj) {
> > > [EMAIL PROTECTED]::handleXmlResponse
> > > (Lcom/google/gwt/core/client/JavaScriptObject;Lfarmapp/client/weather/
> > > WeatherReportCallback;)(xmlObj, reportCallback);
> > > window[callback + "done"] = true;
> > > }
>
> > > // set 10-second timeout
> > > setTimeout(function() {
> > > if (!window[callback + "done"]) {
> > > [EMAIL PROTECTED]::handleXmlResponse
> > > (Lcom/google/gwt/core/client/JavaScriptObject;Lfarmapp/client/weather/
> > > WeatherReportCallback;)(null, reportCallback);
> > > }
> > > // cleanup
> > > document.body.removeChild(script);
> > > delete window[callback];
> > > delete window[callback + "done"];
> > > }, 10000);
>
> > > document.body.appendChild(script);
> > > }-*/;
>
> > > }
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