flex 调用gp服务

同步异步说明：

gp服务分为同步和异步两种模式，两者的区别是：
同步：适合于快速的处理，数据量较小，本质区别在于同步模式，服务器处理之后，处理结果并不在服务器端保存，而是将结果发送至客户端，由客户端去显示。如果客户端也没有          保存结果，那么处理结果就丢失了。
异步：适合长时间的处理，数据量较大，本质区别在于异步模式，服务器处理之后，处理结果保存在服务器端，可以在arcgisjobs文件中找到。
所以Web客户端调用gp服务，要依据是哪种模式。以flex api为例，如果是同步模式，那么只能使用gp.execute(para);，得到的结果只能是executeResult；如果是异步，则只能使用gp.submitJob(para);，得到的结果只能使用gp.getResultData(evt.jobInfo.jobId,"Buffer_shp")去服务器端取结果，因为异步模式服务器端是保留了你的处理结果的。

同步调用方法

标签：

<esri:Geoprocessor id="gp" executeComplete="gp_executeCompleteHandler(event)"
                           fault="gp_faultHandler(event)"
                           outSpatialReference="{map.spatialReference}"
                           processSpatialReference="{map.spatialReference}"
                           useAMF="false"/>

调用：

               var geoArr:Array=[];
                for each(var geo:Geometry in geoCollArray)
                {
                    geoArr.push({geometry:geo});
                }

                var fs:FeatureSet=new FeatureSet();
                fs.features=geoArr;
                var params:Object={"INPUT_FEATURESET":fs,"GHLAYER_PATH":"'"+dataList.selectedItem.path+"'"};
                gp.url=configXML.gpurl.toString();
                gp.execute(params);

结果

protected function gp_faultHandler(event:FaultEvent):void
            {
                Alert.show("空间分析异常,请联系管理员", "图形分析");
            }
protected function gp_executeCompleteHandler(event:GeoprocessorEvent):void
            {
                var fs:FeatureSet=event.executeResult.results[0].value as FeatureSet;
                controlEnabled=true;
                showMessage("", false, false);

                ViewerContainer.getInstance().resultContainer.Container.removeAllElements();
                resultComp=new GeometryAnalysisResultComp();
                var areas:Array=GeometryUtil.geodesicAreas(geoCollArray,Units.SQUARE_METERS);
                var area:Number=Number(areas[0]);
                resultComp.initData={fs:fs,fields:fs.fields,groupfield:dataList.selectedItem.showField.toString(),geo:geoCollArray[0],zarea:area,url:configXML.saveAnalysis};
                ViewerContainer.getInstance().resultContainer.Container.addElement(resultComp);
                ViewerContainer.getInstance().resultContainer.showBottomNavi();
            }

异步调用方法：

标签

<esri:Geoprocessor id="gp"
                           fault="gp_faultHandler(event)"
                           getResultDataComplete="gp_getResultDataCompleteHandler(event)"
                           jobComplete="gp_jobCompleteHandler(event)"
                           outSpatialReference="{myMap.spatialReference}"
                           proxyURL="https://developers.arcgis.com/sproxy/"
                           url="https://logistics.arcgis.com/arcgis/rest/services/World/ServiceAreas/GPServer/GenerateServiceAreas"/>

调用

  var featureSet:FeatureSet = new FeatureSet();
                featureSet.features = [ graphic ];
                var params:Object =
                    {
                        "Facilities": featureSet,
                        "Break_Values": "2",
                        "Break_Units": "Minutes"
                    };
                gp.submitJob(params);

结果

 protected function gp_faultHandler(event:FaultEvent):void
            {
                Alert.show("This service request an ArcGIS Organizational subscription\nYou can also try the example on the ArcGIS API for Flex Resource Center"
                           + event.fault.faultString, "Drive Time");
                progressMessage.clearMessage();
            }

            protected function gp_jobCompleteHandler(event:GeoprocessorEvent):void
            {
                if (event.jobInfo.jobStatus == JobInfo.STATUS_SUCCEEDED)
                {
                    var jobID:String = event.jobInfo.jobId;
                    progressMessage.setMessage("Retrieving drive time");
                    gp.getResultData(gp.submitJobLastResult.jobId, "Service_Areas");
                }
                else
                {
                    Alert.show(event.jobInfo.jobStatus, "Analysis Status");
                }
            }

            protected function gp_getResultDataCompleteHandler(event:GeoprocessorEvent):void
            {
                /* The parameterValue property is set when the type is getResultDataComplete,
                 * getInputComplete or getResultImageComplete.
                 */
                if (event.parameterValue)
                {
                    progressMessage.showMessage("Calculating population within drive time", true);
                    var serviceAreas:FeatureSet = event.parameterValue.value as FeatureSet;
                    var feature:Graphic = serviceAreas.features[0];
                    var symbol:SimpleFillSymbol = new SimpleFillSymbol(SimpleFillSymbol.STYLE_SOLID, 0xCA0013, 0.1);
                    symbol.outline = new SimpleLineSymbol(SimpleLineSymbol.STYLE_SOLID, 0xB3B3B3, 1.0, 2);
                    feature.symbol = symbol;
                    myMap.defaultGraphicsLayer.add(feature);
                    query.geometry = feature.geometry;
                    queryTask.execute(query);
                    //Note: the zoomTo method was added at version 3.1
                    myMap.zoomTo(feature.geometry.extent);
                }
                else
                {
                    Alert.show("Service did not return any results", "Drive Time");
                    gpPending = false;
                }
            }

转换：

fs->json字符串

saveWindow.fs=JSONUtil.encode(FeatureSet(initData.fs).toJSON())

json字符串- >fs

var fs:FeatureSet=FeatureSet.fromJSON(JSONUtil.decode(jsonObjTem[0].content));