ArcGIS Server Java自定义tool

tool执行的过程需要与地图交互，而后再执行命令，从下面调用语句可以看出。

    <a:tool id="countFeature" defaultImage="images/selection.gif"
        hoverImage="images/ selection.gif"
        selectedImage="images/ selectionD.gif"
        clientAction="EsriMapRectangle"
        serverAction="com.demo.MyCountFeatureTool"
        clientPostBack="true" />

    其中，clientAction可参考com.esri.adf.web.faces.event中ClientActions接口，客户端支持的操作类型包括MAP_CIRCLE，MAP_CONTINUOUS_PAN，MAP_LINE，MAP_OVAL，MAP_PAN，MAP_POINT，MAP_POLYGON，MAP_POLYLINE，MAP_RECTANGLE

   指定clientAction后，我们需要编写serverAction对应的操作类。此处实现获取选择区域选中元素个数功能。




import java.rmi.RemoteException;

import com.esri.adf.web.ags.ADFAGSException;
import com.esri.adf.web.ags.data.AGSMapResource;
import com.esri.adf.web.data.WebContext;
import com.esri.adf.web.data.geometry.WebExtent;
import com.esri.adf.web.faces.event.MapEvent;
import com.esri.adf.web.faces.event.MapToolAction;
import com.esri.arcgisws.EnvelopeN;
import com.esri.arcgisws.EsriSearchOrder;
import com.esri.arcgisws.EsriSpatialRelEnum;
import com.esri.arcgisws.MapServerPort;
import com.esri.arcgisws.SpatialFilter;

/**
 * 计算选择区内选中元素个数
 * 通过axis调用远程webservice的方式去调用服务器端的方法实现
 */
public class MyCountFeatureTool implements MapToolAction {

    WebContext context = null;
    int countedFeatures;

    private void countFeatures(WebExtent extent) {

        AGSMapResource agsMap = ((AGSMapResource) context.getResources().get("agsws1"));
        MapServerPort mapServer = agsMap.getMapServer();
        // Make a new envelope from the web extent
        EnvelopeN env = new EnvelopeN(extent.getMinX(), extent.getMinY(),
                extent.getMaxX(), extent.getMaxY(), null, null, null, null,null);

        // Setup a spatial filter for an Intersection relationship
        SpatialFilter spatialFilter = new SpatialFilter();
        spatialFilter.setSpatialRel(EsriSpatialRelEnum.esriSpatialRelIntersects);
        spatialFilter.setWhereClause("");
        spatialFilter.setSearchOrder(EsriSearchOrder.esriSearchOrderSpatial);
        spatialFilter.setSpatialRelDescription("");
        spatialFilter.setGeometryFieldName("");
        // Set the envelope as the geometry
        spatialFilter.setFilterGeometry(env);

        // MapServer::queryFeatureCount() executes on the server and can throw a
        // RemoteException
        try {
            // Count features in 4th layer which intersect with the envelope
            int layerId = 1;
            this.countedFeatures = mapServer.queryFeatureCount(mapServer
                    .getDefaultMapName(), layerId, spatialFilter);

            System.out.println("你选择了 " + countedFeatures + " 要素");
        } catch (RemoteException rme) {
            throw new ADFAGSException(
                    "Could not execute MapServer::queryFeatureCount()", rme);
        }
    }

    public void execute(MapEvent arg0) throws Exception {
        try {
            this.context = arg0.getWebContext();
            WebExtent ex = (WebExtent) arg0.getWebGeometry();
            ex = (WebExtent) ex.toMapGeometry(arg0.getWebContext().getWebMap());
            this.countFeatures(ex);
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
}

 




import java.util.List;

import com.esri.adf.web.data.WebContext;
import com.esri.adf.web.data.geometry.WebGeometry;
import com.esri.adf.web.data.query.IdentifyCriteria;
import com.esri.adf.web.data.query.QueryResult;
import com.esri.adf.web.data.query.WebQuery;
import com.esri.adf.web.faces.event.MapEvent;
import com.esri.adf.web.faces.event.MapToolAction;

/**
 * 使用WebQuery进行查询
 */
public class MyCountFeatureTool2 implements MapToolAction{

    private static final long serialVersionUID = 1L;

    public void execute(MapEvent event) {

        //得到客户端绘制图形
        WebContext ctx = event.getWebContext();
        WebGeometry screenGeo = event.getWebGeometry();
        WebGeometry mapGeo = screenGeo.toMapGeometry(ctx.getWebMap());
        
        IdentifyCriteria ic = new IdentifyCriteria(mapGeo);
        WebQuery query = (WebQuery)ctx.getAttribute("query");
        List<QueryResult> results=query.query(ic,query.getQueryLayers());
        System.out.println(results.size());
    }
}

WebQuery is a WebContextAttribute class used in a WebContext for querying attribute data and displaying related geometry objects spatially.

It is generally defined in the faces-config.xml of web applications. The following shows how it can be added as an attribute of the WebContext.

 <managed-bean>
   <managed-bean-name>mapContext</managed-bean-name>
   <managed-bean-class>com.esri.adf.web.data.WebContext</managed-bean-class>
   <managed-bean-scope>request</managed-bean-scope>
   <managed-property>
     <property-name>attributes</property-name>
     <map-entries>
      <map-entry>
        <key>query</key>
        <value>#{webappQuery}</value>
      </map-entry>
      ...
 

Below is the declaration of a WebQuery managed bean. Note the LayerDefinition managed beans being referenced below.

 <managed-bean>
   <managed-bean-name>webappQuery</managed-bean-name>
   <managed-bean-class>com.esri.adf.web.data.query.WebQuery</managed-bean-class>
   <managed-bean-scope>none</managed-bean-scope>
   <managed-property>
     <property-name>layerDefinitions</property-name>
     <list-entries>
       <value>#{arcgis_localmapgrid2_usa_2d_v_layer1}</value>
       ....
     </list-entries>
   </managed-property>
 </managed-bean>

参考：Server Java讲座--自定义Tools开发

　　　　ArcGIS Server Java讲座－空间查询和高亮显示的实现