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。
MyCountFeatureTool
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