hi, all
i am new to geotools. i am trying the shapefile reading programe on the
website. but it got problem when running it.
problem is: java.lang.NullPointerException!!!
the code is shown below. i think problem is in this line: "DataStore
dataStore = DataStoreFinder.getDataStore( connect );". please help me about
it. thanks a lot~~~~
//package org.geotools.demo.example;
import java.io.File;
import java.util.Map;
import java.util.HashMap;
import org.geotools.data.DataStore;
import org.geotools.data.DataStoreFinder;
import org.geotools.data.FeatureSource;
import org.geotools.feature.FeatureCollection;
import org.geotools.feature.FeatureIterator;
import org.geotools.feature.Feature;
import com.vividsolutions.jts.geom.Geometry;
import org.geotools.data.shapefile.*;
import org.geotools.data.shapefile.shp.*;
import org.geotools.data.shapefile.dbf.*;
//import org.geotools.factory.GeoTools;
public class readDATA
{
public static void main( String[] args )
{
System.out.println( "Hello GeoTools " );
try {
//if( args.length != 1 ) System.exit(1);
File file = new File( "bc_hospitals.shp" );
if( !file.exists() ) System.exit(1);
Map connect = new HashMap();
connect.put( "url", file.toURL() );
System.out.println(file.toURL().toString());
DataStore dataStore = DataStoreFinder.getDataStore( connect );
String[] typeNames = dataStore.getTypeNames();
String typeName = typeNames[0];
System.out.println( "Reading content "+ typeName );
FeatureSource featureSource = dataStore.getFeatureSource(
typeName );
FeatureCollection collection = featureSource.getFeatures();
FeatureIterator iterator = collection.features();
int length = 0;
try {
while( iterator.hasNext() ){
Feature feature = iterator.next();
Geometry geometry = feature.getDefaultGeometry();
length += geometry.getLength();
}
}
finally {
iterator.close();
}
System.out.println( "Total length "+length );
} catch (Exception e) {
e.printStackTrace();
}
}
}
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