学习GeoTools的Data模块的相关内容（下）– (学习GIS【2】)

package com.geoguide.snail.geotools;

import java.io.*;

import java.net.*;

import java.util.*;

import org.geotools.data.*;

import org.geotools.data.shapefile.indexed.*;

import org.geotools.feature.*;

import org.geotools.referencing.*;

import org.opengis.feature.simple.SimpleFeatureType;

import org.opengis.feature.type.FeatureType;

import org.opengis.referencing.*;

import org.opengis.referencing.crs.*;

public class NewShapefile {

  public static void main(String[] args) {

    FileDataStoreFactorySpi factory = new IndexedShapefileDataStoreFactory();

    File file = new File(“C://testType.shp”);

    Map map = null;

    try {

      map = Collections.singletonMap(“url”, file.toURI().toURL());

    }

    catch (MalformedURLException ex2) {

      ex2.printStackTrace();

    }

    DataStore myData = null;

    try {

      myData = factory.createNewDataStore(map);

      FeatureType featureType = null;

      try {

        featureType = DataUtilities.createType(“my”, “geom:Point,name:String,age:Integer,des:String”);

      }

      catch (SchemaException ex) {

        ex.printStackTrace();

      }

      CoordinateReferenceSystem crs = null;

      try {

        crs = CRS.decode(“EPSG:4326”);

      }

      catch (NoSuchAuthorityCodeException ex3) {

        ex3.printStackTrace();

      }

      catch (FactoryException ex3) {

        ex3.printStackTrace();

      }

      if(myData instanceof IndexedShapefileDataStore){

        ((IndexedShapefileDataStore)myData).forceSchemaCRS(crs);

      }

      myData.createSchema( (SimpleFeatureType) featureType);

    }

    catch (IOException ex1) {

      ex1.printStackTrace();

    }

  }

}

/*

 *    GeoTools – The Open Source Java GIS Tookit

 *    http://geotools.org

 *

 *    (C) 2006-2008, Open Source Geospatial Foundation (OSGeo)

 *

 *    This file is hereby placed into the Public Domain. This means anyone is

 *    free to do whatever they wish with this file. Use it well and enjoy!

 */

package com.geoguide.snail.geotools.demo;

import java.io.*;

import java.util.*;

import org.geotools.data.*;

import org.geotools.demo.swing.*;

import org.geotools.factory.*;

import org.geotools.feature.*;

import org.geotools.feature.collection.*;

import org.geotools.gui.swing.*;

import org.opengis.feature.Feature;

import org.opengis.feature.simple.SimpleFeature;

import org.opengis.feature.simple.SimpleFeatureType;

import com.vividsolutions.jts.geom.*;

/**

 * How to Read a Shapefile.

 * <p>

 * Please visit the GeoTools User Guide: <a

 * href=”http://docs.codehaus.org/display/GEOTDOC/04+How+to+Read+a+Shapefile”>

 *

 * @author Jody Garnett (Refractions Research)

 *

 */

public class ShapefileRead {

  public static void main(String[] args) throws Exception {

    System.out.println(“Welcome to GeoTools:” + GeoTools.getVersion());

    File file;

    if (args.length == 0) {

      file = ShapeFileDialog.showOpenShapefile(null);

    }

    else {

      file = new File(args[0]);

    }

    if (file == null || !file.exists()) {

      System.exit(1);

    }

    Map<String, Object> connect = new HashMap<String, Object> ();

    connect.put(“url”, file.toURI().toURL());

    DataStore dataStore = DataStoreFinder.getDataStore(connect);

    String[] typeNames = dataStore.getTypeNames();

    String typeName = typeNames[0];

    System.out.println(“Reading content ” + typeName);

    FeatureSource<SimpleFeatureType, SimpleFeature> featureSource = dataStore.getFeatureSource(typeName);

    FeatureCollection<SimpleFeatureType, SimpleFeature> collection = featureSource.getFeatures();

    class DistanceVisitor

        extends AbstractFeatureVisitor {

      int length = 0;

      double area = 0;

      public void visit(Feature feature) {

        Geometry geometry = (Geometry) feature.getDefaultGeometryProperty().getValue();

        length += geometry.getLength();

        area += geometry.getArea();

      }

    };

    DistanceVisitor distance = new DistanceVisitor();

    collection.accepts(distance, new ProgressWindow(null));

    System.out.println(“Total length ” + distance.length);

    System.out.println(“Total area ” + distance.area);

  }

}