GeoTools应用：读取Shape文件中的空间坐标数据(2)
目录
一、环境准备
装配GeoTools有两种方式，一种是配置maven工程的pom文件(配置方式参考官网)，另一种是下载geotools的jar包到本地导入依赖。我采用的是下载jar的方式，下载路径：https://sourceforge.net/projects/geotools/files/
二、实现功能
本章要实现的功能是从shape文件中读取空间坐标数据，包括点、多线、多多边形数据的读取。基本上涵盖了实际项目中用到的所有地图数据。
三、样例代码
1、构建基础GIS对象模型
直接使用GeoTools的geometry模型，不好用。实际应用中都会在外面包一层，具体封装什么根据业务需要来。这里给一个简单的样例，后面的所有样例代码都会沿用这些模型。
1)定义对象类型枚举值
package com.elon.constant;
/**
* GIS图层对象枚举定义
* @author elon
* @version 2018年6月26日
*/
public enum EnumGISObjectType {
POINT(1),
LINE(2),
POLYGON(4);
private int type;
private EnumGISObjectType(int type) {
this.type = type;
}
public int getType() {
return type;
}
}
2)定义GISObjectBase.java基类
package com.elon.model.gismodel;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.opengis.feature.simple.SimpleFeature;
import com.elon.constant.EnumGISObjectType;
import com.elon.model.ShapeFieldInfo;
/**
* GIS对象基类定义。
*
* @author elon
* @version 2018年6月26日
*/
public class GISObjectBase implements Serializable {
private static final long serialVersionUID = -6147262367078689317L;
/**
* 对象类型枚举
*/
private final EnumGISObjectType type;
private SimpleFeature simpleFeature = null;
/**
* 属性列信息
*/
private List<ShapeFieldInfo> attrFieldList = new ArrayList<>();
/**
* 属性值信息<属性名称, 属性值>
*/
private Map<String, Object> attributeMap = new HashMap<>();
protected GISObjectBase(EnumGISObjectType type, SimpleFeature simpleFeature,
List<ShapeFieldInfo> attrFieldList){
this.type = type;
this.simpleFeature = simpleFeature;
this.attrFieldList = attrFieldList;
}
public EnumGISObjectType getType() {
return type;
}
public SimpleFeature getSimpleFeature() {
return simpleFeature;
}
public Map<String, Object> getAttributeMap() {
return attributeMap;
}
public void setAttributeMap(Map<String, Object> attributeMap) {
this.attributeMap = attributeMap;
}
public void addAttribute(String attrName, Object value) {
attributeMap.put(attrName, value);
}
public void setSimpleFeature(SimpleFeature simpleFeature) {
this.simpleFeature = simpleFeature;
}
public List<ShapeFieldInfo> getAttrFieldList() {
return attrFieldList;
}
public void setAttrFieldList(List<ShapeFieldInfo> attrFieldList) {
this.attrFieldList = attrFieldList;
}
}
3)定义点模型GISPoint.java*
package com.elon.model.gismodel;
import org.opengis.feature.simple.SimpleFeature;
import com.elon.constant.EnumGISObjectType;
import com.vividsolutions.jts.geom.Point;
/**
* 点对象模型
* @author elon
* @version 2018年6月26日
*/
public class GISPoint extends GISObjectBase {
private static final long serialVersionUID = 851468237977190995L;
/**
* 点geometry对象
*/
private Point point = null;
public GISPoint(Point point, SimpleFeature simpleFeature) {
super(EnumGISObjectType.POINT, simpleFeature);
this.point = point;
}
public Point getPoint() {
return point;
}
public void setPoint(Point point) {
this.point = point;
}
}
4)定义线模型GisLine.java
package com.elon.model.gismodel;
import org.opengis.feature.simple.SimpleFeature;
import com.elon.constant.EnumGISObjectType;
import com.vividsolutions.jts.geom.MultiLineString;
/**
* 线对象模型。
*
* @author elon
* @version 2018年6月26日
*/
public class GisLine extends GISObjectBase {
private static final long serialVersionUID = 495559767188836052L;
/**
* 多线geometry对象
*/
private MultiLineString line = null;
public GisLine(MultiLineString line, SimpleFeature simpleFeature) {
super(EnumGISObjectType.LINE, simpleFeature);
this.line = line;
}
public MultiLineString getLine() {
return line;
}
public void setLine(MultiLineString line) {
this.line = line;
}
}5)定义多边形模型
package com.elon.model.gismodel;
import org.opengis.feature.simple.SimpleFeature;
import com.elon.constant.EnumGISObjectType;
import com.vividsolutions.jts.geom.MultiPolygon;
/**
* 多边形模型。
*
* @author elon
* @version 2018年6月26日
*/
public class GisMultiPolygon extends GISObjectBase {
private static final long serialVersionUID = -5705724544971923893L;
/**
* 多边形的geomtry模型。
*/
private MultiPolygon polygon = null;;
public GisMultiPolygon(MultiPolygon polygon, SimpleFeature simpleFeature) {
super(EnumGISObjectType.POLYGON, simpleFeature);
this.polygon = polygon;
}
public MultiPolygon getPolygon() {
return polygon;
}
public void setPolygon(MultiPolygon polygon) {
this.polygon = polygon;
}
}
2、读取GIS对象代码
package com.elon.shape;
import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import org.geotools.data.FeatureSource;
import org.geotools.data.shapefile.ShapefileDataStore;
import org.geotools.data.shapefile.ShapefileDataStoreFactory;
import org.geotools.feature.FeatureCollection;
import org.geotools.feature.FeatureIterator;
import org.opengis.feature.Property;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;
import org.opengis.feature.type.AttributeDescriptor;
import com.elon.model.ShapeFieldInfo;
import com.elon.model.gismodel.GISObjectBase;
import com.elon.model.gismodel.GISPoint;
import com.elon.model.gismodel.GisLine;
import com.elon.model.gismodel.GisMultiPolygon;
import com.vividsolutions.jts.geom.MultiLineString;
import com.vividsolutions.jts.geom.MultiPolygon;
import com.vividsolutions.jts.geom.Point;
/**
* Shape文件操作公共类。
* @author elon
* @version 2018年6月24日
*/
public class ShapeUtils {
/**
* 读取GIS图层对象。
* @param shpFilePath shp文件路径
* @return 对象列表
*/
@SuppressWarnings("unchecked")
public static <T extends GISObjectBase> List<T> readGisObject(String shpFilePath) {
List<T> gisObjectList = new ArrayList<>();
ShapefileDataStore dataStore = buildDataStore(shpFilePath);
try {
String typeName = dataStore.getTypeNames()[0];
FeatureSource<SimpleFeatureType, SimpleFeature> fs = dataStore.getFeatureSource(typeName);
FeatureCollection<SimpleFeatureType, SimpleFeature> fcResult = fs.getFeatures();
System.out.println("fcResult size:" + fcResult.size());
FeatureIterator<SimpleFeature> iter = fcResult.features();
while (iter.hasNext()) {
SimpleFeature sf = iter.next();
Collection<Property> property = sf.getProperties();
Iterator<Property> iterP = property.iterator();
while (iterP.hasNext()) {
Property pro = iterP.next();
if (pro.getValue() instanceof MultiPolygon) {
gisObjectList.add((T) new GisMultiPolygon((MultiPolygon) pro.getValue(), sf));
} else if (pro.getValue() instanceof Point) {
gisObjectList.add((T) new GISPoint((Point) pro.getValue(), sf));
} else if (pro.getValue() instanceof MultiLineString) {
gisObjectList.add((T) new GisLine((MultiLineString) pro.getValue(), sf));
}
}
}
} catch (IOException e) {
e.printStackTrace();
} finally {
dataStore.dispose();
}
return gisObjectList;
}
/**
* 构建ShapeDataStore对象。
* @param shpFilePath shape文件路径。
* @return
*/
public static ShapefileDataStore buildDataStore(String shpFilePath) {
ShapefileDataStoreFactory factory = new ShapefileDataStoreFactory();
try {
ShapefileDataStore dataStore = (ShapefileDataStore) factory
.createDataStore(new File(shpFilePath).toURI().toURL());
if (dataStore != null) {
dataStore.setCharset(Charset.forName("UTF-8"));
}
return dataStore;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}
3、客户端调用代码
package com.elon;
import java.io.File;
import java.util.List;
import com.elon.model.gismodel.GisMultiPolygon;
import com.elon.shape.ShapeUtils;
public class StartupGeoTools {
public static void main(String[] args) {
String workSpacePath = System.getProperty("user.dir");
String shpFilePath = workSpacePath + File.separator + "shape/ne_50m_admin_0_countries/ne_50m_admin_0_countries.shp";
List<GisMultiPolygon> gisObjectList = ShapeUtils.readGisObject(shpFilePath);
System.out.println("gisObjectList size:" + gisObjectList.size());
System.out.println("Start GeoTools success!");
}
}
转载自：https://blog.csdn.net/ylforever/article/details/80813711
