网站怎么谈设计/杭州哪家seo公司好

#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
本章要描述的功能是如何将GIS对象数据写入shape文件。下面以Point对象为例，线和多边形的处理方式类似。

#三、样例代码

##1、ShapeFieldInfo定义

package com.elon.model;import java.io.Serializable;/*** Shape文件字段信息模型。* * @author elon* @version 2018年6月24日*/
public class ShapeFieldInfo implements Serializable {private static final long serialVersionUID = 6947403344262247581L;/*** 字段名称*/private String fieldName = "";/*** 字段类型*/private Class<?> fieldType = null;public ShapeFieldInfo(String fieldName, Class<?> fieldType) {this.fieldName = fieldName;this.fieldType = fieldType;}@Overridepublic String toString() {return "fieldName:" + fieldName + "|fieldType:" + fieldType.getName();}public String getFieldName() {return fieldName;}public void setFieldName(String fieldName) {this.fieldName = fieldName;}public Class<?> getFieldType() {return fieldType;}public void setFieldType(Class<?> fieldType) {this.fieldType = fieldType;}
}

##2、定义GIS对象的基础模型

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 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;/*** 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,List<ShapeFieldInfo> attrFieldList){this.type = type;this.attrFieldList = attrFieldList;}public EnumGISObjectType getType() {return type;}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 List<ShapeFieldInfo> getAttrFieldList() {return attrFieldList;}public void setAttrFieldList(List<ShapeFieldInfo> attrFieldList) {this.attrFieldList = attrFieldList;}
}

##3、定义GISPoint的模型

package com.elon.model.gismodel;import java.util.List;import com.elon.constant.EnumGISObjectType;
import com.elon.model.ShapeFieldInfo;
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, List<ShapeFieldInfo> attrFieldList) {super(EnumGISObjectType.POINT, attrFieldList);this.point = point;}public Point getPoint() {return point;}public void setPoint(Point point) {this.point = point;}
}

##4、写GISPoint对象到shape文件的代码

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.FeatureWriter;
import org.geotools.data.Transaction;
import org.geotools.data.shapefile.ShapefileDataStore;
import org.geotools.data.shapefile.ShapefileDataStoreFactory;
import org.geotools.feature.FeatureCollection;
import org.geotools.feature.FeatureIterator;
import org.geotools.feature.simple.SimpleFeatureTypeBuilder;
import org.geotools.referencing.crs.DefaultGeographicCRS;
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 {/*** 写GIS对象到Shape文件。* @param dataStore shape文件源* @param gisObjectList 对象列表* @param attrFieldList 属性列表* @throws IOException*/public static <T extends GISObjectBase> void writeShapeFile(ShapefileDataStore dataStore, List<T> gisObjectList,List<ShapeFieldInfo> attrFieldList) throws IOException {if (gisObjectList.isEmpty()) {return;}EnumGISObjectType type = gisObjectList.get(0).getType();// 设置图层对象属性SimpleFeatureType featureType = buildFeatureType(attrFieldList, type);dataStore.createSchema(featureType);dataStore.setCharset(Charset.forName("GBK"));List<SimpleFeature> featureList = buildFeatureList(gisObjectList, type, featureType);// 写数据SimpleFeatureSource featureSource = (SimpleFeatureSource) dataStore.getFeatureSource(dataStore.getTypeNames()[0]);SimpleFeatureStore featureStore = (SimpleFeatureStore) featureSource;SimpleFeatureCollection collection = new ListFeatureCollection(featureType, featureList);Transaction transaction = new DefaultTransaction("create");featureStore.setTransaction(transaction);try {featureStore.addFeatures(collection);transaction.commit();} catch (Exception problem) {problem.printStackTrace();transaction.rollback();} finally {transaction.close();}}/*** 构建feature对象列表。* * @param gisObjectList GIS对象列表* @param type feature类型* @param featureType* @return feature列表*/private static <T extends GISObjectBase> List<SimpleFeature> buildFeatureList(List<T> gisObjectList,EnumGISObjectType type, SimpleFeatureType featureType){List<SimpleFeature> featureList = new ArrayList<>();SimpleFeatureBuilder featureBuilder = new SimpleFeatureBuilder(featureType);for (T gis : gisObjectList) {if (type == EnumGISObjectType.POINT) {featureBuilder.set("the_geom", ((GISPoint)gis).getPoint());}else if (type == EnumGISObjectType.LINE) {featureBuilder.set("the_geom", ((GISLine)gis).getLine());}else if (type == EnumGISObjectType.POLYGON) {featureBuilder.set("the_geom", ((GISMultiPolygon)gis).getPolygon());}else {System.out.println("Invalid gisobject type.");continue;}gis.getAttributeMap().forEach((k, v) -> featureBuilder.set(k, v));featureList.add(featureBuilder.buildFeature(null));}return featureList;}/*** 构建feature类型信息。* * @param attrFieldList 属性字段列表* @param type gis对象类型* @return feature类型*/private static SimpleFeatureType buildFeatureType(List<ShapeFieldInfo> attrFieldList,EnumGISObjectType type) {SimpleFeatureTypeBuilder sb = new SimpleFeatureTypeBuilder();sb.setCRS(DefaultGeographicCRS.WGS84);sb.setName("shape");attrFieldList.forEach((f) -> sb.add(f.getFieldName(), f.getFieldType()));if (type == EnumGISObjectType.POINT) {sb.add("the_geom", Point.class);            }else if (type == EnumGISObjectType.LINE) {sb.add("the_geom", MultiLineString.class); }else if (type == EnumGISObjectType.POLYGON) {sb.add("the_geom", MultiPolygon.class);  }else {System.out.println("Invalid gisobject type.");return null;}return sb.buildFeatureType();}/*** 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;}
}

##5、客户端调用代码

package com.elon;import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;import org.geotools.data.shapefile.ShapefileDataStore;import com.elon.model.ShapeFieldInfo;
import com.elon.model.gismodel.GISPoint;
import com.elon.shape.ShapeUtils;
import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.GeometryFactory;public class StartupGeoTools {public static void main(String[] args) throws IOException {String workSpacePath = System.getProperty("user.dir");List<ShapeFieldInfo> attrFieldList = new ArrayList<>();attrFieldList.add(new ShapeFieldInfo("id", Integer.class));attrFieldList.add(new ShapeFieldInfo("name", String.class));GeometryFactory factory = new GeometryFactory();List<GISPoint> pointList = new ArrayList<>();GISPoint point1 = new GISPoint(factory.createPoint(new Coordinate(20.11, 35.22)), attrFieldList);point1.getAttributeMap().put("id", 6);point1.getAttributeMap().put("name", "111");pointList.add(point1);GISPoint point2 = new GISPoint(factory.createPoint(new Coordinate(50.121, 45.2222)), attrFieldList);point2.getAttributeMap().put("id", 8);point2.getAttributeMap().put("name", "222");pointList.add(point2);String shpFilePath2 = workSpacePath + File.separator + "shape/student/student.shp";ShapefileDataStore dataStore = ShapeUtils.buildDataStore(shpFilePath2);ShapeUtils.writeShapeFile(dataStore, pointList, attrFieldList);dataStore.dispose();System.out.println("Start GeoTools success!");}
}

student.shp是用QGIS建的一个点图层shape文件，有id和name这两个属性。

#四、补充说明
上面写shape文件的方式是全量写的方式，也就是说新增的数据会将旧数据覆盖，不会保留。