java已知点坐标和半径如何发布shapefile圆文件
时间: 2024-02-20 21:58:47 浏览: 30
要在Java中发布shapefile圆文件,可以使用第三方库来实现。以下是一个使用GeoTools库发布shapefile圆文件的示例代码:
```java
import java.io.File;
import java.io.IOException;
import org.geotools.data.FeatureWriter;
import org.geotools.data.shapefile.ShapefileDataStore;
import org.geotools.data.shapefile.ShapefileDataStoreFactory;
import org.geotools.feature.simple.SimpleFeatureBuilder;
import org.geotools.feature.simple.SimpleFeatureTypeBuilder;
import org.geotools.geometry.jts.JTSFactoryFinder;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;
import org.opengis.geometry.Geometry;
import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.GeometryFactory;
import com.vividsolutions.jts.geom.Point;
public class PublishShapefileCircle {
public static void main(String[] args) throws IOException {
// 创建圆心点
GeometryFactory geometryFactory = JTSFactoryFinder.getGeometryFactory();
Coordinate center = new Coordinate(116.3975, 39.9085); // 圆心坐标
Point point = geometryFactory.createPoint(center);
// 添加圆形要素
SimpleFeatureTypeBuilder typeBuilder = new SimpleFeatureTypeBuilder();
typeBuilder.setName("Circle");
typeBuilder.setCRS(DefaultGeographicCRS.WGS84); // 设置坐标系
typeBuilder.add("geometry", Point.class); // 添加几何字段
typeBuilder.add("radius", Double.class); // 添加半径字段
SimpleFeatureType featureType = typeBuilder.buildFeatureType();
SimpleFeatureBuilder featureBuilder = new SimpleFeatureBuilder(featureType);
featureBuilder.add(point); // 设置圆心点
featureBuilder.add(1000.0); // 设置半径
SimpleFeature feature = featureBuilder.buildFeature(null);
// 创建shapefile文件并保存圆形要素
ShapefileDataStoreFactory dataStoreFactory = new ShapefileDataStoreFactory();
File file = new File("circle.shp");
Map<String, Serializable> params = new HashMap<String, Serializable>();
params.put("url", file.toURI().toURL());
params.put("create spatial index", Boolean.TRUE);
ShapefileDataStore dataStore = (ShapefileDataStore) dataStoreFactory.createNewDataStore(params);
dataStore.createSchema(featureType);
String typeName = dataStore.getTypeNames()[0];
FeatureWriter<SimpleFeatureType, SimpleFeature> writer = dataStore.getFeatureWriter(typeName, Transaction.AUTO_COMMIT);
writer.hasNext();
writer.write();
writer.close();
dataStore.dispose();
}
}
```
在这个示例代码中,我们使用GeoTools库创建一个shapefile文件,并保存一个圆形要素。其中,我们使用了JTS库来创建圆心点,使用SimpleFeatureTypeBuilder来定义图层的字段信息,使用SimpleFeatureBuilder来创建具体的要素,最后使用ShapefileDataStore来保存shapefile文件。在保存时,需要指定文件名以及是否创建空间索引。
值得注意的是,该示例代码中使用的坐标系为WGS84。如果需要使用其他坐标系,需要修改设置CRS的代码。另外,如果要添加更多的圆形要素,只需要重复添加要素的步骤即可。