java使用geotools导出shp文件-编程知识

java使用geotools导出shp文件

SHP格式是一种矢量数据格式，用于存储地理信息系统（GIS）数据。
SHP文件由一系列有序的文件组成，我们导出的shp文件包括.shp、.shx、.dbf、.prj以及.fix文件。

.shp（shape）文件：存储矢量地图数据，记录了每个要素的空间位置信息。
.shx（shape index）文件：是索引文件，用于存储.shp文件中要素的位置，加快数据访问速度。
.dbf（dBase）文件：存储矢量数据的属性信息，例如地图上每个点的名称、类型等信息。
.prj（projection）文件：是地图坐标系文件，其中包含地图投影的信息。
.fix文件：fid索引文件

导出shp文件代码实现如下：

	<properties><geotools-version>28.2</geotools-version></properties><dependencies><!-- geotools--><dependency><groupId>org.geotools</groupId><artifactId>gt-main</artifactId><version>${geotools-version}</version></dependency><dependency><groupId>org.geotools</groupId><artifactId>gt-shapefile</artifactId><version>${geotools-version}</version></dependency><dependency><groupId>org.geotools</groupId><artifactId>gt-metadata</artifactId><version>${geotools-version}</version></dependency></dependencies><!-- geotools仓库--><repositories><repository><id>osgeo</id><name>Open Source Geospatial Foundation Repository</name><url>https://repo.osgeo.org/repository/release/</url></repository><repository><id>osgeo-snapshot</id><name>OSGeo Snapshot Repository</name><url>https://repo.osgeo.org/repository/snapshot/</url></repository></repositories></project>

public class ExportShp {/*** 导出shp文件** @param dataPropertiesList 属性列表{属性名：属性值}* @param fileName           导出shp文件名* @param geomType           geometry类型*/private static void exportShp(List<Map<String, Object>> dataPropertiesList, String fileName, String geomType) {//创建保存shp文件夹String saveFolder = "D:/workspace/vector/vector/exportShp/";File dir = new File(saveFolder);if (!dir.exists()) {FileUtil.mkdir(dir);}//shp文件路径String shpFileName = fileName + ".shp";String fileUrl = saveFolder + shpFileName;File file = new File(fileUrl);FeatureWriter<SimpleFeatureType, SimpleFeature> writer = null;ShapefileDataStore ds = null;try {Map<String, Serializable> params = new HashMap<>();params.put(ShapefileDataStoreFactory.URLP.key, file.toURI().toURL());ds = (ShapefileDataStore) new ShapefileDataStoreFactory().createNewDataStore(params);//定义图形信息和属性信息SimpleFeatureTypeBuilder tb = new SimpleFeatureTypeBuilder();//设置坐标系CoordinateReferenceSystem crs84 = CRS.decode("EPSG:4326", true);tb.setCRS(crs84);//设置文件名tb.setName(fileName);//定义导出shp文件地块属性名称String geomProperty = "the_geom";String idProperty = "ID";String nameProperty = "name";String descriptionProperty = "desc";//设置图形类型if ("Polygon".equals(geomType)) {tb.add(geomProperty, Polygon.class);} else if ("MultiPolygon".equals(geomType)) {tb.add(geomProperty, MultiPolygon.class);} else if ("Point".equals(geomType)) {tb.add(geomProperty, Point.class);} else if ("MultiPoint".equals(geomType)) {tb.add(geomProperty, MultiPoint.class);} else if ("LineString".equals(geomType)) {tb.add(geomProperty, LineString.class);} else if ("MultiLineString".equals(geomType)) {tb.add(geomProperty, MultiLineString.class);} else {throw new BizIllegalArgumentException("Geometry中没有该类型：" + geomType);}//设置对应属性类型tb.add(idProperty, String.class);tb.add(nameProperty, String.class);tb.add(descriptionProperty, String.class);//设置默认geometrytb.setDefaultGeometry(geomProperty);//创建ds.createSchema(tb.buildFeatureType());ds.setCharset(StandardCharsets.UTF_8);//设置Writerwriter = ds.getFeatureWriter(ds.getTypeNames()[0],Transaction.AUTO_COMMIT);SimpleFeature feature;for (Map<String, Object> map : dataPropertiesList) {feature = writer.next();//属性赋值  geometry要赋值wkt格式的feature.setAttribute(geomProperty, new WKTReader().read((MapUtil.getStr(map, "geometry"))));feature.setAttribute(idProperty, MapUtil.getStr(map, idProperty));feature.setAttribute(nameProperty, MapUtil.getStr(map, "名称"));String description = MapUtil.getStr(map, "描述");if (CharSequenceUtil.isNotBlank(description)) {feature.setAttribute(descriptionProperty, description);}}writer.write();} catch (IOException | FactoryException | ParseException e) {e.printStackTrace();} finally {//关闭相关流try {if (writer != null) {writer.close();}} catch (IOException e) {e.printStackTrace();}if (ds != null) {ds.dispose();}}}public static void main(String[] args) {List<Map<String,Object>> propertyList = new ArrayList<>();for (int i = 0; i < 3; i++) {Map<String,Object> map = new HashMap<>();map.put("ID", i);map.put("名称", "test" + i);map.put("描述", "测试shp导出" + i);map.put("geometry", "MULTILINESTRING ((114.0888763800001 22.549298400000055, 114.0897166200001 22.54931240800005, 114.09006708000004 22.549318250000056, 114.09104754000009 22.549328150000065))");propertyList.add(map);}exportShp(propertyList, "test", "MultiLineString");}
}