Geotools：从 ShapefileDataStore 创建 SimpleFeatureWriter 时出错

Question

我正在尝试编写一个形状文件：

File shapefile = new File(....);
Map<String, Serializable> map = new HashMap();
map.put("url", shapefile.toURI().toURL());
SimpleFeatureTypeBuilder builder = new SimpleFeatureTypeBuilder();
builder.setName("MultiPolygonFeatureType");
CoordinateReferenceSystem crs = DefaultGeographicCRS.WGS84
builder.setCRS(crs);
builder.add("location", MultiPolygon.class);
builder.add("name", String.class);
SimpleFeatureType featureType = builder.buildFeatureType();

ShapefileDataStoreFactory factory = new ShapefileDataStoreFactory();
ShapefileDataStore dataStore = (ShapefileDataStore) factory.createNewDataStore(map);
dataStore.createSchema(featureType);
SimpleFeatureWriter writer = (SimpleFeatureWriter) 
dataStore.getFeatureWriterAppend(dataStore.getTypeNames()[0], new DefaultTransaction());

但这给了我错误：

java.lang.ClassCastException：类 org.geotools.data.InProcessLockingManager$1 无法转换为类 org.geotools.data.simple.SimpleFeatureWriter （org.geotools.data.InProcessLockingManager$1 和 org.geotools.data.simple.SimpleFeatureWriter 位于未命名模块中 加载器“应用程序”）

我在这里缺少什么部分？

Answer 1

基本上，正如错误所示，您无法转换为

SimpleFeatureWriter

。所以 你应该这样做：

FeatureWriter<SimpleFeatureType, SimpleFeature> writer = dataStore.getFeatureWriterAppend(dataStore.getTypeNames()[0], new DefaultTransaction());

正如我在 shapefile 的评论中所说，你必须调用几何属性

the_geom

：

builder.add("the_geom", MultiPolygon.class);

通过这 2 个更改，以下代码确实可以工作：

    File shapefile = new File("/tmp/ian.shp");
    HashMap<String, Serializable> map = new HashMap();
    map.put("url", URLs.fileToUrl(shapefile));
    SimpleFeatureTypeBuilder builder = new SimpleFeatureTypeBuilder();
    builder.setName("MultiPolygonFeatureType");
    CoordinateReferenceSystem crs = DefaultGeographicCRS.WGS84;
    builder.setCRS(crs);
    builder.add("the_geom", MultiPolygon.class);
    builder.add("name", String.class);
    SimpleFeatureType featureType = builder.buildFeatureType();

    ShapefileDataStoreFactory factory = new ShapefileDataStoreFactory();
    ShapefileDataStore dataStore = (ShapefileDataStore) factory.createNewDataStore(map);
    dataStore.createSchema(featureType);
    FeatureWriter<SimpleFeatureType, SimpleFeature> writer = dataStore.getFeatureWriterAppend(dataStore.getTypeNames()[0], new DefaultTransaction());