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Mandroid
Asked: 2024-11-08 18:23:36 +0800 CST

Geotools：从 ShapefileDataStore 创建 SimpleFeatureWriter 时出错

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我正在尝试编写一个 Shapefile：

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 不能转换为类 org.geotools.data.simple.SimpleFeatureWriter（org.geotools.data.InProcessLockingManager$1 和 org.geotools.data.simple.SimpleFeatureWriter 位于加载器“app”的未命名模块中）

我这里遗漏了什么部分？

geotools

1 个回答

  1. Best Answer

    基本上，正如错误所说，您无法转换为SimpleFeatureWriter。因此，您应该这样做：

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

    正如我在 Shapefile 的注释中所说，您必须调用几何属性the_geom：

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

    经过这两项更改后，以下代码就可以正常工作：

        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());
    • 1

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