GeoTools读取来自不同PostgreSQL模式的featureSource

首先确保已经安装了PostgreSQL数据存储工具包。然后，可以使用以下代码示例从不同的PostgreSQL模式中读取特征源：

import java.io.IOException;
import org.geotools.data.DataStoreFinder;
import org.geotools.data.FeatureSource;
import org.geotools.data.postgis.PostgisNGDataStoreFactory;
import org.opengis.feature.simple.SimpleFeatureType;
import org.opengis.filter.Filter;

public class ReadFromDifferentPostgreSQLSchemaExample {
  public static void main(String[] args) throws IOException {

    // Define the parameters to connect to the database
    Map<String, Object> params = new HashMap<>();
    params.put(PostgisNGDataStoreFactory.DBTYPE.key, PostgisNGDataStoreFactory.DBTYPE.sample);
    params.put(PostgisNGDataStoreFactory.HOST.key, "localhost");
    params.put(PostgisNGDataStoreFactory.PORT.key, 5432);
    params.put(PostgisNGDataStoreFactory.SCHEMA.key, "my_schema_name");//replace the schema name with the name of your schema
    params.put(PostgisNGDataStoreFactory.USER.key, "my_username");
    params.put(PostgisNGDataStoreFactory.PASSWD.key, "my_password");
    params.put(PostgisNGDataStoreFactory.DATABASE.key, "my_database_name");

    // Create the feature source
    SimpleFeatureType featureType = DataStoreFinder.getDataStore(params)
            .getSchema("my_table_name");//replace the table name with the name of your table
    FeatureSource featureSource = DataStoreFinder.getDataStore(params)
            .getFeatureSource(featureType.getName().toString());

    // Query the feature source
    Filter filter = Filter.INCLUDE;
    try (FeatureIterator iterator = featureSource.getFeatures(filter).features()) {
      while (iterator.hasNext()) {
        SimpleFeature feature = iterator.next();
        System.out.println(feature.getID() + ": " + feature.getAttribute("my_attribute_name"));//replace the attribute name with the name of your attribute
      }
    }
  }
}

代码示例假设数据存储在PostgreSQL数据库中，其中特征源存储在名为“my_table_name”的表格中，而该表格位于名为“my_schema_name”的模式中。替换代码示例中的数据连接参数以适应自己的数据库，并在需要时替换表格名称，属性名称和模式名称。