我正在创建一个简单的程序，它从csv文件读取值并根据这些值创建一个shp文件。这是对this example
的轻微修改形状文件似乎已创建，但是当我查看shapefile with a another snippet时，我什么都看不到。我可以使用此程序查看其他示例shapefile。
我的代码中缺少什么？
我的数据：
LAT1, LON1, LAT2, LON2, LAT3, LON3, LAT3, LON3, CITY, NUMBER
10, 10, 20, 20, 30, 30, 10, 10, Trento, 140
我的代码：
public class ShapeReaderWriter {
public static void main(String[] args) throws Exception {
//read the xml file
File file = FileUtils.getFile("D:\\workspaces\\Routeguard\\Xml2Shape\\src\\com\\meteogroup\\conversion\\locations.csv");
List<String> lines = FileUtils.readLines(file, "utf-8");
final SimpleFeatureType TYPE = createFeatureType();
List<SimpleFeature> features = new ArrayList<SimpleFeature>();
GeometryFactory geometryFactory = JTSFactoryFinder.getGeometryFactory(null);
SimpleFeatureBuilder featureBuilder = new SimpleFeatureBuilder(TYPE);
int i = 0;
for(String line : lines){
if (i > 0 && line.trim().length() > 0) { // skip blank lines + header
String tokens[] = line.split("\\,");
Coordinate[] coordinates = createPolygonDescription(tokens, 8); //the number of values the polygon has
String name = tokens[8].trim();
int number = Integer.parseInt(tokens[9].trim());
/* Longitude (= x coord) first ! */
Polygon polygon = geometryFactory.createPolygon(coordinates);
featureBuilder.add(polygon);
featureBuilder.add(name);
featureBuilder.add(number);
SimpleFeature feature = featureBuilder.buildFeature(null);
features.add(feature);
}
i++;
}
/*
* Get an output file name and create the new shapefile
*/
File newFile = getNewShapeFile(file);
ShapefileDataStoreFactory dataStoreFactory = new ShapefileDataStoreFactory();
Map<String, Serializable> params = new HashMap<String, Serializable>();
params.put("url", newFile.toURI().toURL());
params.put("create spatial index", Boolean.TRUE);
ShapefileDataStore newDataStore = (ShapefileDataStore) dataStoreFactory.createNewDataStore(params);
newDataStore.createSchema(TYPE);
/*
* You can comment out this line if you are using the createFeatureType method (at end of
* class file) rather than DataUtilities.createType
*/
//newDataStore.forceSchemaCRS(DefaultGeographicCRS.WGS84);
/*
* Write the features to the shapefile
*/
Transaction transaction = new DefaultTransaction("create");
String typeName = newDataStore.getTypeNames()[0];
SimpleFeatureSource featureSource = newDataStore.getFeatureSource(typeName);
if (featureSource instanceof SimpleFeatureStore) {
SimpleFeatureStore featureStore = (SimpleFeatureStore) featureSource;
/*
* SimpleFeatureStore has a method to add features from a
* SimpleFeatureCollection object, so we use the ListFeatureCollection
* class to wrap our list of features.
*/
SimpleFeatureCollection collection = new ListFeatureCollection(TYPE, features);
featureStore.setTransaction(transaction);
try {
featureStore.addFeatures(collection);
transaction.commit();
} catch (Exception problem) {
problem.printStackTrace();
transaction.rollback();
} finally {
transaction.close();
}
System.exit(0); // success!
} else {
System.out.println(typeName + " does not support read/write access");
System.exit(1);
}
}
private static Coordinate[] createPolygonDescription(String[] tokens, int max) {
Coordinate[] coords = new Coordinate[max / 2];
int j = 0;
for(int i = 0 ; i < max; i = i+2){
Coordinate c = new Coordinate(Double.parseDouble(tokens[i + 1]), Double.parseDouble(tokens[i])); // seems weird but isn't -> lon is the x value, lat is the y
coords[j] = c;
j++;
}
return coords;
}
private static SimpleFeatureType createFeatureType() {
SimpleFeatureTypeBuilder builder = new SimpleFeatureTypeBuilder();
builder.setName("Location");
builder.setCRS(DefaultGeographicCRS.WGS84); // <- Coordinate reference system
// add attributes in order
builder.add("Polygon", Polygon.class);
builder.length(15).add("Name", String.class); // <- 15 chars width for name field
builder.add("Number", Integer.class);
// build the type
final SimpleFeatureType LOCATION = builder.buildFeatureType();
return LOCATION;
}
private static File getNewShapeFile(File csvFile) {
String path = csvFile.getAbsolutePath();
String newPath = path.substring(0, path.length() - 4) + ".shp";
JFileChooser chooser = new JFileChooser("shp");
chooser.setDialogTitle("Save shapefile");
chooser.setSelectedFile(new File(newPath));
int returnVal = chooser.showSaveDialog(null);
if (returnVal != JFileChooser.APPROVE_OPTION) {
// the user cancelled the dialog
System.exit(0);
}
File newFile = chooser.getSelectedFile();
if (newFile.equals(csvFile)) {
System.out.println("Error: cannot replace " + csvFile);
System.exit(0);
}
return newFile;
}
}
我的观众：
public class Quickstart {
/**
* GeoTools Quickstart demo application. Prompts the user for a shapefile and displays its
* contents on the screen in a map frame
*/
public static void main(String[] args) throws Exception {
// display a data store file chooser dialog for shapefiles
File file = JFileDataStoreChooser.showOpenFile("shp", null);
if (file == null) {
return;
}
FileDataStore store = FileDataStoreFinder.getDataStore(file);
SimpleFeatureSource featureSource = store.getFeatureSource();
// Create a map content and add our shapefile to it
MapContent map = new MapContent();
map.setTitle("Quickstart");
Style style = SLD.createSimpleStyle(featureSource.getSchema());
Layer layer = new FeatureLayer(featureSource, style);
map.addLayer(layer);
// Now display the map
JMapFrame.showMap(map);
}
}
谢谢你，并为这段长片而烦恼！
答案 0 :(得分：4)
看起来geotools几何名称在内部硬编码为“the_geom”。
我遇到了同样的错误，并且通过替换此行来修复：
builder.add("Polygon", Polygon.class);
这一个：
builder.add("the_geom", Polygon.class);
答案 1 :(得分：0)
稳定分支按预期工作，对于任何寻找解决方案的人来说，这是我到目前为止所发现的：
不是你想要的答案，但对我来说，不要再被卡住了！