【解决办法】在打开的时候指定导入模式为三维;参考代码如下:
Workspace workspace = new Workspace();
DatasourceConnectionInfo info = new DatasourceConnectionInfo();info.setServer("");
info.setEngineType(EngineType.VECTORFILE);
Map map = new HashMap<>();
map.put("ImportAs3D", "true");
map.put("FileType","8");
map.put("Charset","DEFAULT");
info.setExtendAttribute(map);
Datasource datasource = workspace.getDatasources().open(info);
DatasetVector datasetVector = (DatasetVector) datasource.getDatasets().get(0);
System.out.println(info.getExtendAttribute());