Geotools Vector ShapeFile 对矢量文件进行坐标系转换，并且保存

//坐标转换(基于矢量 Geometry)
Geometry transformGeometryCRS(Geometry srcGeom,String srcEpsgId,String dstEpsgId){
  try{
    CoordinateReferenceSystem srcCRS = CRS.decode(srcEpsgId);
    CoordinateReferenceSystem dstCRS = CRS.decode(dstEpsgId);
    Geometry geom = FeatureUtils.transformGeometryCRS(srcGeom,srcCRS,dstCRS);
    return geom;
  }catch (Exception e){
    e.printStackTrace();
    return  null;
  }
}

/**
 * 坐标转换
 * @return
 */
public static Geometry transformGeometryCRS(Geometry srcGeom, CoordinateReferenceSystem srcCRS ,CoordinateReferenceSystem  dstCRS){
  try{
    boolean lenient = true; // allow for some error due to different datums
    MathTransform transform = CRS.findMathTransform( srcCRS, dstCRS,lenient);
    Geometry newGeom = JTS.transform(srcGeom, transform);
    return newGeom;
  }catch (Exception e){
    e.printStackTrace();
    return null;
  }
}

/**
 * 坐标转换
 * @return
 */
public static boolean transformFile(String shpFile,String epsgId,String dstFile){

  try{
    CoordinateReferenceSystem dstCRS = CRS.decode(epsgId);

    //打开shp文件
    File file = new File (shpFile);
    ShapefileDataStore featureSource = new ShapefileDataStore(file.toURL());
    CoordinateReferenceSystem srcCRS = featureSource.getSchema().getCoordinateReferenceSystem();
    SimpleFeatureType featureType = featureSource.getSchema();
    SimpleFeatureTypeImpl typeImpl = (SimpleFeatureTypeImpl)featureType;

    //创建新的shapefile
    File newFile = new File(dstFile);
    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);
    SimpleFeatureType newType = SimpleFeatureTypeBuilder.retype(featureType,dstCRS);
    newDataStore.createSchema(newType);

    //处理单个要素
    String typeName = newDataStore.getTypeNames()[0];
    SimpleFeatureSource newFeatureSource = newDataStore.getFeatureSource(typeName);
    Transaction transaction = new DefaultTransaction("Reproject");
    FeatureWriter<SimpleFeatureType, SimpleFeature> writer = newDataStore.getFeatureWriter(newDataStore.getTypeNames()[0], Transaction.AUTO_COMMIT);
    SimpleFeatureIterator iter = featureSource.getFeatureSource().getFeatures().features();
    while(iter.hasNext()){
      SimpleFeature feature = (SimpleFeature) iter.next();

      SimpleFeature newFeature = writer.next();
      newFeature.setAttributes(feature.getAttributes());

      Geometry geometry = (Geometry) feature.getDefaultGeometry();
      Geometry newGeom = FeatureUtils.transformGeometryCRS(geometry,srcCRS,dstCRS);

      newFeature.setDefaultGeometry(newGeom);
    }

    writer.write();
    writer.close();

    iter.close();

    return true;
  }catch (Exception e){
    e.printStackTrace();
    return false;
  }
}