mid、mif文件转shapefile、geojson等格式的数据

mif/mid文件说明

mid、mif文件是Mapinfo用来存储空间数据的一种格式，mif文件保存了地图的属性表结构和空间信息（点、线、面），mid文件则按照mif文件里表结构的顺序在每行保存了各个字段的属性信息，具体介绍可以参考这篇博文

https://ershi.blog.csdn.net/article/details/99696139

mid、mif文件如何转成我们常见的shapefile、geojson等格式的数据

下面的方法，其中包括转wkt、geometry、SimpleFeature等格式的都可以作为参考（以线数据为例），直接上代码

需要注意的是：DataUtilities.createType方法创建要素时，String类型的字段长度默认是254，如果字段很多和要素也很多，dbf文件会比正常变大很多，如果需要自定义String类型长度，可以看一下DataUtilities类源码，重写一下；

    private void roadMidMiftoShp(String path,String mid,String mif){//List<LineString> lineList = new ArrayList<>();List<List<String>> midRows = loadMidFile(new File(mid));logger.info("加载mid结束");List<String> colField = new ArrayList<>();Map<Integer, List<List<Double>>> lineRows = new HashMap<>();loadMifFile(new File(mif),true,colField,lineRows);logger.info("加载mif结束");List<SimpleFeature> lineFeatures = new ArrayList<>();String typeSpec = "the_geom:LineString:srid=4326";for (String col : colField){typeSpec = typeSpec + "," + col + ":String";}try {SimpleFeatureType featureType = DataUtilities.createType("dsline",typeSpec);SimpleFeatureBuilder linefeatureBuilder = new SimpleFeatureBuilder(featureType);for (int i = 0; i < midRows.size(); i++){for (int j = 0; j < colField.size(); j++){linefeatureBuilder.set(colField.get(j),midRows.get(i).get(j));}SimpleFeature featureLine = linefeatureBuilder.buildFeature(String.valueOf(i));String lineStr = "LINESTRING(";List<List<Double>> lineRow = lineRows.get(i);for (List<Double> line : lineRow){lineStr = lineStr + line.get(0) + " " + line.get(1) + ",";}lineStr = lineStr.substring(0,lineStr.length()-1) + ")";LineString roadLine = createLineByWKT(lineStr);featureLine.setDefaultGeometry(roadLine);lineFeatures.add(featureLine);}
//            List<Geometry> geometryList = featuresToGeometrys(lineFeatures);
//            lineList = toSimpleLine(geometryList);}catch (Exception e){logger.error("roadMidMiftoLine异常：", e);}String lineFile = path + File.separator  + "line.shp";String lineJson = path + File.separator  + "line.geojson";featureToGeojson(lineJson , lineFeatures);featureToShp(lineFile , lineFeatures);logger.info("转换shp结束");}

    public List<List<String>> loadMidFile(File file) {List<List<String>> midRows= new ArrayList<>();try {BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(file), "gbk"));String line;while ((line = reader.readLine()) != null) {List<String> cols = Arrays.asList(line.split(",",-1));if (cols.size() > 0) {for (int i = 0; i < cols.size(); i++) {String value = cols.get(i).replace("\"", "");cols.set(i, value);}midRows.add(cols);}}reader.close();} catch (FileNotFoundException e) {logger.error("loadMidFile()：", e);} catch (IOException e) {logger.error("loadMidFile()：", e);}return midRows;}public void loadMifFile(File file, Boolean isLoadMifData,List<String> colField,Map<Integer, List<List<Double>>> lineRows) {//colField 为mid文件里各个值对应的字段try {BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(file), "gbk"));String line;while ((line = reader.readLine()) != null) {if (line.toUpperCase().startsWith("COLUMNS")) {int num = Integer.parseInt(line.substring("Columns ".length()));for (int i = 0; i < num; i++) {line = reader.readLine().trim();List<String> cols = Arrays.asList(line.split(","));if (cols.size() > 0) {colField.add(cols.get(0).split(" ")[0].trim());}}if (isLoadMifData) {//装载mif里的geo数据(点，线，面不同类型)loadMifFileGeoDatas(reader,lineRows);}break;}}reader.close();} catch (Exception e) {logger.error("loadMifFile()：", e);}}//如果geo数据为线public void loadMifFileGeoDatas(BufferedReader reader,Map<Integer, List<List<Double>>> lineRows)  {Integer rowIndex = -1;try {String line;while ((line = reader.readLine()) != null) {List<List<Double>> lines = new ArrayList<>();line = line.trim();if (line.toUpperCase().contains("NONE")){lineRows.put(++rowIndex, lines);}if (line.toUpperCase().startsWith("LINE")) {List<String> point = Arrays.asList(line.split(" "));if (point.size() == 5) {List<Double> point1 = new ArrayList<>();point1.add(Double.parseDouble(point.get(1)));point1.add(Double.parseDouble(point.get(2)));lines.add(point1);List<Double> point2 = new ArrayList<>();point2.add(Double.parseDouble(point.get(3)));point2.add(Double.parseDouble(point.get(4)));lines.add(point2);}lineRows.put(++rowIndex, lines);}if (line.startsWith("Pline")) {int num = Integer.parseInt(line.substring("Pline ".length()));for (int i = 0; i < num; i++) {line = reader.readLine().trim();List<String> point = Arrays.asList(line.split(" "));if (point.size() == 2) {List<Double> points = new ArrayList<>();points.add(Double.parseDouble(point.get(0)));points.add(Double.parseDouble(point.get(1)));lines.add(points);}}lineRows.put(++rowIndex, lines);}}reader.close();} catch (Exception e) {logger.error("loadMifFileGeoDatas()：", e);}}public LinkedHashMap<String, Object> getGeometryMap(Map<Integer, List<List<Double>>> lineRows,Integer rowIdx) {if (lineRows!= null) {List<List<Double>> line = lineRows.getOrDefault(rowIdx, null);LinkedHashMap<String, Object> geometryMap = new LinkedHashMap<String, Object>() {{put("type", "LineString");put("coordinates", line);}};return geometryMap;}return null;}

    public LineString createLineByWKT(String lineStr) throws ParseException {GeometryFactory geometryFactory = JTSFactoryFinder.getGeometryFactory(null);WKTReader reader = new WKTReader( geometryFactory );LineString line = (LineString) reader.read(lineStr);return line;}public void featureToShp(String path, List<SimpleFeature> outFeatures){try {FileDataStoreFactorySpi factory = new ShapefileDataStoreFactory();File file = new File(path);if (file.exists()) {return;}Map map = Collections.singletonMap("url", file.toURI().toURL());ShapefileDataStore dataStore = (ShapefileDataStore)factory.createNewDataStore(map);SimpleFeatureType featureType =outFeatures.get(0).getType();dataStore.createSchema(featureType);dataStore.forceSchemaCRS(CRS.decode("EPSG:4326"));Transaction transaction = new DefaultTransaction("create");String typeName = dataStore.getTypeNames()[0];SimpleFeatureSource featureSource = dataStore.getFeatureSource(typeName);if (featureSource instanceof SimpleFeatureStore) {SimpleFeatureStore featureStore = (SimpleFeatureStore) featureSource;SimpleFeatureCollection collection = new ListFeatureCollection(featureType, outFeatures);featureStore.setTransaction(transaction);try {featureStore.addFeatures(collection);transaction.commit();} catch (Exception problem) {problem.printStackTrace();transaction.rollback();} finally {transaction.close();}} else {logger.info(typeName + " does not support read/write access");}}catch (Exception e){logger.error("featureToShp异常：",e);}}public static void featureToGeojson(String path, List<SimpleFeature> outFeatures){Writer gjsonWriter = null;try{File file = new File(singleRoadPath);if (file.exists()) {file.delete();}if (outFeatures.isEmpty()) {return;}FeatureJSON featureJSON = new FeatureJSON(new GeometryJSON(6));gjsonWriter = new OutputStreamWriter(new FileOutputStream(singleRoadPath), StandardCharsets.UTF_8);featureJSON.writeFeatureCollection(new ListFeatureCollection(outFeatures.get(0).getType(), outFeatures), gjsonWriter);}catch (Exception e){logger.error("feature写入异常：" + e);}finally {try{if (gjsonWriter != null) {gjsonWriter.flush();gjsonWriter.close();}}catch (IOException ie){logger.error("流关闭异常：" + ie);}}}public static List<LineString> toSimpleLine(List<? extends Geometry> geometryList) {List<LineString> simpleLineList = new ArrayList<>();for (Geometry geometry : geometryList) {if (geometry instanceof MultiLineString) {for (int j = 0; j < geometry.getNumGeometries(); j += 1) {simpleLineList.add((LineString) geometry.getGeometryN(j));}} else if (geometry instanceof LineString) {simpleLineList.add((LineString) geometry);}}return simpleLineList;}

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mid、mif文件转shapefile、geojson等格式的数据

mif/mid文件说明

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