GeoJSON转ArcGIS的EsriJson：转换工具与代码实现

这次遇到了一个小问题，postgresql只能到处geojson（毕竟是一个 标准 格式），而客户需求的是ArcGIS支持的EsriJson格式。需要在数据之间进行一个转换。再网上查阅了一定资料，最后发现下面的代码比较可行。这里分享一下：

主要 代码

package com.cic.analysis.business.utils; import com.alibaba.fastjson.JSON;import com.alibaba.fastjson.JSONObject;import com.cic.common.utils.StringUtils; import java.math.BigDecimal;import java.util.*; public class EsriGeoJsonUtil {//EsriJson转geoJson    public static String esri2geo(String ersiJson){        Map geoMap = new HashMap();        try {            List geoFs = new ArrayList();            geoMap.put("type", "FeatureCollection");            Map esriMap = (Map) JSON.parse(ersiJson);            Object esriFs = esriMap.get("features");            if(esriFs instanceof List){                esriFs = (List<Map<String, Object>>) esriFs;                for(int i=0; i< ((List) esriFs).size(); i++){                    Map esriF = (Map) ((List) esriFs).get(i);                    Map geoF = new HashMap();                    geoF.put("type", "Feature");                    geoF.put("properties", esriF.get("attributes"));                    Map<String, Object> geometry = (Map<String, Object>) esriF.get("geometry");                    if(null != geometry.get("x")){                        geoF.put("geometry", geoPoint(geometry));                    }else if(null != geometry.get("points")){                        geoF.put("geometry", geoPoints(geometry));                    }else if(null != geometry.get("paths")){                        geoF.put("geometry", geoLine(geometry));                    }else if(null != geometry.get("rings")){                        geoF.put("geometry", geoPoly(geometry));                    }                    geoFs.add(geoF);                }                geoMap.put("features", geoFs);            }        }catch (Exception e){            e.printStackTrace();        }        return new JSONObject(geoMap).toString();    }    //geoJosn转EsriJson    public static String geo2ersi(String geoJson, String idAttribute){        Map esriMap = new HashMap();        try {            Map geoMap = (Map) JSON.parse(geoJson);            esriMap = getEsriGeo(geoMap, idAttribute);            Map spatialReference = new HashMap();            spatialReference.put("wkid", 4326);            esriMap.put("spatialReference",spatialReference);        }catch (Exception e){            e.printStackTrace();        }        return new JSONObject(esriMap).toString();    }       public static Map getEsriGeo(Map geoMap, String idAttribute){        Map esriMap = new HashMap();        idAttribute = StringUtils.isNotEmpty(idAttribute)? idAttribute:"OBJECTID";        String type = geoMap.get("type").toString();        switch (type){            case "Point":                List<BigDecimal> coords = (List<BigDecimal>) geoMap.get("coordinates");                esriMap.put("x", coords.get(0));                esriMap.put("y", coords.get(1));                break;            case "MultiPoint":                esriMap.put("points",geoMap.get("coordinates"));                break;            case "LineString":                List<Object> coordsList = new ArrayList<>();                coordsList.add(geoMap.get("coordinates"));                esriMap.put("paths",coordsList);                break;            case "MultiLineString":                esriMap.put("paths",geoMap.get("coordinates"));                break;            case "Polygon":                List<List<List<BigDecimal>>> coordinates = (List<List<List<BigDecimal>>>) geoMap.get("coordinates");                List<List<List<BigDecimal>>> rings = orientRings(coordinates);                esriMap.put("rings", rings);                break;            case "MultiPolygon":                List<List<List<List<BigDecimal>>>> mcoordinates = (List<List<List<List<BigDecimal>>>>) geoMap.get("coordinates");                List<List<List<BigDecimal>>> mrings = flattenMultiPolygonRings(mcoordinates);                esriMap.put("rings", mrings);                break;            case "Feature":                if (null != geoMap.get("geometry")) {                    Map geometry = getEsriGeo((Map) geoMap.get("geometry"), idAttribute);                    esriMap.put("geometry", geometry);                }                if(null != geoMap.get("properties")){                    Map properties = (Map) geoMap.get("properties");                    if (null != geoMap.get("id")) {                        properties.put(idAttribute, geoMap.get("id"));                    }                    esriMap.put("attributes", properties);                }                break;            case "FeatureCollection":                List<Object> esriFs = new ArrayList<>();                List<Map> features = (List<Map>) geoMap.get("features");                for (int i = 0; i < features.size(); i++) {                    esriFs.add(getEsriGeo(features.get(i), idAttribute));                }                esriMap.put("features", esriFs);                esriMap.put("geometryType","esriGeometryPolygon");                break;            case "GeometryCollection":                List<Object> esriFsc = new ArrayList<>();                List<Map> geometries = (List<Map>) geoMap.get("geometries");                for (int i = 0; i < geometries.size(); i++) {                    esriFsc.add(getEsriGeo(geometries.get(i), idAttribute));                }                esriMap.put("geometries", esriFsc);                esriMap.put("geometryType","esriGeometryPolygon");                break;        }        return esriMap;    }      public static Map geoPoint(Map<String, Object> geometry){        Map geo = new HashMap();        geo.put("type", "point");        BigDecimal x = (BigDecimal) geometry.get("x");        BigDecimal y = (BigDecimal) geometry.get("y");        List<BigDecimal> coords = new ArrayList<>();        coords.add(x);        coords.add(y);        geo.put("coordinates", coords);        return geo;    }     public static Map geoPoints(Map<String, Object> geometry){        Map geo = new HashMap();        List<Object> points = (List<Object>) geometry.get("points");        if(points.size()==1){            geo.put("type", "Point");            geo.put("coordinates", points.get(0));        }else{            geo.put("type", "MultiPoint");            geo.put("coordinates", points);        }        return geo;    }     public static Map geoLine(Map<String, Object> geometry){        Map geo = new HashMap();        List<Object> paths = (List<Object>) geometry.get("paths");        if(paths.size()==1){            geo.put("type", "LineString");            geo.put("coordinates", paths.get(0));        }else{            geo.put("type", "MultiLineString");            geo.put("coordinates", paths);        }        return geo;    }     public static Map geoPoly(Map<String, Object> geometry){        Map geo = new HashMap();        List<List<List<BigDecimal>>> rings = (List<List<List<BigDecimal>>>) geometry.get("rings");        if(rings.size()==1){            geo.put("type", "Polygon");            geo.put("coordinates", rings);        }else{            List<List<List<List<BigDecimal>>>> coords = new ArrayList();            String type = "";            int len = coords.size() - 1;            for(int i=0; i< rings.size(); i++){                if(ringIsClockwise( rings.get(i))){                    List<List<List<BigDecimal>>> item = new ArrayList<>();                    item.add(rings.get(i));                    coords.add(item);                    len++;                }else{                    coords.get(len).add(rings.get(i));                }            }            if(coords.size() == 1){                type="Polygon";            }else{                type="MultiPolygon";            }            geo.put("type", type);            geo.put("coordinates",coords.size()==1?coords.get(0): coords);        }        return geo;    }     public static boolean ringIsClockwise(List<List<BigDecimal>> rings){        int total = 0;        List<BigDecimal> pt1 = null;        List<BigDecimal> pt2 = null;        for(int i=0; i< rings.size()-1; i++){            pt1 = rings.get(i);            pt2 = rings.get(i+1);            total += (pt2.get(0).doubleValue() - pt1.get(0).doubleValue())*  (pt2.get(1).doubleValue() + pt1.get(1).doubleValue());        }        return total>=0;    }     public static List<List<List<BigDecimal>>> orientRings ( List<List<List<BigDecimal>>> polygon) {        List<List<List<BigDecimal>>> ringsList = new ArrayList<>();        List<List<BigDecimal>> outerRing = closeRing(polygon.get(0));        if (outerRing.size() >= 4) {            if (!ringIsClockwise(outerRing)) {                Collections.reverse(outerRing);            }            ringsList.add(outerRing);            polygon.remove(0);            for (int i = 0; i < polygon.size(); i++) {                List<List<BigDecimal>> hole = closeRing(polygon.get(i));                if (hole.size() >= 4) {                    if (ringIsClockwise(hole)) {                        Collections.reverse(hole);                    }                    ringsList.add(hole);                }            }        }        return ringsList;    }     public static List<List<BigDecimal>> closeRing (List<List<BigDecimal>> coords) {        if (!pointsEqual(coords.get(0), coords.get(coords.size()-1))) {            coords.add(coords.get(0));        }        return coords;    }     public static boolean pointsEqual (List<BigDecimal> a, List<BigDecimal> b) {        for (int i = 0; i < a.size(); i++) {            if (a.get(i).compareTo(b.get(i)) != 0) {                return false;            }        }        return true;    }     public static List<List<List<BigDecimal>>> flattenMultiPolygonRings (List<List<List<List<BigDecimal>>>> rings) {        List<List<List<BigDecimal>>> polygonList = new ArrayList<>();        for (int i = 0; i < rings.size(); i++) {            List<List<List<BigDecimal>>> polygons = orientRings(rings.get(i));            for (int x = polygons.size() - 1; x >= 0; x--) {                List<List<BigDecimal>> polygon = polygons.get(x);                polygonList.add(polygon);            }        }        return polygonList;    } }

测试代码

package com.cic.analysis.business.utils; import org.junit.Test; import static org.junit.Assert.*; public class EsriGeoJsonUtilTest {     @Test    public void esri2geo() {        String geoJson="{\n" +                " \"type\": \"FeatureCollection\",\n" +                " \"features\": [\n" +                " {\n" +                " \"type\": \"Feature\",\n" +                " \"properties\": {\n" +                " \"color\":\"#dddddd\",\n" +                " \"id\":\"2222\"\n" +                " },\n" +                " \"geometry\": {\n" +                " \"type\": \"Polygon\",\n" +                " \"coordinates\": [\n" +                " [\n" +                " [\n" +                " -9.84375,\n" +                " 55.57834467218206\n" +                " ],\n" +                " [\n" +                " -48.515625,\n" +                " 7.013667927566642\n" +                " ],\n" +                " [\n" +                " 67.1484375,\n" +                " -8.754794702435618\n" +                " ],\n" +                " [\n" +                " 31.9921875,\n" +                " 48.69096039092549\n" +                " ],\n" +                " [\n" +                " -9.84375,\n" +                " 55.57834467218206\n" +                " ]\n" +                " ]\n" +                " ]\n" +                " }\n" +                " }\n" +                " ]\n" +                "}";        System.out.println(EsriGeoJsonUtil.geo2ersi(geoJson,""));     }}

输出结果

{"features":[{"geometry":{"rings":[[[-9.84375,55.57834467218206],[31.9921875,48.69096039092549],[67.1484375,-8.754794702435618],[-48.515625,7.013667927566642],[-9.84375,55.57834467218206]]]},"attributes":{"color":"#dddddd","id":"2222"}}],"spatialReference":{"wkid":4326},"geometryType":"esriGeometryPolygon"}

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