一、引言

数据库中经常存储的格式是符合OGC标准的WKT或WKB，而在网络中经常传输的格式是json，因此我们会经常把各种数据转为geojson的形式以服务形式发出，供客户端使用。当然你硬要用wkt格式也行，没人管你，自己知道就ok，由于涉及到属性数据只是建议geojson比较方便，毕竟WFS也是用的geojson返回的==

二、代码操作

1、服务端

读取shp数据，解析出simplefeature，使用featurejson转化为json，然后拼接输出。

 /*** 后台将shp数据转为geojson，返回* @return*/@RequestMapping("/geojson")@ResponseBodypublic Object shp2geojson(){String shpPath=this.getClass().getResource("/").getFile()+"/file/pointgbk.shp";String  jsonPath=this.getClass().getResource("/").getFile()+"file/point.geojson";Map map = new HashMap();//新建json对象FeatureJSON fjson = new FeatureJSON();JSONObject geojsonObject=new JSONObject();geojsonObject.put("type","FeatureCollection");try{//获取featurecollectionFile file = new File(shpPath);ShapefileDataStore shpDataStore = null;shpDataStore = new ShapefileDataStore(file.toURL());//设置编码
/*            Charset charset = Charset.forName("GBK");shpDataStore.setCharset(charset);*/String typeName = shpDataStore.getTypeNames()[0];SimpleFeatureSource featureSource = null;featureSource =  shpDataStore.getFeatureSource (typeName);SimpleFeatureCollection result = featureSource.getFeatures();SimpleFeatureIterator itertor = result.features();JSONArray array = new JSONArray();//遍历feature转为json对象while (itertor.hasNext()){SimpleFeature feature = itertor.next();StringWriter writer = new StringWriter();fjson.writeFeature(feature, writer);String temp=writer.toString();byte[] b=temp.getBytes("iso8859-1");temp=new String(b,"gbk");System.out.println(temp);JSONObject json =  JSON.parseObject(temp);array.add(json);}geojsonObject.put("features",array);itertor.close();long startTime=System.currentTimeMillis();//将json字符串使用字符流写入文件
/*            File outputfile=new File(jsonPath);BufferedWriter bufferedWriter=new BufferedWriter(new FileWriter(outputfile));bufferedWriter.write(JSON.toJSONString(geojsonObject));bufferedWriter.flush();bufferedWriter.close();*/File outputfile=new File(jsonPath);FileOutputStream fileOutputStream=new FileOutputStream(outputfile);OutputStreamWriter outputStreamWriter=new OutputStreamWriter(fileOutputStream,"utf-8");outputStreamWriter.write(JSON.toJSONString(geojsonObject));outputStreamWriter.flush();outputStreamWriter.close();//将json字符串使用字节流写入文件
/*            File outputfile=new File(jsonPath);BufferedOutputStream bufferedOutputStream=new BufferedOutputStream(new FileOutputStream(outputfile));byte[] bytes= JSON.toJSONString(geojsonObject).getBytes("utf-8");bufferedOutputStream.write(bytes);//fileOutputStream.write(JSON.toJSONString(geojsonObject));bufferedOutputStream.flush();bufferedOutputStream.close();*/long endTime=System.currentTimeMillis();System.out.println("当前程序耗时："+(endTime-startTime)+"ms");}catch(Exception e){map.put("status", "failure");map.put("message", e.getMessage());e.printStackTrace();}return geojsonObject;}

2、返回数据

{"features":[{"geometry":{"coordinates":[508909.854,299887.23],"type":"Point"},"id":"pointgbk.2","type":"Feature","properties":{"ExtendedEn":"{ 83103 } { L31-20201081-24 L31-20201081-24 }","SubClasses":"AcDbEntity:AcDbText:AcDbText","EntityHand":"1522","Text":"37.24","Linetype":"","Layer":"文字层组-标注"}},{"geometry":{"coordinates":[508884.9711,299895.6874],"type":"Point"},"id":"pointgbk.3","type":"Feature","properties":{"ExtendedEn":"{ 83103 } { L31-20201081-25 L31-20201081-25 }","SubClasses":"AcDbEntity:AcDbText:AcDbText","EntityHand":"1523","Text":"37.23","Linetype":"","Layer":"文字层组-标注"}},……],"type":"FeatureCollection"}

三、总结

使用wkt与geojson；

代码操作将shp中的feature转化为geojson；

补充：

geojson转shp

     Map map = new HashMap();GeometryJSON gjson = new GeometryJSON();try{String strJson = cm.getFileContent(jsonPath);JSONObject json = new JSONObject(strJson);JSONArray features = (JSONArray) json.get("features");JSONObject feature0 = new JSONObject(features.get(0).toString());System.out.println(feature0.toString());String strType = ((JSONObject)feature0.get("geometry")).getString("type").toString();Class<?> geoType = null;switch(strType){case "Point":geoType = Point.class;case "MultiPoint":geoType = MultiPoint.class;case "LineString":geoType = LineString.class;case "MultiLineString":geoType = MultiLineString.class;case "Polygon":geoType = Polygon.class;case "MultiPolygon":geoType = MultiPolygon.class;}//创建shape文件对象File file = new File(shpPath);Map<String, Serializable> params = new HashMap<String, Serializable>();params.put( ShapefileDataStoreFactory.URLP.key, file.toURI().toURL() );ShapefileDataStore ds = (ShapefileDataStore) new ShapefileDataStoreFactory().createNewDataStore(params);//定义图形信息和属性信息SimpleFeatureTypeBuilder tb = new SimpleFeatureTypeBuilder();tb.setCRS(DefaultGeographicCRS.WGS84);tb.setName("shapefile");tb.add("the_geom", geoType);tb.add("POIID", Long.class);ds.createSchema(tb.buildFeatureType());//设置编码Charset charset = Charset.forName("GBK");ds.setCharset(charset);//设置WriterFeatureWriter<SimpleFeatureType, SimpleFeature> writer = ds.getFeatureWriter(ds.getTypeNames()[0], Transaction.AUTO_COMMIT);for(int i=0,len=features.length();i<len;i++){String strFeature = features.get(i).toString();Reader reader = new StringReader(strFeature);SimpleFeature feature = writer.next();feature.setAttribute("the_geom",gjson.readMultiPolygon(reader));feature.setAttribute("POIID",i);writer.write();}writer.close();ds.dispose();

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