ARCGIS——java在后台生成圆以及与图层相交查询

大体可以分为5个步骤：

1、建立http客户端

2、设置请求参数

3、画出圆图形，并转换为json

4、相交查询操作

5、解析返回json

public void xiangjiao() throws MismatchedDimensionException, FactoryException, TransformException{

String url="";请求的图层url

//创建一个http客户端

   HttpClient client=new DefaultHttpClient(); //创建一个POST请求      HttpPost request=new HttpPost(url); //设置HTTP POST请求参数必须用NameValuePair       List<NameValuePair> params = new ArrayList<NameValuePair>();       params.add(new BasicNameValuePair("f", "json"));//format设置成json   //查询类型-相交查询     params.add(new BasicNameValuePair("spatialRel","esriSpatialRelIntersects"));   //相交查询

    params.add(new BasicNameValuePair("geometryType","esriGeometryPolygon"));

//圆的中心点坐标

double X=120.01075948180949;//经度

double Y=33.37515510419829;//纬度

//EPSG:4326，等同于WGS84坐标系(球面坐标)

//EPSG:3857，等同于900913，由Mercator投影而来，经常用于web地图（平面坐标）

Point p=transform(X,Y,"EPSG:4326","EPSG:3857");//转换为平面坐标系

//以点和半径生成wkt圆 Double radius=100.0;//半径假设为100.0米

int pointNum=30;

               //  生成wkt字符串

        String wktStr="POLYGON (("; int startAngle=0; int endAngle=360; for ( int j = 0; j <= pointNum; j++) { int angle = startAngle + (endAngle - startAngle) * j / pointNum; Double sin = Math.sin(angle * Math.PI / 180); Double cos = Math.cos(angle * Math.PI / 180); String x = Double.toString(p.getX() + radius * sin); String y = Double.toString(p.getY()+ radius * cos); if(j==0){ wktStr+=x+" "+y; }else{ wktStr+=","+x+" "+y; } } wktStr+="))"; System.out.print(wktStr); //将wkt转换为json后进行查询

String resultjson=polygonwkttoJson(wktStr);

               params.add(new BasicNameValuePair("geometry",resultjson));//查询图形

               params.add(new BasicNameValuePair("outFields","*"));//查询所有字段

         try {            //设置http Post请求参数             HttpEntity entity = new UrlEncodedFormEntity(params);            request.setEntity(entity);             HttpResponse response=client.execute(request);            if(response.getStatusLine().getStatusCode()==200){//如果状态码为200,就是正常返回                String result=EntityUtils.toString(response.getEntity());                System.out.println(result);//返回的是一个json字符串             }        } catch (ClientProtocolException e) {            e.printStackTrace();            //进行处理操作                    } catch (IOException e) {            //进行处理操作        }

}

//将wkt转换为json private static String polygonwkttoJson(String wkt) { String jsonT = "{\"geometry\":{\"wkid\":3857},\"rings\":[[%s]]}"; String regex = ".+?\\(\\((.+?)\\)\\)"; Pattern pattern = Pattern.compile(regex); Matcher matcher = pattern.matcher(wkt); if (matcher.matches()) {  String group = matcher.group(1).trim(); String[] xys = group.split(","); String[] partArray = new String[xys.length]; for(int i = 0; i < xys.length; i++){ String[] xy = xys[i].trim().split(" "); partArray[i] = String.format("[%s,%s]", xy[0], xy[1]); } String coords = join(partArray, ','); return String.format(jsonT, coords); } else { return ""; }  } public static String join(Object[] array, char separator) {          if (array == null) {              return null;          }          int arraySize = array.length;          int bufSize = (arraySize == 0 ? 0 : ((array[0] == null ? 16 : array[0].toString().length()) + 1) * arraySize);          StringBuffer buf = new StringBuffer(bufSize);            for (int i = 0; i < arraySize; i++) {              if (i > 0) {                  buf.append(separator);              }              if (array[i] != null) {                  buf.append(array[i]);              }          }          return buf.toString();  

    }  

//坐标转换

public static Point transform(double lon, double lat,            String epsgSource, String epsgTarget) throws FactoryException,            MismatchedDimensionException, TransformException {             Coordinate sourceCoord = new Coordinate(lon, lat);        GeometryFactory geoFactory = new GeometryFactory();        Point sourcePoint = geoFactory.createPoint(sourceCoord);         CoordinateReferenceSystem crsSource = CRS.decode(epsgSource);        CoordinateReferenceSystem crsTarget = CRS.decode(epsgTarget);         MathTransform transform = CRS.findMathTransform(crsSource, crsTarget);        Point pointTarget = (Point) JTS.transform(sourcePoint, transform);        //System.out.println(pointTarget.getX()+" "+pointTarget.getY());        return pointTarget;    }