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;
    }