java ADF 如何将平面坐标转换为经纬度

public void getIdentity(MapEvent exent) {

WebContext ctx = exent.getWebContext();

WebPoint point = (WebPoint)exent.getWebGeometry();

point = (WebPoint)point.toMapGeometry(ctx.getWebMap());

double x=point.getX();

double y=point.getY();

}

此时x，y的值为1070714.3326015235，3765220.3168944316，这应该是平面坐标

WebSpatialReference ws=exent.getWebGeometry().getSpatialReference().getWebSpatialReference((int)esriSRGeoCSType.esriSRGeoCS_NAD1983);

WebPoint point1=(WebPoint)point.project(ws);

double jd=point1.getX();

double wd=point1.getY();

logger.debug("经度："+jd);

logger.debug("纬度："+wd);