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/*** cad转换为Geojson* @param filePath* @author 388* @return*/public static StringBuffer cad2Geojson(String filePath) {//下面的代码是把要素拼接成指定格式的字符串StringBuffer builder = new StringBuffer();try {//打开这个工作空间//获取文件IFeatureClass featureClass = WorkspaceAGUtil.getCADFeatureClass(filePath, "Polyline");IFeatureLayer featureLayer = new CadFeatureLayer();featureLayer.setFeatureClassByRef(featureClass);// 关键接口ICadDrawingLayers，此接口能获取CAD文件中的分层信息ICadDrawingLayers cadDrawingLayers = (ICadDrawingLayers) featureLayer;IQueryFilter queryFilter = new QueryFilter();//可视要素的where条件queryFilter.setWhereClause(getVisibleClause(cadDrawingLayers));IFeatureCursor featureCursor = featur
