Convert dxf to gml using kabeja library

Common task when using gis files from different formats is the translation of autocad dxf files into any OGC compatitable format.
Kabeja is an open source JAVA library for dxf parsing.
Details of the Kabeja project may be found here --> http://kabeja.sourceforge.net/

Now we are going to create a java servlet that gets a dxf file and translate it into GML.

First you need to download the kabeja.jar file and reference it within your project. You may download it form here --> http://sourceforge.net/projects/kabeja/?source=typ_redirect. Zip file contains the kabeja.jar and other goodies of the project. For our example to work kabeja.jar should be just enough.
If you are using maven (no need to download kabeja.jar) the following entry within pom.xml should be enough -->

<dependency>
            <groupId>org.kabeja</groupId>
            <artifactId>kabeja</artifactId>
            <version>0.4</version>
</dependency>


Servlet CODE

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package freeopengis.servlets; import java.awt.Color; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStream; import java.io.PrintWriter; import java.util.Iterator; import javax.servlet.ServletConfig; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.kabeja.dxf.DXFColor; import org.kabeja.dxf.DXFDocument; import org.kabeja.dxf.DXFEntity; import org.kabeja.dxf.DXFLayer; import org.kabeja.dxf.DXFLine; import org.kabeja.dxf.DXFPoint; import org.kabeja.dxf.DXFPolyline; import org.kabeja.dxf.DXFText; import org.kabeja.dxf.DXFVertex; import org.kabeja.parser.ParseException; import org.kabeja.parser.Parser; import org.kabeja.parser.ParserBuilder; import org.slf4j.Logger; import org.slf4j.LoggerFactory; public class dxfParser extends HttpServlet { private static final String CONTENT_TYPE = "text/html; charset=UTF-8"; private static Logger logger = LoggerFactory.getLogger(dxfParser.class); //REPLACE THE EPSG CODE WITH THE ONE CORESPONDS TO YOUR DXF FILE private static final String EPSG_CODE = "3857"; private static final long serialVersionUID = 1L; public void init(ServletConfig config) throws ServletException { super.init(config); } public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType(CONTENT_TYPE); //DECLARE THE LOCATION OF THE DXF FILE //THIS MAY BE SUPPLIED AS A PARAMETER TO THE SERVLET String filLoc = "C:/projects/DXFS/TEST1.dxf"; logger.debug(filLoc); PrintWriter out = response.getWriter(); String dxfParsingString = ""; Parser parser = ParserBuilder.createDefaultParser(); StringBuilder buffer = new StringBuilder(); buffer.append("<wfs:FeatureCollection xmlns:wfs=\"http://www.opengis.net/wfs\">"); try { InputStream in = null; in = new FileInputStream(filLoc); //PARSE THE SUPPLIED DXF FILE parser.parse(in, "UTF-8"); //get the documnet and its layers DXFDocument doc = parser.getDocument(); Iterator lyrsIt = doc.getDXFLayerIterator(); int counter = 0; //Loop through layers found while (lyrsIt.hasNext()) { DXFLayer layer = (DXFLayer) lyrsIt.next(); System.out.println("layername="+layer.getName()); String lyrname = layer.getName(); int lyrcolor = layer.getColor(); String rgbcolor = DXFColor.getRGBString(lyrcolor); String [] cols = rgbcolor.split(","); //convert the layer color to hex color code Color mycolor = new Color(Integer.parseInt(cols[0]),Integer.parseInt(cols[1]),Integer.parseInt(cols[2])); String hex = "#"+Integer.toHexString(mycolor.getRGB()).substring(2); Iterator lyrTypesExist = layer.getDXFEntityTypeIterator(); while (lyrTypesExist.hasNext()) { String type = (String) lyrTypesExist.next(); Iterator entities = layer.getDXFEntities(type).iterator(); //loop through layer entities while (entities.hasNext()) { DXFEntity entity = (DXFEntity) entities.next(); String entType = entity.getType(); System.out.println("entType found="+entType); if (entType.equals("LWPOLYLINE") || entType.equals("POLYLINE")) { //System.out.println("LWPOLYLINE FOUND IN LAYER "+lyrname); counter = counter+1; DXFPolyline poly = (DXFPolyline) entity; int vertCount = poly.getVertexCount(); //System.out.println("VERTS COUNT="+vertCount); buffer.append("<gml:featureMember xmlns:gml=\"http://www.opengis.net/gml\">"); buffer.append("<feature:features xmlns:feature=\"http://mapserver.gis.umn.edu/mapserver\" >"); buffer.append("<feature:geometry>"); buffer.append("<gml:LineString srsName=\"http://www.opengis.net/def/crs/EPSG/0/"+EPSG_CODE+"\"><gml:coordinates xmlns:gml=\"http://www.opengis.net/gml\" decimal=\".\" cs=\",\" ts=\"\">"); for (int i=0;i<vertCount;i++) { DXFVertex vertex = poly.getVertex(i); double vertX = vertex.getPoint().getX(); double vertY = vertex.getPoint().getY(); buffer.append(vertX); buffer.append(","); buffer.append(vertY); buffer.append(" "); } buffer.append("</gml:coordinates></gml:LineString>"); buffer.append("</feature:geometry>"); buffer.append("<feature:id>"); buffer.append(counter); buffer.append("</feature:id>"); buffer.append("<feature:layername>"); buffer.append(lyrname); buffer.append("</feature:layername>"); buffer.append("<feature:type>"); buffer.append(entType); buffer.append("</feature:type>"); buffer.append("<feature:label>"); buffer.append(" "); buffer.append("</feature:label>"); buffer.append("<feature:color>"); buffer.append(hex); buffer.append("</feature:color>"); buffer.append("</feature:features>"); buffer.append("</gml:featureMember>"); } if ( entType.equals("LINE")) { counter = counter+1; //System.out.println("LINE FOUND"); DXFLine line = (DXFLine) entity; double vertX1 = line.getStartPoint().getX(); double vertY1 = line.getStartPoint().getY(); double vertX2 = line.getEndPoint().getX(); double vertY2 = line.getEndPoint().getY(); buffer.append("<gml:featureMember xmlns:gml=\"http://www.opengis.net/gml\">"); buffer.append("<feature:features xmlns:feature=\"http://mapserver.gis.umn.edu/mapserver\" >"); buffer.append("<feature:geometry>"); buffer.append("<gml:LineString srsName=\"http://www.opengis.net/def/crs/EPSG/0/"+EPSG_CODE+"\"><gml:coordinates xmlns:gml=\"http://www.opengis.net/gml\" decimal=\".\" cs=\",\" ts=\"\">"); buffer.append(vertX1); buffer.append(","); buffer.append(vertY1); buffer.append(" "); buffer.append(vertX2); buffer.append(","); buffer.append(vertY2); buffer.append(" "); buffer.append("</gml:coordinates></gml:LineString>"); buffer.append("</feature:geometry>"); buffer.append("<feature:id>"); buffer.append(counter); buffer.append("</feature:id>"); buffer.append("<feature:layername>"); buffer.append(lyrname); buffer.append("</feature:layername>"); buffer.append("<feature:type>"); buffer.append(entType); buffer.append("</feature:type>"); buffer.append("<feature:label>"); buffer.append(" "); buffer.append("</feature:label>"); buffer.append("<feature:color>"); buffer.append(hex); buffer.append("</feature:color>"); buffer.append("</feature:features>"); buffer.append("</gml:featureMember>"); } if ( entType.equals("POINT")) { counter = counter+1; //System.out.println("POINT FOUND"); DXFPoint point = (DXFPoint) entity; double pointX = point.getX(); double pointY = point.getY(); buffer.append("<gml:featureMember xmlns:gml=\"http://www.opengis.net/gml\">"); buffer.append("<feature:features xmlns:feature=\"http://mapserver.gis.umn.edu/mapserver\" >"); buffer.append("<feature:geometry>"); buffer.append("<gml:Point srsName=\"http://www.opengis.net/def/crs/EPSG/0/"+EPSG_CODE+"\"><gml:coordinates xmlns:gml=\"http://www.opengis.net/gml\" decimal=\".\" cs=\",\" ts=\"\">"); buffer.append(pointX); buffer.append(","); buffer.append(pointY); buffer.append(" "); buffer.append("</gml:coordinates></gml:Point>"); buffer.append("</feature:geometry>"); buffer.append("<feature:id>"); buffer.append(counter); buffer.append("</feature:id>"); buffer.append("<feature:layername>"); buffer.append(lyrname); buffer.append("</feature:layername>"); buffer.append("<feature:type>"); buffer.append(entType); buffer.append("</feature:type>"); buffer.append("<feature:label>"); buffer.append(" "); buffer.append("</feature:label>"); buffer.append("<feature:color>"); buffer.append(hex); buffer.append("</feature:color>"); buffer.append("</feature:features>"); buffer.append("</gml:featureMember>"); } if ( entType.equals("TEXT")) { counter = counter+1; //System.out.println("TEXT FOUND"); DXFText text = (DXFText) entity; double vertX = text.getInsertPoint().getX(); double vertY = text.getInsertPoint().getY(); String label = text.getText().replace("\"", " "); buffer.append("<gml:featureMember xmlns:gml=\"http://www.opengis.net/gml\">"); buffer.append("<feature:features xmlns:feature=\"http://mapserver.gis.umn.edu/mapserver\" >"); buffer.append("<feature:geometry>"); buffer.append("<gml:Point srsName=\"http://www.opengis.net/def/crs/EPSG/0/"+EPSG_CODE+"\"><gml:coordinates xmlns:gml=\"http://www.opengis.net/gml\" decimal=\".\" cs=\",\" ts=\"\">"); buffer.append(vertX); buffer.append(","); buffer.append(vertY); buffer.append(" "); buffer.append("</gml:coordinates></gml:Point>"); buffer.append("</feature:geometry>"); buffer.append("<feature:id>"); buffer.append(counter); buffer.append("</feature:id>"); buffer.append("<feature:layername>"); buffer.append(lyrname); buffer.append("</feature:layername>"); buffer.append("<feature:type>"); buffer.append(entType); buffer.append("</feature:type>"); buffer.append("<feature:label>"); buffer.append(label); buffer.append("</feature:label>"); buffer.append("<feature:color>"); buffer.append(hex); buffer.append("</feature:color>"); buffer.append("</feature:features>"); buffer.append("</gml:featureMember>"); } } } } buffer.append("</wfs:FeatureCollection>"); } catch (ParseException e) { e.printStackTrace(); } dxfParsingString = buffer.toString(); buffer.setLength(0); //flush it out.println(dxfParsingString); out.close(); } }