GPX Parser for Java?

Question

Are there any Java libraries for parsing GPX files? I need to parse many GPX files into our own data structure (our own database).

Answer 1

This question is too old and so do the answers. Thanks to the open source world, we have now jgpx, on google code (forked multiple times on github) and GPXParser, on sourceforge.net. There are also a lot of results for a search on Github.

I'm not sure which one is more mature (one of them is marked as Alpha) but you can try them and let us know here.

Edit

Have a look at processing-gpx, it seems promising.

Here is a quick example

import tomc.gpx.*;

// outside setup()
GPX gpx;

  // inside setup()
  gpx = new GPX(this);

  // when you want to load data
  gpx.parse("test.gpx"); // or a URL

  // inside draw()
  for (int i = 0; i < gpx.getTrackCount(); i++) {
    GPXTrack trk = gpx.getTrack(i);
    // do something with trk.name
    for (int j = 0; j < trk.size(); j++) {
      GPXTrackSeg trkseg = trk.getTrackSeg(j);
      for (int k = 0; k < trkseg.size(); k++) {
        GPXPoint pt = trkseg.getPoint(k);
        // do something with pt.lat or pt.lon
      }
    }
  }

  for (int i = 0; i < gpx.getWayPointCount(); i++) {
    GPXWayPoint wpt = gpx.getWayPoint(i);
    // do something with wpt.lat or wpt.lon or wpt.name or wpt.type
  }

Answer 2

After some research, there is really no Java API/Lib for parsing GPX files, but I found a nice approach for parsing it using JAXB

Using this Tutorial: http://www.oracle.com/technetwork/articles/javase/index-140168.html

Steps:
1. Download GPX 1.0 and 1.1 Schema file (xsd)
2. Generate Java File from it using Eclipse Plugin
3. Init JAXBContext with package name of generated GPX java files (mine was "topografix.gpx.schema10")
4. Parse GPX File

JAXBContext jc = JAXBContext.newInstance("topografix.gpx.schema10");
Unmarshaller unmarshaller = jc.createUnmarshaller();
Gpx root = (Gpx) unmarshaller.unmarshal(new File("sample.gpx"));
List<Trk> tracks = root.getTrk();
....

Answer 3

Very nice. However, I needed to do:

    GpxType gpx = null;
    try {
        JAXBContext jc = JAXBContext.newInstance(PACKAGE_NAME);
        Unmarshaller unmarshaller = jc.createUnmarshaller();
        JAXBElement<GpxType> root = (JAXBElement<GpxType>)unmarshaller
            .unmarshal(new File(TEST_FILE));
        gpx = root.getValue();
    } catch(JAXBException ex) {
       // TODO
    }

    List<TrkType> tracks = gpx.getTrk();
    for(TrkType track : tracks) {
        System.out.println(track.getName());
    }

BTW I used http://www.topografix.com/GPX/1/1.

-Ken

Answer 4

Ready to use, open source, and fully functional java GpxParser (and much more) here https://sourceforge.net/projects/geokarambola/

Details here https://plus.google.com/u/0/communities/110606810455751902142

With the above library parsing a GPX file is a one liner:

Gpx gpx = GpxFileIo.parseIn( "SomeGeoCollection.gpx" ) ;

Getting its points, routes or tracks trivial too:

ArrayList<Route> routes = gpx.getRoutes( ) ;

Answer 5

I'm not aware of any library specialized in parsing GPX files, but since GPX is XML you can use your preferred Java XML parser for reading it.
The GPX format is documented here (includes XSD schema): http://www.topografix.com/gpx.asp