GPX Parser for Java?

Question

Hi

are there some Java API for parsing GPX files? I need to parse many GPX files into our own data structure (our own database).

Thx 4 help

Buju

Answer 1

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

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

Hi,

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