How to read XML response from a URL in java,?

Question

Hi . I need to write a simple function that takes a URL and processes the response which is XML or JSON, I have checked the Sun website https://swingx-ws.dev.java.net/servlets/ProjectDocumentList , but the HttpRequest object is to be found nowhere, is it possible to do this in Java? I`m writting a rich client end app.

Answer 1

Get your response via a regular http-request, using:

• Apache HttpComponents
• the built-in URLConnection con = new URL("http://example.com").openConnection();

The next step is parsing it. Take a look at this article for a choice of parser.

Answer 2

If you specifically want to use SwingX-WS, then have a look at XmlHttpRequest and JSONHttpRequest.

More on those classes in the XMLHttpRequest and Swing blog post.

Answer 3

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Answer 4

Ok I think I have solves the problem below is a working code

//
package xmlhttp;

import org.jdesktop.http.Response;

import org.jdesktop.http.Session;

import org.jdesktop.http.State;



public class GetXmlHttp{


    public static void main(String[] args) {

        getResponse();

    }

    public static void getResponse()
    {

        final Session session = new Session();

        try {
            String url="http://192.172.2.23:8080/geoserver/wfs?request=GetFeature&version=1.1.0&outputFormat=GML2&typeName=topp:networkcoverage,topp:tehsil&bbox=73.07846689124875,33.67929015631999,73.07946689124876,33.68029015632,EPSG:4326";
            final Response res=session.get(url);
            boolean notDone=true;
            do
            {
                System.out.print(session.getState().toString());

                if(session.getState()==State.DONE)
                {
                    String xml=res.toString();
                    System.out.println(xml);
                    notDone=false;


                }

            }while(notDone);

        } catch (Exception e1) {

            e1.printStackTrace();
        }


    }

}

Answer 5

For xml parsing of an inputstream you can do:

// the SAX way:
XMLReader myReader = XMLReaderFactory.createXMLReader();
myReader.setContentHandler(handler);
myReader.parse(new InputSource(new URL(url).openStream()));

// or if you prefer DOM:
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
Document doc = db.parse(new URL(url).openStream());

But to communicate over http from server to client I prefer using hessian library or springs http invoker lib

Answer 6

If you want to print XML directly onto the screen you can use TransformerFactory

URL url = new URL(urlString); URLConnection conn = url.openConnection();

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); DocumentBuilder builder = factory.newDocumentBuilder(); Document doc = builder.parse(conn.getInputStream());

TransformerFactory factory = TransformerFactory.newInstance(); Transformer xform = factory.newTransformer();

// that’s the default xform; use a stylesheet to get a real one xform.transform(new DOMSource(doc), new StreamResult(System.out));