view flys-client/src/main/java/de/intevation/flys/client/server/DischargeInfoXML.java @ 4488:5041105d2edd

Check if response code from GGInA is 200 OK Only parse the GGInA response if the status code is 200 OK. This improves the error message if GGInA is not available and shows the real reason instead of a JDOM error while parsing the response.
author Björn Ricks <bjoern.ricks@intevation.de>
date Wed, 14 Nov 2012 10:36:21 +0100
parents 67468c90ca68
children
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package de.intevation.flys.client.server;

import java.io.InputStream;
import java.io.IOException;
import java.io.OutputStream;

import org.w3c.dom.Document;
import org.w3c.dom.Element;

import org.apache.log4j.Logger;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import de.intevation.artifacts.common.ArtifactNamespaceContext;
import de.intevation.artifacts.common.utils.XMLUtils;

import de.intevation.artifacts.httpclient.exceptions.ConnectionException;
import de.intevation.artifacts.httpclient.http.HttpClient;
import de.intevation.artifacts.httpclient.http.HttpClientImpl;
import de.intevation.artifacts.httpclient.http.response.StreamResponseHandler;


/**
 * @author <a href="mailto:raimund.renkert@intevation.de">Raimund Renkert</a>
 */
public class DischargeInfoXML
extends      HttpServlet
{
    private static final Logger logger = Logger.getLogger(DischargeInfoXML.class);


    public static final String ERROR_NO_DISTANCEINFO_FOUND =
        "error_no_dischargeinfo_found";


    public void doGet(HttpServletRequest req, HttpServletResponse resp) {
        logger.info("DischargeInfoXML.doGet");

        String url  = getServletContext().getInitParameter("server-url");

        String gauge = req.getParameter("gauge");

        Document doc = XMLUtils.newDocument();

        XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator(
            doc,
            ArtifactNamespaceContext.NAMESPACE_URI,
            ArtifactNamespaceContext.NAMESPACE_PREFIX);

        Element gaugeEl = ec.create("gauge");
        gaugeEl.setTextContent(gauge);

        doc.appendChild(gaugeEl);

        HttpClient client = new HttpClientImpl(url);

        try {
            InputStream in = (InputStream) client.callService(
                url, "dischargeinfo", doc, new StreamResponseHandler());

            OutputStream out = resp.getOutputStream();

            byte[] b = new byte[4096];
            int i;
            while ((i = in.read(b)) >= 0) {
                out.write(b, 0, i);
            }

            out.flush();
            out.close();
        }
        catch (ConnectionException ce) {
            logger.error(ce, ce);
        }
        catch (IOException ioe) {
            logger.error(ioe, ioe);
        }
    }
}
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