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Example on how to use GraphHopper in a web-based application
/*
* Licensed to GraphHopper and Peter Karich under one or more contributor
* license agreements. See the NOTICE file distributed with this work for
* additional information regarding copyright ownership.
*
* GraphHopper licenses this file to you under the Apache License,
* Version 2.0 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.graphhopper.http;
import com.graphhopper.GraphHopper;
import com.graphhopper.storage.StorableProperties;
import com.graphhopper.util.Constants;
import com.graphhopper.util.Helper;
import com.graphhopper.util.shapes.BBox;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.inject.Inject;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.json.JSONObject;
/**
* @author Peter Karich
*/
public class InfoServlet extends GHBaseServlet
{
@Inject
private GraphHopper hopper;
@Override
public void doGet( HttpServletRequest req, HttpServletResponse res ) throws ServletException, IOException
{
BBox bb = hopper.getGraphHopperStorage().getBounds();
List list = new ArrayList(4);
list.add(bb.minLon);
list.add(bb.minLat);
list.add(bb.maxLon);
list.add(bb.maxLat);
JSONObject json = new JSONObject();
json.put("bbox", list);
String[] vehicles = hopper.getGraphHopperStorage().getEncodingManager().toString().split(",");
json.put("supported_vehicles", vehicles);
JSONObject features = new JSONObject();
for (String v : vehicles)
{
JSONObject perVehicleJson = new JSONObject();
perVehicleJson.put("elevation", hopper.hasElevation());
features.put(v, perVehicleJson);
}
json.put("features", features);
json.put("version", Constants.VERSION);
json.put("build_date", Constants.BUILD_DATE);
StorableProperties props = hopper.getGraphHopperStorage().getProperties();
json.put("import_date", props.get("osmreader.import.date"));
if (!Helper.isEmpty(props.get("osmreader.data.date")))
json.put("data_date" , props.get("osmreader.data.date"));
if (!Helper.isEmpty(props.get("prepare.date")))
json.put("prepare_date", props.get("prepare.date"));
writeJson(req, res, json);
}
}