Java tutorial
/* * geo-platform * Rich webgis framework * http://geo-platform.org * ==================================================================== * * Copyright (C) 2008-2012 geoSDI Group (CNR IMAA - Potenza - ITALY). * * This program is free software: you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. This program is distributed in the * hope that it will be useful, but WITHOUT ANY WARRANTY; without * even the implied warranty of MERCHANTABILITY or FITNESS FOR * A PARTICULAR PURPOSE. See the GNU General Public License * for more details. You should have received a copy of the GNU General * Public License along with this program. If not, see http://www.gnu.org/licenses/ * * ==================================================================== * * Linking this library statically or dynamically with other modules is * making a combined work based on this library. Thus, the terms and * conditions of the GNU General Public License cover the whole combination. * * As a special exception, the copyright holders of this library give you permission * to link this library with independent modules to produce an executable, regardless * of the license terms of these independent modules, and to copy and distribute * the resulting executable under terms of your choice, provided that you also meet, * for each linked independent module, the terms and conditions of the license of * that module. An independent module is a module which is not derived from or * based on this library. If you modify this library, you may extend this exception * to your version of the library, but you are not obligated to do so. If you do not * wish to do so, delete this exception statement from your version. * */ package org.geosdi.geoplatform.connector.server.request; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.Reader; import java.io.StringWriter; import java.io.UnsupportedEncodingException; import java.io.Writer; import javax.xml.bind.JAXBElement; import javax.xml.bind.JAXBException; import javax.xml.bind.Unmarshaller; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.client.ClientProtocolException; import org.apache.http.client.methods.HttpPost; import org.apache.http.util.EntityUtils; import org.geosdi.geoplatform.connector.server.GPServerConnector; import org.geosdi.geoplatform.exception.IllegalParameterFault; import org.geosdi.geoplatform.exception.ServerInternalFault; /** * * @author Giuseppe La Scaleia - CNR IMAA geoSDI Group * @email giuseppe.lascaleia@geosdi.org * @author Vincenzo Monteverde <vincenzo.monteverde@geosdi.org> */ public abstract class GPPostConnectorRequest<T> extends GPAbstractConnectorRequest<T> { private HttpPost postMethod; public GPPostConnectorRequest(GPServerConnector server) { super(server); } public HttpPost getPostMethod() throws IllegalParameterFault, JAXBException, ServerInternalFault { if (postMethod == null) { this.preparePostMethod(); } return postMethod; } private void preparePostMethod() throws IllegalParameterFault, JAXBException, ServerInternalFault { super.prepareHttpParams(); this.postMethod = new HttpPost(super.serverURI); try { this.postMethod.setEntity(this.preparePostEntity()); } catch (UnsupportedEncodingException ex) { logger.error("\n@@@@@@@@@@@@@@@@@@ UnsupportedEncodingException *** {} ***", ex.getMessage()); throw new ServerInternalFault("*** UnsupportedEncodingException ***"); } } @Override public T getResponse() throws IllegalParameterFault, ServerInternalFault, IOException { T response = null; try { HttpResponse httpResponse = super.securityConnector.secure(this, this.getPostMethod()); HttpEntity responseEntity = httpResponse.getEntity(); if (responseEntity != null) { InputStream is = responseEntity.getContent(); Unmarshaller unmarshaller = getUnmarshaller(); Object content = unmarshaller.unmarshal(is); if (!(content instanceof JAXBElement)) { // ExceptionReport logger.error("\n#############\n{}\n#############", content); throw new ServerInternalFault("Connector Server Error: incorrect responce"); } JAXBElement<T> elementType = (JAXBElement<T>) content; response = elementType.getValue(); EntityUtils.consume(responseEntity); } else { throw new ServerInternalFault("Connector Server Error: Connection " + "problem"); } } catch (JAXBException ex) { logger.error("\n@@@@@@@@@@@@@@@@@@ JAXBException *** {} ***", ex.getMessage()); throw new ServerInternalFault("*** JAXBException ***" + ex); } catch (ClientProtocolException ex) { logger.error("\n@@@@@@@@@@@@@@@@@@ ClientProtocolException *** {} ***", ex.getMessage()); throw new ServerInternalFault("*** ClientProtocolException ***"); } return response; } @Override public String getResponseAsString() throws ServerInternalFault, IOException, IllegalParameterFault { Writer writer = new StringWriter(); try { HttpResponse httpResponse = super.securityConnector.secure(this, this.getPostMethod()); HttpEntity responseEntity = httpResponse.getEntity(); if (responseEntity != null) { InputStream is = responseEntity.getContent(); char[] buffer = new char[1024]; Reader reader = new BufferedReader(new InputStreamReader(is, "UTF-8")); int n; while ((n = reader.read(buffer)) != -1) { writer.write(buffer, 0, n); } EntityUtils.consume(responseEntity); } else { throw new ServerInternalFault("Connector Server Error: Connection " + "problem"); } } catch (JAXBException ex) { logger.error("\n@@@@@@@@@@@@@@@@@@ JAXBException *** {} ***", ex.getMessage()); throw new ServerInternalFault("*** JAXBException ***"); } catch (ClientProtocolException ex) { logger.error("\n@@@@@@@@@@@@@@@@@@ ClientProtocolException *** {} ***", ex.getMessage()); throw new ServerInternalFault("*** ClientProtocolException ***"); } return writer.toString(); } @Override public InputStream getResponseAsStream() throws ServerInternalFault, IOException, IllegalParameterFault { try { HttpResponse httpResponse = super.securityConnector.secure(this, this.getPostMethod()); HttpEntity responseEntity = httpResponse.getEntity(); if (responseEntity != null) { return responseEntity.getContent(); } else { throw new ServerInternalFault("Connector Server Error: Connection " + "problem"); } } catch (JAXBException ex) { logger.error("\n@@@@@@@@@@@@@@@@@@ JAXBException *** {} ***", ex.getMessage()); throw new ServerInternalFault("*** JAXBException ***" + ex); } catch (ClientProtocolException ex) { logger.error("\n@@@@@@@@@@@@@@@@@@ ClientProtocolException *** {} ***", ex.getMessage()); throw new ServerInternalFault("*** ClientProtocolException ***"); } } protected abstract HttpEntity preparePostEntity() throws IllegalParameterFault, JAXBException, UnsupportedEncodingException; }