Java tutorial
/******************************************************************************* * Copyright 2011 See AUTHORS file. * * Licensed 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.badlogic.gdx.backends.gwt; import java.io.InputStream; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.Set; import com.badlogic.gdx.Net; import com.badlogic.gdx.Net.Protocol; import com.badlogic.gdx.net.HttpStatus; import com.badlogic.gdx.net.NetJavaServerSocketImpl; import com.badlogic.gdx.net.ServerSocket; import com.badlogic.gdx.net.ServerSocketHints; import com.badlogic.gdx.net.Socket; import com.badlogic.gdx.net.SocketHints; import com.badlogic.gdx.utils.GdxRuntimeException; import com.badlogic.gdx.utils.ObjectMap; import com.google.gwt.http.client.Header; import com.google.gwt.http.client.Request; import com.google.gwt.http.client.RequestBuilder; import com.google.gwt.http.client.RequestCallback; import com.google.gwt.http.client.RequestException; import com.google.gwt.http.client.Response; import com.google.gwt.user.client.Window; public class GwtNet implements Net { ObjectMap<HttpRequest, Request> requests; ObjectMap<HttpRequest, HttpResponseListener> listeners; private final class HttpClientResponse implements HttpResponse { private Response response; private HttpStatus status; public HttpClientResponse(Response response) { this.response = response; this.status = new HttpStatus(response.getStatusCode()); } @Override public byte[] getResult() { return null; } @Override public String getResultAsString() { return response.getText(); } @Override public InputStream getResultAsStream() { return null; } @Override public HttpStatus getStatus() { return status; } @Override public Map<String, List<String>> getHeaders() { Map<String, List<String>> headers = new HashMap<String, List<String>>(); Header[] responseHeaders = response.getHeaders(); for (int i = 0; i < responseHeaders.length; i++) { Header header = responseHeaders[i]; if (header != null) { String headerName = responseHeaders[i].getName(); List<String> headerValues = headers.get(headerName); if (headerValues == null) { headerValues = new ArrayList<String>(); headers.put(headerName, headerValues); } headerValues.add(responseHeaders[i].getValue()); } } return headers; } @Override public String getHeader(String name) { return response.getHeader(name); } } public GwtNet() { requests = new ObjectMap<HttpRequest, Request>(); listeners = new ObjectMap<HttpRequest, HttpResponseListener>(); } @Override public void sendHttpRequest(final HttpRequest httpRequest, final HttpResponseListener httpResultListener) { if (httpRequest.getUrl() == null) { httpResultListener.failed(new GdxRuntimeException("can't process a HTTP request without URL set")); return; } final String method = httpRequest.getMethod(); final String value = httpRequest.getContent(); final boolean valueInBody = method.equalsIgnoreCase(HttpMethods.POST) || method.equals(HttpMethods.PUT); RequestBuilder builder; String url = httpRequest.getUrl(); if (method.equalsIgnoreCase(HttpMethods.GET)) { if (value != null) { url += "?" + value; } builder = new RequestBuilder(RequestBuilder.GET, url); } else if (method.equalsIgnoreCase(HttpMethods.POST)) { builder = new RequestBuilder(RequestBuilder.POST, url); } else if (method.equalsIgnoreCase(HttpMethods.DELETE)) { if (value != null) { url += "?" + value; } builder = new RequestBuilder(RequestBuilder.DELETE, url); } else if (method.equalsIgnoreCase(HttpMethods.PUT)) { builder = new RequestBuilder(RequestBuilder.PUT, url); } else { throw new GdxRuntimeException("Unsupported HTTP Method"); } Map<String, String> content = httpRequest.getHeaders(); Set<String> keySet = content.keySet(); for (String name : keySet) { builder.setHeader(name, content.get(name)); } builder.setTimeoutMillis(httpRequest.getTimeOut()); builder.setIncludeCredentials(httpRequest.getIncludeCredentials()); try { Request request = builder.sendRequest(valueInBody ? value : null, new RequestCallback() { @Override public void onResponseReceived(Request request, Response response) { httpResultListener.handleHttpResponse(new HttpClientResponse(response)); requests.remove(httpRequest); listeners.remove(httpRequest); } @Override public void onError(Request request, Throwable exception) { httpResultListener.failed(exception); requests.remove(httpRequest); listeners.remove(httpRequest); } }); requests.put(httpRequest, request); listeners.put(httpRequest, httpResultListener); } catch (Throwable e) { httpResultListener.failed(e); } } @Override public void cancelHttpRequest(HttpRequest httpRequest) { HttpResponseListener httpResponseListener = listeners.get(httpRequest); Request request = requests.get(httpRequest); if (httpResponseListener != null && request != null) { request.cancel(); httpResponseListener.cancelled(); requests.remove(httpRequest); listeners.remove(httpRequest); } } @Override public ServerSocket newServerSocket(Protocol protocol, String hostname, int port, ServerSocketHints hints) { throw new UnsupportedOperationException("Not implemented"); } @Override public ServerSocket newServerSocket(Protocol protocol, int port, ServerSocketHints hints) { throw new UnsupportedOperationException("Not implemented"); } @Override public Socket newClientSocket(Protocol protocol, String host, int port, SocketHints hints) { throw new UnsupportedOperationException("Not implemented"); } @Override public boolean openURI(String URI) { Window.open(URI, "_blank", null); return true; } }