Java tutorial
/* * Copyright (C) 2008 ZXing authors * * 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.application.food.zxing.client.android; import org.apache.http.HttpHost; import org.apache.http.HttpRequest; import org.apache.http.HttpResponse; import org.apache.http.client.HttpClient; import org.apache.http.client.ResponseHandler; import org.apache.http.client.methods.HttpUriRequest; import org.apache.http.client.params.HttpClientParams; import org.apache.http.client.protocol.ClientContext; import org.apache.http.conn.ClientConnectionManager; import org.apache.http.conn.scheme.PlainSocketFactory; import org.apache.http.conn.scheme.Scheme; import org.apache.http.conn.scheme.SchemeRegistry; import org.apache.http.conn.ssl.SSLSocketFactory; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager; import org.apache.http.params.BasicHttpParams; import org.apache.http.params.HttpConnectionParams; import org.apache.http.params.HttpParams; import org.apache.http.params.HttpProtocolParams; import org.apache.http.protocol.BasicHttpContext; import org.apache.http.protocol.HttpContext; import java.io.IOException; /** * <p>Subclass of the Apache {@link org.apache.http.impl.client.DefaultHttpClient} that is configured with * reasonable default settings and registered schemes for Android, and * also lets the user add {@link org.apache.http.HttpRequestInterceptor} classes. * Don't create this directly, use the {@link #newInstance} factory method.</p> * <p/> * <p>This client processes cookies but does not retain them by default. * To retain cookies, simply add a cookie store to the HttpContext: * <pre>context.setAttribute(ClientContext.COOKIE_STORE, cookieStore);</pre> * </p> */ public final class AndroidHttpClient implements HttpClient { /** * Create a new HttpClient with reasonable defaults (which you can update). * * @param userAgent to report in your HTTP requests. * @return AndroidHttpClient for you to use for all your requests. */ public static AndroidHttpClient newInstance(String userAgent) { HttpParams params = new BasicHttpParams(); // Turn off stale checking. Our connections break all the time anyway, // and it's not worth it to pay the penalty of checking every time. HttpConnectionParams.setStaleCheckingEnabled(params, false); // Default connection and socket timeout of 20 seconds. Tweak to taste. HttpConnectionParams.setConnectionTimeout(params, 20 * 1000); HttpConnectionParams.setSoTimeout(params, 20 * 1000); HttpConnectionParams.setSocketBufferSize(params, 8192); // Don't handle redirects -- return them to the caller. Our code // often wants to re-POST after a redirect, which we must do ourselves. HttpClientParams.setRedirecting(params, false); // Set the specified user agent and register standard protocols. if (userAgent != null) { HttpProtocolParams.setUserAgent(params, userAgent); } SchemeRegistry schemeRegistry = new SchemeRegistry(); schemeRegistry.register(new Scheme("http", PlainSocketFactory.getSocketFactory(), 80)); schemeRegistry.register(new Scheme("https", SSLSocketFactory.getSocketFactory(), 443)); ClientConnectionManager manager = new ThreadSafeClientConnManager(params, schemeRegistry); // We use a factory method to modify superclass initialization // parameters without the funny call-a-static-method dance. return new AndroidHttpClient(manager, params); } private final HttpClient delegate; private AndroidHttpClient(ClientConnectionManager ccm, HttpParams params) { this.delegate = new DelegateHttpClient(ccm, params); } /** * Release resources associated with this client. You must call this, * or significant resources (sockets and memory) may be leaked. */ public void close() { getConnectionManager().shutdown(); } public HttpParams getParams() { return delegate.getParams(); } public ClientConnectionManager getConnectionManager() { return delegate.getConnectionManager(); } public HttpResponse execute(HttpUriRequest request) throws IOException { return delegate.execute(request); } public HttpResponse execute(HttpUriRequest request, HttpContext context) throws IOException { return delegate.execute(request, context); } public HttpResponse execute(HttpHost target, HttpRequest request) throws IOException { return delegate.execute(target, request); } public HttpResponse execute(HttpHost target, HttpRequest request, HttpContext context) throws IOException { return delegate.execute(target, request, context); } public <T> T execute(HttpUriRequest request, ResponseHandler<? extends T> responseHandler) throws IOException { return delegate.execute(request, responseHandler); } public <T> T execute(HttpUriRequest request, ResponseHandler<? extends T> responseHandler, HttpContext context) throws IOException { return delegate.execute(request, responseHandler, context); } public <T> T execute(HttpHost target, HttpRequest request, ResponseHandler<? extends T> responseHandler) throws IOException { return delegate.execute(target, request, responseHandler); } public <T> T execute(HttpHost target, HttpRequest request, ResponseHandler<? extends T> responseHandler, HttpContext context) throws IOException { return delegate.execute(target, request, responseHandler, context); } private static class DelegateHttpClient extends DefaultHttpClient { private DelegateHttpClient(ClientConnectionManager ccm, HttpParams params) { super(ccm, params); } @Override protected HttpContext createHttpContext() { // Same as DefaultHttpClient.createHttpContext() minus the // cookie store. HttpContext context = new BasicHttpContext(); context.setAttribute(ClientContext.AUTHSCHEME_REGISTRY, getAuthSchemes()); context.setAttribute(ClientContext.COOKIESPEC_REGISTRY, getCookieSpecs()); context.setAttribute(ClientContext.CREDS_PROVIDER, getCredentialsProvider()); return context; } } }