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 fm.smart.r1; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.net.URI; import java.net.UnknownHostException; import java.util.zip.GZIPInputStream; import java.util.zip.GZIPOutputStream; import org.apache.http.Header; import org.apache.http.HttpEntity; import org.apache.http.HttpEntityEnclosingRequest; import org.apache.http.HttpException; import org.apache.http.HttpHost; import org.apache.http.HttpMessage; import org.apache.http.HttpRequest; import org.apache.http.HttpRequestInterceptor; 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.entity.AbstractHttpEntity; import org.apache.http.entity.ByteArrayEntity; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.impl.client.RequestWrapper; 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.BasicHttpProcessor; import org.apache.http.protocol.HttpContext; import android.util.Log; /** * <p>Subclass of the Apache {@link DefaultHttpClient} that is configured with * reasonable default settings and registered schemes for Android, and * also lets the user add {@link 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 { // Gzip of data shorter than this probably won't be worthwhile public static final long DEFAULT_SYNC_MIN_GZIP_BYTES = 256; private static final String TAG = "AndroidHttpClient"; /** * Set if HTTP requests are blocked from being executed on this thread */ private static final ThreadLocal<Boolean> sThreadBlocked = new ThreadLocal<Boolean>(); /** * Interceptor throws an exception if the executing thread is blocked */ private static final HttpRequestInterceptor sThreadCheckInterceptor = new HttpRequestInterceptor() { public void process(HttpRequest request, HttpContext context) { if (sThreadBlocked.get() != null && sThreadBlocked.get()) { throw new RuntimeException("This thread forbids HTTP requests"); } } }; /** * 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. 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 RuntimeException mLeakedException = new IllegalStateException( "AndroidHttpClient created and never closed"); private AndroidHttpClient(ClientConnectionManager ccm, HttpParams params) { this.delegate = new DefaultHttpClient(ccm, params) { @Override protected BasicHttpProcessor createHttpProcessor() { // Add interceptor to prevent making requests from main thread. BasicHttpProcessor processor = super.createHttpProcessor(); processor.addRequestInterceptor(sThreadCheckInterceptor); processor.addRequestInterceptor(new CurlLogger()); return processor; } @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; } }; } @Override protected void finalize() throws Throwable { super.finalize(); if (mLeakedException != null) { Log.e(TAG, "Leak found", mLeakedException); mLeakedException = null; } } /** * Block this thread from executing HTTP requests. * Used to guard against HTTP requests blocking the main application thread. * * @param blocked if HTTP requests run on this thread should be denied */ public static void setThreadBlocked(boolean blocked) { sThreadBlocked.set(blocked); } /** * Modifies a request to indicate to the server that we would like a * gzipped response. (Uses the "Accept-Encoding" HTTP header.) * * @param request the request to modify * @see #getUngzippedContent */ public static void modifyRequestToAcceptGzipResponse(HttpMessage request) { request.addHeader("Accept-Encoding", "gzip"); } /** * Gets the input stream from a response entity. If the entity is gzipped * then this will get a stream over the uncompressed data. * * @param entity the entity whose content should be read * @return the input stream to read from * @throws IOException */ public static InputStream getUngzippedContent(HttpEntity entity) throws IOException { InputStream responseStream = entity.getContent(); if (responseStream == null) { return responseStream; } Header header = entity.getContentEncoding(); if (header == null) { return responseStream; } String contentEncoding = header.getValue(); if (contentEncoding == null) { return responseStream; } if (contentEncoding.contains("gzip")) responseStream = new GZIPInputStream(responseStream); return responseStream; } /** * Release resources associated with this client. You must call this, * or significant resources (sockets and memory) may be leaked. */ public void close() { if (mLeakedException != null) { getConnectionManager().shutdown(); mLeakedException = null; } } public HttpParams getParams() { return delegate.getParams(); } public ClientConnectionManager getConnectionManager() { return delegate.getConnectionManager(); } public HttpResponse execute(HttpUriRequest request) throws IOException, UnknownHostException { return delegate.execute(request); } public HttpResponse execute(HttpUriRequest request, HttpContext context) throws IOException, UnknownHostException { return delegate.execute(request, context); } public HttpResponse execute(HttpHost target, HttpRequest request) throws IOException, UnknownHostException { return delegate.execute(target, request); } public HttpResponse execute(HttpHost target, HttpRequest request, HttpContext context) throws IOException, UnknownHostException { return delegate.execute(target, request, context); } public <T> T execute(HttpUriRequest request, ResponseHandler<? extends T> responseHandler) throws IOException, UnknownHostException { return delegate.execute(request, responseHandler); } public <T> T execute(HttpUriRequest request, ResponseHandler<? extends T> responseHandler, HttpContext context) throws IOException, UnknownHostException { return delegate.execute(request, responseHandler, context); } public <T> T execute(HttpHost target, HttpRequest request, ResponseHandler<? extends T> responseHandler) throws IOException, UnknownHostException { return delegate.execute(target, request, responseHandler); } public <T> T execute(HttpHost target, HttpRequest request, ResponseHandler<? extends T> responseHandler, HttpContext context) throws IOException, UnknownHostException { return delegate.execute(target, request, responseHandler, context); } /** * Compress data to send to server. * Creates a Http Entity holding the gzipped data. * The data will not be compressed if it is too short. * * @param data The bytes to compress * @return Entity holding the data */ public static AbstractHttpEntity getCompressedEntity(byte data[]) throws IOException { AbstractHttpEntity entity; if (data.length < getMinGzipSize()) { entity = new ByteArrayEntity(data); } else { ByteArrayOutputStream arr = new ByteArrayOutputStream(); OutputStream zipper = new GZIPOutputStream(arr); zipper.write(data); zipper.close(); entity = new ByteArrayEntity(arr.toByteArray()); entity.setContentEncoding("gzip"); } return entity; } /** * Retrieves the minimum size for compressing data. * Shorter data will not be compressed. */ public static long getMinGzipSize() { return DEFAULT_SYNC_MIN_GZIP_BYTES; } /* cURL logging support. */ /** * Logging tag and level. */ private static class LoggingConfiguration { private final String tag; private final int level; private LoggingConfiguration(String tag, int level) { this.tag = tag; this.level = level; } /** * Returns true if logging is turned on for this configuration. */ private boolean isLoggable() { return Log.isLoggable(tag, level); } /** * Prints a message using this configuration. */ private void println(String message) { Log.println(level, tag, message); } } /** * cURL logging configuration. */ private volatile LoggingConfiguration curlConfiguration; /** * Enables cURL request logging for this client. * * @param name to log messages with * @param level at which to log messages (see {@link android.util.Log}) */ public void enableCurlLogging(String name, int level) { if (name == null) { throw new NullPointerException("name"); } if (level < Log.VERBOSE || level > Log.ASSERT) { throw new IllegalArgumentException("Level is out of range [" + Log.VERBOSE + ".." + Log.ASSERT + "]"); } curlConfiguration = new LoggingConfiguration(name, level); } /** * Disables cURL logging for this client. */ public void disableCurlLogging() { curlConfiguration = null; } /** * Logs cURL commands equivalent to requests. */ private class CurlLogger implements HttpRequestInterceptor { public void process(HttpRequest request, HttpContext context) throws HttpException, IOException { LoggingConfiguration configuration = curlConfiguration; if (configuration != null && configuration.isLoggable() && request instanceof HttpUriRequest) { configuration.println(toCurl((HttpUriRequest) request)); } } /** * Generates a cURL command equivalent to the given request. */ private String toCurl(HttpUriRequest request) throws IOException { StringBuilder builder = new StringBuilder(); builder.append("curl "); for (Header header : request.getAllHeaders()) { builder.append("--header \""); builder.append(header.toString().trim()); builder.append("\" "); } URI uri = request.getURI(); // If this is a wrapped request, use the URI from the original // request instead. getURI() on the wrapper seems to return a // relative URI. We want an absolute URI. if (request instanceof RequestWrapper) { HttpRequest original = ((RequestWrapper) request).getOriginal(); if (original instanceof HttpUriRequest) { uri = ((HttpUriRequest) original).getURI(); } } builder.append('"'); builder.append(uri); builder.append('"'); if (request instanceof HttpEntityEnclosingRequest) { HttpEntityEnclosingRequest entityRequest = (HttpEntityEnclosingRequest) request; HttpEntity entity = entityRequest.getEntity(); if (entity != null && entity.isRepeatable()) { if (entity.getContentLength() < 1024) { ByteArrayOutputStream stream = new ByteArrayOutputStream(); entity.writeTo(stream); String entityString = stream.toString(); // TODO: Check the content type, too. builder.append(" --data-ascii \"").append(entityString).append('"'); } else { builder.append(" [TOO MUCH DATA TO INCLUDE]"); } } } return builder.toString(); } } }