Java tutorial
/* * Copyright (C) 2011 The Android Open Source Project * * 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.kubeiwu.commontool.khttp.toolbox; import java.io.DataOutputStream; import java.io.IOException; import java.io.InputStream; import java.net.HttpURLConnection; import java.net.URL; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.Map.Entry; import javax.net.ssl.HttpsURLConnection; import javax.net.ssl.SSLSocketFactory; import org.apache.http.Header; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.ProtocolVersion; import org.apache.http.StatusLine; import org.apache.http.entity.BasicHttpEntity; import org.apache.http.message.BasicHeader; import org.apache.http.message.BasicHttpResponse; import org.apache.http.message.BasicStatusLine; import com.kubeiwu.commontool.khttp.Request; import com.kubeiwu.commontool.khttp.Request.Method; import com.kubeiwu.commontool.khttp.exception.AuthFailureError; /** * An {@link HttpStack} based on {@link HttpURLConnection}. */ public class HurlStack implements HttpStack { private static final String HEADER_CONTENT_TYPE = "Content-Type"; /** * An interface for transforming URLs before use. */ public interface UrlRewriter { /** * Returns a URL to use instead of the provided one, or null to indicate this URL should not be used at all. */ public String rewriteUrl(String originalUrl); } private final UrlRewriter mUrlRewriter; private final SSLSocketFactory mSslSocketFactory; public HurlStack() { this(null); } /** * @param urlRewriter * Rewriter to use for request URLs */ public HurlStack(UrlRewriter urlRewriter) { this(urlRewriter, null); } /** * @param urlRewriter * Rewriter to use for request URLs * @param sslSocketFactory * SSL factory to use for HTTPS connections */ public HurlStack(UrlRewriter urlRewriter, SSLSocketFactory sslSocketFactory) { mUrlRewriter = urlRewriter; mSslSocketFactory = sslSocketFactory; } @Override public HttpResponse performRequest(Request<?> request, Map<String, String> additionalHeaders) throws IOException, AuthFailureError { String url = request.getUrl(); HashMap<String, String> map = new HashMap<String, String>(); map.putAll(request.getHeaders());// map.putAll(additionalHeaders); if (mUrlRewriter != null) { String rewritten = mUrlRewriter.rewriteUrl(url);// ?url if (rewritten == null) { throw new IOException("URL blocked by rewriter: " + url); } url = rewritten; } URL parsedUrl = new URL(url); HttpURLConnection connection = openConnection(parsedUrl, request); for (String headerName : map.keySet()) {// header connection.addRequestProperty(headerName, map.get(headerName)); } setConnectionParametersForRequest(connection, request); // Initialize HttpResponse with data from the HttpURLConnection. ProtocolVersion protocolVersion = new ProtocolVersion("HTTP", 1, 1); int responseCode = connection.getResponseCode(); if (responseCode == -1) { // -1 is returned by getResponseCode() if the response code could // not be retrieved. // Signal to the caller that something was wrong with the // connection. throw new IOException("Could not retrieve response code from HttpUrlConnection."); } StatusLine responseStatus = new BasicStatusLine(protocolVersion, connection.getResponseCode(), connection.getResponseMessage()); BasicHttpResponse response = new BasicHttpResponse(responseStatus); response.setEntity(entityFromConnection(connection)); for (Entry<String, List<String>> header : connection.getHeaderFields().entrySet()) { if (header.getKey() != null) { // Header h = new BasicHeader(header.getKey(), header.getValue().get(0)); // response.addHeader(h); //cookie? String key = header.getKey(); List<String> values = header.getValue(); if (key.equalsIgnoreCase("set-cookie")) { StringBuilder cookieString = new StringBuilder(); for (String value : values) { cookieString.append(value).append("\n");// \ncookie?? } cookieString.deleteCharAt(cookieString.length() - 1); Header h = new BasicHeader(header.getKey(), cookieString.toString()); response.addHeader(h); } else { Header h = new BasicHeader(header.getKey(), values.get(0)); response.addHeader(h); } } } System.out.println("performRequest---999999-getStatusLine=" + response.getStatusLine()); return response; } /** * Initializes an {@link HttpEntity} from the given {@link HttpURLConnection}. * * @param connection * @return an HttpEntity populated with data from <code>connection</code>. */ private static HttpEntity entityFromConnection(HttpURLConnection connection) { BasicHttpEntity entity = new BasicHttpEntity(); InputStream inputStream; try { inputStream = connection.getInputStream(); } catch (IOException ioe) { inputStream = connection.getErrorStream(); } entity.setContent(inputStream); entity.setContentLength(connection.getContentLength()); entity.setContentEncoding(connection.getContentEncoding()); entity.setContentType(connection.getContentType()); return entity; } /** * Create an {@link HttpURLConnection} for the specified {@code url}. */ protected HttpURLConnection createConnection(URL url) throws IOException { return (HttpURLConnection) url.openConnection(); } /** * Opens an {@link HttpURLConnection} with parameters. * * @param url * @return an open connection * @throws IOException */ private HttpURLConnection openConnection(URL url, Request<?> request) throws IOException { HttpURLConnection connection = createConnection(url); int timeoutMs = request.getTimeoutMs(); connection.setConnectTimeout(timeoutMs); connection.setReadTimeout(timeoutMs); connection.setUseCaches(false); connection.setDoInput(true); // use caller-provided custom SslSocketFactory, if any, for HTTPS if ("https".equals(url.getProtocol()) && mSslSocketFactory != null) { ((HttpsURLConnection) connection).setSSLSocketFactory(mSslSocketFactory); } return connection; } /* package */ static void setConnectionParametersForRequest(HttpURLConnection connection, Request<?> request) throws IOException, AuthFailureError { switch (request.getMethod()) { case Method.DEPRECATED_GET_OR_POST: // This is the deprecated way that needs to be handled for backwards // compatibility. // If the request's post body is null, then the assumption is that // the request is // GET. Otherwise, it is assumed that the request is a POST. byte[] postBody = request.getBody(); if (postBody != null) { // Prepare output. There is no need to set Content-Length // explicitly, // since this is handled by HttpURLConnection using the size of // the prepared // output stream. connection.setDoOutput(true); connection.setRequestMethod("POST"); connection.addRequestProperty(HEADER_CONTENT_TYPE, request.getBodyContentType()); DataOutputStream out = new DataOutputStream(connection.getOutputStream()); out.write(postBody); out.close(); } break; case Method.GET: // Not necessary to set the request method because connection // defaults to GET but // being explicit here. connection.setRequestMethod("GET"); break; case Method.DELETE: connection.setRequestMethod("DELETE"); break; case Method.POST: connection.setRequestMethod("POST"); addBodyIfExists(connection, request); break; case Method.PUT: connection.setRequestMethod("PUT"); addBodyIfExists(connection, request); break; default: throw new IllegalStateException("Unknown method type."); } } private static void addBodyIfExists(HttpURLConnection connection, Request<?> request) throws IOException, AuthFailureError { byte[] body = request.getBody(); if (body != null) { connection.setDoOutput(true); connection.addRequestProperty(HEADER_CONTENT_TYPE, request.getBodyContentType()); DataOutputStream out = new DataOutputStream(connection.getOutputStream()); out.write(body); out.close(); } } }