Android Open Source - One-Button-App---Android Manager Connect Direct

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Copyright (c) 2002,2003, Stefan Haustein, Oberhausen, Rhld., Germany Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (...

Java Source Code

/*
 * ====================================================================
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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
 *//from w w  w. java  2 s  .  com
 *   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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */

package org.apache.http.examples.conn;

import org.apache.http.Header;
import org.apache.http.HttpHost;
import org.apache.http.HttpRequest;
import org.apache.http.HttpResponse;
import org.apache.http.HttpVersion;
import org.apache.http.conn.ClientConnectionManager;
import org.apache.http.conn.routing.HttpRoute;
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.scheme.SchemeSocketFactory;
import org.apache.http.conn.ClientConnectionRequest;
import org.apache.http.conn.ManagedClientConnection;
import org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager;
import org.apache.http.message.BasicHttpRequest;
import org.apache.http.params.HttpParams;
import org.apache.http.params.HttpProtocolParams;
import org.apache.http.params.SyncBasicHttpParams;
import org.apache.http.protocol.HttpContext;
import org.apache.http.protocol.BasicHttpContext;

/**
 * How to open a direct connection using
 * {@link ClientConnectionManager ClientConnectionManager}.
 * This exemplifies the <i>opening</i> of the connection only.
 * The subsequent message exchange in this example should not
 * be used as a template.
 *
 * @since 4.0
 */
public class ManagerConnectDirect {

    /**
     * Main entry point to this example.
     *
     * @param args      ignored
     */
    public final static void main(String[] args) throws Exception {

        HttpHost target = new HttpHost("www.apache.org", 80, "http");

        // Register the "http" protocol scheme, it is required
        // by the default operator to look up socket factories.
        SchemeRegistry supportedSchemes = new SchemeRegistry();
        SchemeSocketFactory sf = PlainSocketFactory.getSocketFactory();
        supportedSchemes.register(new Scheme("http", 80, sf));

        // Prepare parameters.
        // Since this example doesn't use the full core framework,
        // only few parameters are actually required.
        HttpParams params = new SyncBasicHttpParams();
        HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);
        HttpProtocolParams.setUseExpectContinue(params, false);

        ClientConnectionManager clcm = new ThreadSafeClientConnManager(supportedSchemes);

        HttpRequest req = new BasicHttpRequest("OPTIONS", "*", HttpVersion.HTTP_1_1);
        req.addHeader("Host", target.getHostName());

        HttpContext ctx = new BasicHttpContext();

        System.out.println("preparing route to " + target);
        HttpRoute route = new HttpRoute
            (target, null, supportedSchemes.getScheme(target).isLayered());

        System.out.println("requesting connection for " + route);
        ClientConnectionRequest connRequest = clcm.requestConnection(route, null);
        ManagedClientConnection conn = connRequest.getConnection(0, null);
        try {
            System.out.println("opening connection");
            conn.open(route, ctx, params);

            System.out.println("sending request");
            conn.sendRequestHeader(req);
            // there is no request entity
            conn.flush();

            System.out.println("receiving response header");
            HttpResponse rsp = conn.receiveResponseHeader();

            System.out.println("----------------------------------------");
            System.out.println(rsp.getStatusLine());
            Header[] headers = rsp.getAllHeaders();
            for (int i=0; i<headers.length; i++) {
                System.out.println(headers[i]);
            }
            System.out.println("----------------------------------------");

            System.out.println("closing connection");
            conn.close();

        } finally {

            if (conn.isOpen()) {
                System.out.println("shutting down connection");
                try {
                    conn.shutdown();
                } catch (Exception ex) {
                    System.out.println("problem during shutdown");
                    ex.printStackTrace();
                }
            }

            System.out.println("releasing connection");
            clcm.releaseConnection(conn, -1, null);
        }

    }

}

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