org.silvertunnel_ng.demo.download_tool.HttpServiceImpl.java Source code

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Here is the source code for org.silvertunnel_ng.demo.download_tool.HttpServiceImpl.java

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/*
 * silvertunnel.org Demo - Java example applications accessing anonymity networks
 * Copyright (c) 2009-2012 silvertunnel.org
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, see <http://www.gnu.org/licenses/>.
 */
package org.silvertunnel_ng.demo.download_tool;

import java.util.logging.Level;
import java.util.logging.Logger;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpVersion;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
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.scheme.SocketFactory;
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.HttpParams;
import org.apache.http.params.HttpProtocolParams;
import org.apache.http.protocol.HttpService;
import org.apache.http.util.EntityUtils;

/**
 * 
 * @author hapke
 */
public class HttpServiceImpl {
    private static final Logger logger = Logger.getLogger(HttpServiceImpl.class.getName());

    private static final String USER_AGENT = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)";

    /**
     * use the same HTTPClient for multiple requests to one site to allow cookie
     * handling
     */
    private HttpClient httpClient;

    private SchemeRegistry schemeRegistry;

    public HttpServiceImpl() {
        try {
            // Register the "http" protocol scheme, it is required
            // by the default operator to look up socket factories.
            schemeRegistry = new SchemeRegistry();
            SocketFactory sf = PlainSocketFactory.getSocketFactory();
            final int PORT_80 = 80;
            schemeRegistry.register(new Scheme("http", sf, PORT_80));

            initHttpClient();

        } catch (Throwable t) {
            logger.log(Level.SEVERE, "Cannot init HttpServiceImpl", t);
        }
    }

    /**
     * @see HttpService#initHttpClient()
     */
    public void initHttpClient() {
        try {
            // prepare parameters
            HttpParams params = new BasicHttpParams();
            HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);
            HttpProtocolParams.setContentCharset(params, "UTF-8");

            // create http client
            ClientConnectionManager ccm = new ThreadSafeClientConnManager(params, schemeRegistry);
            httpClient = new DefaultHttpClient(ccm, params);

            // user agent settings
            if (USER_AGENT != null) {
                HttpProtocolParams.setUserAgent(httpClient.getParams(), USER_AGENT);
            }

        } catch (Throwable t) {
            logger.log(Level.WARNING, "initHttpClient()", t);
        }
    }

    /**
     * @see HttpService#getFromURL(String)
     */
    public String getFromURL(String url) {
        try {
            // the request URL
            // final HttpHost requestedHost = new HttpHost("google.de", 80,
            // "http");
            // HttpRequest request = new BasicHttpRequest("GET", "/",
            // HttpVersion.HTTP_1_1);

            // send request and receive response
            HttpGet httpGet = new HttpGet(url);
            HttpResponse response = httpClient.execute(httpGet);

            // read the response
            HttpEntity responseEntity = response.getEntity();
            String result = EntityUtils.toString(responseEntity);

            /*
             * Header[] headers = httpGet.getAllHeaders(); for (Header h:
             * headers) { if (h.getName().toLowerCase().contains("cookie")) {
             * logger.info("    Request header:"+h.toString()); } } headers =
             * response.getAllHeaders(); for (Header h: headers) { if
             * (h.getName().toLowerCase().contains("cookie")) {
             * logger.info("    Response header:"+h.toString()); } }
             */

            return result;
        } catch (Throwable t) {
            logger.log(Level.WARNING, "Cannot load url=" + url, t);
            return null;
        }
    }
}