de.blizzy.documentr.system.Downloader.java Source code

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Here is the source code for de.blizzy.documentr.system.Downloader.java

Source

/*
documentr - Edit, maintain, and present software documentation on the web.
Copyright (C) 2012-2013 Maik Schreiber
    
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 3 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 de.blizzy.documentr.system;

import java.io.IOException;
import java.net.URI;
import java.nio.charset.Charset;
import java.util.concurrent.TimeUnit;

import org.apache.commons.io.IOUtils;
import org.springframework.http.HttpMethod;
import org.springframework.http.HttpStatus;
import org.springframework.http.HttpStatus.Series;
import org.springframework.http.client.ClientHttpRequest;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.http.client.SimpleClientHttpRequestFactory;

class Downloader {
    private static final long TIMEOUT = TimeUnit.MILLISECONDS.convert(10, TimeUnit.SECONDS);

    String getTextFromUrl(String url, Charset encoding) throws IOException {
        ClientHttpResponse response = null;
        try {
            SimpleClientHttpRequestFactory requestFactory = new SimpleClientHttpRequestFactory();
            requestFactory.setConnectTimeout((int) TIMEOUT);
            requestFactory.setReadTimeout((int) TIMEOUT);
            ClientHttpRequest request = requestFactory.createRequest(URI.create(url), HttpMethod.GET);
            response = request.execute();
            HttpStatus status = response.getStatusCode();
            if (status.series() == Series.SUCCESSFUL) {
                return IOUtils.toString(response.getBody(), encoding);
            }
        } finally {
            if (response != null) {
                response.close();
            }
        }
        return null;
    }
}