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@rponte rponte/App.java
Last active Oct 15, 2019

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Downloading file using Apache HttpClient (>= v4.2) with support to HTTP REDIRECT 301 and 302 when using HTTP method GET or POST
public class App {
public static void main(String[] args) throws MalformedURLException {
URL rightUrl = new URL("http://cursos.triadworks.com.br/assets/css/main.css");
URL redirectableUrl = new URL("http://www.triadworks.com.br/assets/css/main.css"); // redirected to cursos.triadworks.com.br
Downloader downloader = new Downloader();
System.out.println("Downloading file through right Url...");
downloader.download(rightUrl, new File("main-ok.css"));
System.out.println("Downloading file through a redirectable Url...");
downloader.download(redirectableUrl, new File("main-redirected.css"));
}
}
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.client.LaxRedirectStrategy;
public class Downloader {
public File download(URL url, File dstFile) {
CloseableHttpClient httpclient = HttpClients.custom()
.setRedirectStrategy(new LaxRedirectStrategy()) // adds HTTP REDIRECT support to GET and POST methods
.build();
try {
HttpGet get = new HttpGet(url.toURI()); // we're using GET but it could be via POST as well
File downloaded = httpclient.execute(get, new FileDownloadResponseHandler(dstFile));
return downloaded;
} catch (Exception e) {
throw new IllegalStateException(e);
} finally {
IOUtils.closeQuietly(httpclient);
}
}
static class FileDownloadResponseHandler implements ResponseHandler<File> {
private final File target;
public FileDownloadResponseHandler(File target) {
this.target = target;
}
@Override
public File handleResponse(HttpResponse response) throws ClientProtocolException, IOException {
InputStream source = response.getEntity().getContent();
FileUtils.copyInputStreamToFile(source, this.target);
return this.target;
}
}
}
@newfound-systems

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newfound-systems commented Oct 27, 2016

Perfectly works, Thanks

@anfb

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anfb commented Jan 14, 2019

Great job! 👍

@cpemaratech

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cpemaratech commented Feb 18, 2019

It helped 👍

@CheongbinKim

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CheongbinKim commented May 23, 2019

It helped +1

@teagithub

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teagithub commented Jul 13, 2019

Thank you!
Tips for others who want to use it: if use maven , pom.xml needs to add the following from https://mvnrepository.com/artifact/org.apache.directory.studio/org.apache.commons.io

@AyeshW

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AyeshW commented Oct 15, 2019

It worked perfectly. Thank you!

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