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Downloading a zip-file with URLConnection

Posted on 2008-09-30
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Last Modified: 2008-11-07
Hi, I'm trying to download a zip-file with an URLConnection. But inputStream.read(buffer)) returns always -1.If I use another address to a normal html-page, it works. See my code below.
Can anyone help?
Thanks
...

            URL url = new URL(address);

            outputStream = new BufferedOutputStream(new FileOutputStream(localFileName));

            URLConnection urlConnection = url.openConnection();

            

            inputStream = urlConnection.getInputStream();

            byte[] buffer = new byte[1024];

            int numRead;

            long numWritten = 0;

            while ((numRead = inputStream.read(buffer)) != -1)

            {

                outputStream.write(buffer, 0, numRead);

                numWritten += numRead;

            }

...

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Question by:bueschi
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Expert Comment

by:Ajay-Singh
ID: 22606267
Are you able to download the zip page from browser? and from tools like wget, curl?
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Author Comment

by:bueschi
ID: 22606472
Hi Ajay-Singh, thank you for your question. For sure, with the browser, its no problem for downloading the file.I have not installed a tool like wget or curl.
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LVL 23

Expert Comment

by:Ajay-Singh
ID: 22611379
Can you set the request property to use browser's user-agent,

urlConnection.setRequestProperty("User-Agent", "Mozilla/4.0");
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Author Comment

by:bueschi
ID: 22681977
Hi Ajay-Singh, sorry, that I havent answer your question. We have new firewall sittings in our company, I tried it over vpn and we are going to solve the dowload with mule. So my problem is obsolete. Sorry and thanks
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Accepted Solution

by:
bueschi earned 0 total points
ID: 22864933
Finally I found a solution with the help of jakarta commons http client:
public String downloadFile(final String uri,

                           final String localFilePath,

                           final LogInformation logInformation)

{

    HttpClient client = new HttpClient();

    HostConfiguration config = new HostConfiguration();

    config.setProxy(PROXY_ADDRESS, PROXY_PORT);

    Credentials defaultcreds = new UsernamePasswordCredentials(PROXY_USER, PROXY_PASSWORD);

    client.getState().setProxyCredentials(AuthScope.ANY, defaultcreds);

    client.setHostConfiguration(config);
 

    List<String> authPrefs = new ArrayList<String>(1);

    authPrefs.add(AuthPolicy.BASIC);

    // This will exclude the NTLM authentication scheme

    client.getParams().setParameter(AuthPolicy.AUTH_SCHEME_PRIORITY, authPrefs);
 

    GetMethod method = new GetMethod(uri);

    OutputStream outputStream = null;

    String fileNameWithPath = null;

    // Provide custom retry handler is necessary

    method.getParams().setParameter(HttpMethodParams.RETRY_HANDLER,

                                    new DefaultHttpMethodRetryHandler(3, false));
 

    InputStream responseBody = null;

    try

    {

        int statusCode = client.executeMethod(method);

        if (statusCode != HttpStatus.SC_OK)

        {

            log.error(logInformation, "Method failed: " + method.getStatusLine());

        }

        responseBody = method.getResponseBodyAsStream();

        fileNameWithPath = localFilePath + extractFileName(method.getPath());

        outputStream = new BufferedOutputStream(new FileOutputStream(fileNameWithPath));

        log.info(logInformation, "write the file: '" + fileNameWithPath + "'.");

        IOUtils.copy(responseBody, outputStream);

        outputStream.close();

        responseBody.close();

    }

    catch (HttpException e)

    {

        String message = "A HttpException on downloading the shab archive: " + e.getMessage();

        log.error(logInformation, message, e);

        throw new RuntimeException(message);

    }

    catch (IOException e)

    {

        String message = "A IOException on downloading the shab archive: " + e.getMessage();

        log.error(logInformation, message, e);

        throw new RuntimeException(message);

    }

    finally

    {

        // Release the connection.

        method.releaseConnection();

    }

    return fileNameWithPath;

}
 
 

/**

 * Extracts the file name.

 *

 * @param path the path containing the name of the file.

 * @return the name of the file.

 */

private String extractFileName(String path)

{

    String[] splits = path.split("/");

    String filename = splits[splits.length - 1];

    return filename;

}

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