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IronJacamar is an implementation of the Java EE Connector Architecture 1.7 specification
There is a newer version: 3.0.10.Final
/*
 * IronJacamar, a Java EE Connector Architecture implementation
 * Copyright 2011, Red Hat Inc, and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.jboss.jca.as.upgrader;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;

/**
 * Support the http:// protocol
 */
public class Http
{
   /**
    * Constructor
    */
   public Http()
   {
   }

   /**
    * {@inheritDoc}
    */
   public boolean download(String path, File target)
   {
      boolean redirect = HttpURLConnection.getFollowRedirects();
      HttpURLConnection.setFollowRedirects(true);

      InputStream is = null;
      OutputStream os = null;
      try
      {
         URL u = new URL(path);
         URLConnection connection = u.openConnection();

         connection.connect();

         is = new BufferedInputStream(connection.getInputStream(), 8192);
         os = new BufferedOutputStream(new FileOutputStream(target), 8192);

         int b;
         while ((b = is.read()) != -1)
         {
            os.write(b);
         }

         os.flush();

         return true;
      }
      catch (Throwable t)
      {
         // Nothing to do
      }
      finally
      {
         if (is != null)
         {
            try
            {
               is.close();
            }
            catch (IOException ignore)
            {
               // Ignore
            }
         }
         if (os != null)
         {
            try
            {
               os.close();
            }
            catch (IOException ignore)
            {
               // Ignore
            }
         }

         HttpURLConnection.setFollowRedirects(redirect);
      }

      return false;
   }

   /**
    * {@inheritDoc}
    */
   public String get(String path)
   {
      boolean redirect = HttpURLConnection.getFollowRedirects();
      HttpURLConnection.setFollowRedirects(true);

      InputStream is = null;
      ByteArrayOutputStream os = new ByteArrayOutputStream();
      try
      {
         URL u = new URL(path);
         URLConnection connection = u.openConnection();

         connection.connect();

         is = new BufferedInputStream(connection.getInputStream(), 8192);

         int b;
         while ((b = is.read()) != -1)
         {
            os.write(b);
         }

         os.flush();

         return new String(os.toByteArray(), "UTF-8");
      }
      catch (Throwable t)
      {
         // Nothing to do
      }
      finally
      {
         if (is != null)
         {
            try
            {
               is.close();
            }
            catch (IOException ignore)
            {
               // Ignore
            }
         }
         try
         {
            os.close();
         }
         catch (IOException ignore)
         {
            // Ignore
         }

         HttpURLConnection.setFollowRedirects(redirect);
      }

      return "";
   }
}