Save URL contents to a file : HttpURLConnection « Network « Java Tutorial






/** 
 * 
 * The ObjectStyle Group Software License, version 1.1
 * ObjectStyle Group - http://objectstyle.org/
 * 
 * Copyright (c) 2002-2005, Andrei (Andrus) Adamchik and individual authors
 * of the software. All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 
 * 3. The end-user documentation included with the redistribution, if any,
 *    must include the following acknowlegement:
 *    "This product includes software developed by independent contributors
 *    and hosted on ObjectStyle Group web site (http://objectstyle.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 * 
 * 4. The names "ObjectStyle Group" and "Cayenne" must not be used to endorse
 *    or promote products derived from this software without prior written
 *    permission. For written permission, email
 *    "andrus at objectstyle dot org".
 * 
 * 5. Products derived from this software may not be called "ObjectStyle"
 *    or "Cayenne", nor may "ObjectStyle" or "Cayenne" appear in their
 *    names without prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE OBJECTSTYLE GROUP OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * 
 * 
 * This software consists of voluntary contributions made by many
 * individuals and hosted on ObjectStyle Group web site.  For more
 * information on the ObjectStyle Group, please see
 * <http://objectstyle.org/>.
 */

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.io.Serializable;
import java.lang.reflect.Member;
import java.lang.reflect.Modifier;
import java.net.URL;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.regex.Pattern;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;


import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;

/**
 * Contains various unorganized static utility methods used across Cayenne.
 * 
 * @author Andrei Adamchik
 */
public class Util {

  /**
   * Copies file contents from source to destination. Makes up for the lack of file
   * copying utilities in Java
   */
  public static boolean copy(File source, File destination) {
      BufferedInputStream fin = null;
      BufferedOutputStream fout = null;
      try {
          int bufSize = 8 * 1024;
          fin = new BufferedInputStream(new FileInputStream(source), bufSize);
          fout = new BufferedOutputStream(new FileOutputStream(destination), bufSize);
          copyPipe(fin, fout, bufSize);
      }
      catch (IOException ioex) {
          return false;
      }
      catch (SecurityException sx) {
          return false;
      }
      finally {
          if (fin != null) {
              try {
                  fin.close();
              }
              catch (IOException cioex) {
              }
          }
          if (fout != null) {
              try {
                  fout.close();
              }
              catch (IOException cioex) {
              }
          }
      }
      return true;
  }

  /**
   * Save URL contents to a file.
   */
  public static boolean copy(URL from, File to) {
      BufferedInputStream urlin = null;
      BufferedOutputStream fout = null;
      try {
          int bufSize = 8 * 1024;
          urlin = new BufferedInputStream(
                  from.openConnection().getInputStream(),
                  bufSize);
          fout = new BufferedOutputStream(new FileOutputStream(to), bufSize);
          copyPipe(urlin, fout, bufSize);
      }
      catch (IOException ioex) {
          return false;
      }
      catch (SecurityException sx) {
          return false;
      }
      finally {
          if (urlin != null) {
              try {
                  urlin.close();
              }
              catch (IOException cioex) {
              }
          }
          if (fout != null) {
              try {
                  fout.close();
              }
              catch (IOException cioex) {
              }
          }
      }
      return true;
  }

  /**
   * Reads data from the input and writes it to the output, until the end of the input
   * stream.
   * 
   * @param in
   * @param out
   * @param bufSizeHint
   * @throws IOException
   */
  public static void copyPipe(InputStream in, OutputStream out, int bufSizeHint)
          throws IOException {
      int read = -1;
      byte[] buf = new byte[bufSizeHint];
      while ((read = in.read(buf, 0, bufSizeHint)) >= 0) {
          out.write(buf, 0, read);
      }
      out.flush();
  }

}








19.6.HttpURLConnection
19.6.1.Get the date of a url connection
19.6.2.Get the document expiration date
19.6.3.Get the document Last-modified date
19.6.4.Show the content type
19.6.5.Show the content length
19.6.6.Display request method
19.6.7.Get response code
19.6.8.Display response message
19.6.9.Display header information
19.6.10.Download and display the content
19.6.11.A Web Page Source Viewer
19.6.12.Reading from a URLConnection
19.6.13.Use BufferedReader to read content from a URL
19.6.14.Check if a page exists
19.6.15.Identify ourself to a proxy
19.6.16.Connect through a Proxy
19.6.17.java.net.Authenticator can be used to send the credentials when needed
19.6.18.Read data from a URL
19.6.19.Dump a page using the HTTPS protocol
19.6.20.Save URL contents to a file
19.6.21.Http connection Utilities
19.6.22.Parsing and formatting HTTP dates as used in cookies and other headers.
19.6.23.Last Modified
19.6.24.URL connection and proxy
19.6.25.Http Constants
19.6.26.Http Header Helper
19.6.27.A utility class for parsing HTTP dates as used in cookies and other headers