Java URL Read getBytes(URL url)

Description

get Bytes

License

Open Source License

Declaration

private static byte[] getBytes(URL url) throws IOException 

Method Source Code

//package com.java2s;
/*// w w  w  .  j av  a 2  s. co m
 * Copyright 2005-2006 Sun Microsystems, Inc.  All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun in the LICENSE file that accompanied this code.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */

import java.io.InputStream;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.net.URL;
import java.net.URLConnection;

public class Main {
    private static byte[] getBytes(URL url) throws IOException {
        URLConnection uc = url.openConnection();
        if (uc instanceof java.net.HttpURLConnection) {
            java.net.HttpURLConnection huc = (java.net.HttpURLConnection) uc;
            int code = huc.getResponseCode();
            if (code >= java.net.HttpURLConnection.HTTP_BAD_REQUEST) {
                throw new IOException("open HTTP connection failed.");
            }
        }
        int len = uc.getContentLength();
        InputStream in = new BufferedInputStream(uc.getInputStream());

        byte[] b;
        try {
            if (len != -1) {
                // Read exactly len bytes from the input stream
                b = new byte[len];
                while (len > 0) {
                    int n = in.read(b, b.length - len, len);
                    if (n == -1) {
                        throw new IOException("unexpected EOF");
                    }
                    len -= n;
                }
            } else {
                b = new byte[8192];
                int total = 0;
                while ((len = in.read(b, total, b.length - total)) != -1) {
                    total += len;
                    if (total >= b.length) {
                        byte[] tmp = new byte[total * 2];
                        System.arraycopy(b, 0, tmp, 0, total);
                        b = tmp;
                    }
                }
                // Trim array to correct size, if necessary
                if (total != b.length) {
                    byte[] tmp = new byte[total];
                    System.arraycopy(b, 0, tmp, 0, total);
                    b = tmp;
                }
            }
        } finally {
            in.close();
        }
        return b;
    }
}

Related

1. getBodyResponse(HttpURLConnection con)
2. getBytes(URL url)
3. getFileContentFromWeb(final URL srcUrl, final FileOutputStream destination)
4. getFileSize(String sURL)
5. getFileSize(URL url)
6. getFilesizeFromUrl(String urlString)