Java URL Read getRemoteFileSize(URL url)

Description

get Remote File Size

License

Open Source License

Declaration

public static int getRemoteFileSize(URL url) throws IOException 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright (c) 2014 Liviu Ionescu./* w  w w. ja va 2s .c  om*/
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    Liviu Ionescu - initial version
 *******************************************************************************/

import java.io.IOException;

import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;

public class Main {
    public static int getRemoteFileSize(URL url) throws IOException {

        URLConnection connection;
        while (true) {
            connection = url.openConnection();
            if (connection instanceof HttpURLConnection) {
                int responseCode = ((HttpURLConnection) connection).getResponseCode();
                if (responseCode == HttpURLConnection.HTTP_OK) {
                    break;
                } else {
                    if (responseCode == HttpURLConnection.HTTP_MOVED_TEMP
                            || responseCode == HttpURLConnection.HTTP_MOVED_PERM
                            || responseCode == HttpURLConnection.HTTP_SEE_OTHER) {
                        String newUrl = connection.getHeaderField("Location");
                        url = new URL(newUrl);

                        // System.out.println("Redirect to URL : " + newUrl);
                    } else {
                        throw new IOException("Failed to open connection, response code " + responseCode);
                    }
                }
            }
        }

        int length = connection.getContentLength();

        if (connection instanceof HttpURLConnection) {
            ((HttpURLConnection) connection).disconnect();
        }

        return length;
    }
}

Related

1. getHTTPResponse(String url)
2. getHttpResponse(String urlStr)
3. getLastModified(HttpURLConnection conn)
4. getLastModified(HttpURLConnection connection)
5. getRemoteFileLength(String url)
6. getStreamByConnection(final HttpURLConnection con)
7. getStringFromConnection(HttpURLConnection connection)
8. getStringFromURL(String URLString)
9. getText(HttpURLConnection conn)