Remote File Size

How can I discover the size of a remote file stored on an HTTP server?

The HTTP protocol supports the transfer of extra information about thecontent referenced by a URL. This information is stored in the HTTPheader fields. The Content-Length header provides the size of theobject referenced by the URL. Not all web servers will provide thisinformation, so you should not develop your client code to rely on itsavailability.

The class provides access to any arbitrary HTTPheader field through the getHeaderField() method, which will returnthe value of header as a string. Two other methods,getHeaderFieldDate() and getHeaderFieldInt(), will return the valuesof fields containing dates or integers as Date and int typesrespectively. They are convenience methods that save you the troubleof parsing the header field. URLConnection also provides conveniencemethods for accessing commonly used header fields, such asLast-Modified, Content-Type, and, yes, even Content-Length. The valueof the Content-Length header is directly returned as an integer bygetContentLength(). If the header value does not exist, the methodreturns -1.

Before querying the value of a header, you first need to establish aconnection. The normal way to do this is to create a URL instancethat points to the object you want to access, and then create aURLConnection with openConnection(). The following exampledemonstrates how to open a URLConnection and obtain the byte length ofthe content referenced by the URL.

import*;import*;public final class URLFileSize {  public static final void main(String[] args) {    URL url;    URLConnection connection;    int fileSize;    if(args.length != 1) {      System.err.println("Usage: URLFileSize ");      return;    }    try {      url = new URL(args[0]);      connection = url.openConnection();      fileSize = connection.getContentLength();      if(fileSize < 0)	System.err.println("Could not determine file size.");      else	System.out.println(args[0] + "
Size: " + fileSize);      connection.getInputStream().close();    } catch(IOException e) {      e.printStackTrace();    }  }}
Share the Post:
Share on facebook
Share on twitter
Share on linkedin


The Latest

iOS app development

The Future of iOS App Development: Trends to Watch

When it launched in 2008, the Apple App Store only had 500 apps available. By the first quarter of 2022, the store had about 2.18 million iOS-exclusive apps. Average monthly app releases for the platform reached 34,000 in the first half of 2022, indicating rapid growth in iOS app development.

microsoft careers

Top Careers at Microsoft

Microsoft has gained its position as one of the top companies in the world, and Microsoft careers are flourishing. This multinational company is efficiently developing popular software and computers with other consumer electronics. It is a dream come true for so many people to acquire a high paid, high-prestige job

your company's audio

4 Areas of Your Company Where Your Audio Really Matters

Your company probably relies on audio more than you realize. Whether you’re creating a spoken text message to a colleague or giving a speech, you want your audio to shine. Otherwise, you could cause avoidable friction points and potentially hurt your brand reputation. For example, let’s say you create a