Java how to download a large file in browser

Java NIO is an alternative package to handle networking and input-output operations in Java. The main advantage that the Java NIO package offers is that it's non-blocking, and has channeling and buffering capabilities. When we use the Java IO library we work with streams that read data byte by byte. However, the Java NIO package uses channels and buffers. The buffering and channeling capabilities allow the system to copy contents from a URL directly into the intended file without needing to save the bytes in application memory, which would be an intermediary step.

The ability to work with channels boosts performance. The downloaded contents will be transferred to a file on the local system via the corresponding file channel.

After defining the file channel we will use the transferFrom method to copy the contents read from the readChannel object to the file destination using the writeChannel object. The transferFrom and transferTo methods are much more efficient than working with streams using a buffer.

The transfer methods enable us to directly copy the contents of the file system cache to the file on the system. Thus direct channeling restricts the number of context switches required and enhances the overall code performance. Now, in the following sections, we will be looking at ways to download files from a URL using third-party libraries instead of core Java functionality components. Now you may be thinking why would we use this when Java has its own set of libraries to handle IO operations.

However, Apache Commons IO overcomes the problem of code rewriting and helps avoid writing boilerplate code. In order to start using the Apache Commons IO library, you will need to download the jar files from the official website. When you are done downloading the jar files, you need to add them to use them.

If you are using an Integrated Development Environment IDE such as Eclipse , you will need to add the files to the build path of your project. There is only a single line of code required to download a file, which looks like:.

The connection and read timeouts convey the permissible time for which either the connection may stay idle or reading from the URL may stop. We will use the copy inputStream, fileOS method to download a file into the local system. Check out our hands-on, practical guide to learning Git, with best-practices, industry-accepted standards, and included cheat sheet.

Stop Googling Git commands and actually learn it! The function returns the number of bytes copied. Add a comment. Best wishes! Arsensys Arsensys 1 2 2 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast what if you could invest in your favorite developer? Who owns this outage?

Building intelligent escalation chains for modern SRE. Featured on Meta. Now live: A fully responsive profile. Reducing the weight of our footer. Related Hot Network Questions. Question feed. Stack Overflow works best with JavaScript enabled. This is not too different from the download an exe approach. The problem with this is that the user has to have the correct version of Java installed and has to have the Java Web Start capability setup correctly. Are users with restrictive firewalls like that likely to be permitted to install and run a.

Take a look at cURL. This article describes how to do a multi-part simultaneous download via HTTP. Set it as high as the OS allows and you should see up to 2x improvement depending on your physical network. Your mileage may vary. Edit: What exactly is this you're trying to accomplish? Who is the audience? I'm assumed for a bit that you're looking to do this over your own network; but you seem to imply the client side is someone on the internet.

I think we need clearer requirements. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Large File Download Ask Question. Asked 13 years, 2 months ago. Active 2 years, 6 months ago. Viewed 7k times. Rov 1 1 silver badge 10 10 bronze badges. TonyB TonyB 3, 2 2 gold badges 23 23 silver badges 22 22 bronze badges.

Add a comment. Active Oldest Votes. Edit: TonyB is it limited to port 80? Please don't use ActiveX I am so sick of sites that are only viewable in IE. While I appreciate the sensitivity around IE-only solutions, I'd suggest the same level of sensitivity around Windows-only solutions unless you meant.

Can you split the files into pieces and then rejoin them after the download? If you don't want to write java code in-house, there are commercial applet solutions available: Vault MyDownloder Both of them have eval versions that you can download and test.

Edmund Tay Edmund Tay 1, 1 1 gold badge 11 11 silver badges 10 10 bronze badges. A few ideas: Blizzard use a light-weight. I'm not entirely sure how it is done, but it looks like a branded version of the official BitTorrent client. See S3 documentation. John Oxley John Oxley I say click-once installed download manager, similar to msdn.