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- #JAVA DOWNLOAD FILE FROM URL HOW TO#
- #JAVA DOWNLOAD FILE FROM URL CODE#
- #JAVA DOWNLOAD FILE FROM URL ZIP#
Try it: curl Įven with the small amount of HTML code that makes up the webpage, it's too much for human eyes to process (and reading raw HTML wasn't meant for humans).
#JAVA DOWNLOAD FILE FROM URL ZIP#
If you curl without any options except for the URL, the content of the URL (whether it's a webpage, or a binary file, such as an image or a zip file) will be printed out to screen. Write programs to handle text streams, because that is a universal interface. This is the Unix philosophy: Write programs that do one thing and do it well. Before you try it, think about another part of the Unix philosophy: The last thing to consider is what happens when you just curl for a URL with no options (which, after all, should be optional). But try the following: curl -s -o my.fileĪnd you will have a problem. That's because the -s option doesn't take an argument. So it always pays to read the documentation with every new command.
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If you instead executed this: curl -o -s my.file
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The argument must follow after the -o…because curl. Now watch out: the number of hyphens is not something you can mess up on the following commands would cause an error or other unexpected behavior: curl -o my.file -silentĪlso, mind the position of my.file, which can be thought of as the argument to the -o option. In fact, -output can be shortened to -o curl -o my.file -s Many options for many tools have a shortened alias.
#JAVA DOWNLOAD FILE FROM URL HOW TO#
There are many, many more options, but for now, we know how to use curl to do something that is actually quite powerful: fetch a file, anywhere on the Internet, from the simple confines of our command-line.īefore we go further, though, let's look at the various ways this simple command can be re-written and, more crucially, screwed up: Shortened optionsĪs you might have noticed in the -silent documentation, it lists the alternative form of -s. So those are the basics for the curl command. It will still output the data you ask for, potentially even to the terminal/stdout unless you redirect it. Don't show progress meter or error messages. In curl's documentation of options, there is an option for silence: The curl progress indicator is a nice affordance, but let's just see if we get curl to act like all of our Unix tools. As far as the computer cares, it just joins the two lines together as if that backslash weren't there and runs it as one command. This is solely to make it easier for you to read. In this case, the command is so long (because of the URL) that I broke it down into two lines with the use of the backslash, i.e. Quick note: If you're new to the command-line, you're probably used to commands executing every time you hit Enter. Let's try it with a bigger file (this is the baby names file from the Social Security Administration) to see how the progress indicator animates: curl \ For a very small file, that status display is not terribly helpful. In the example of curl, the author apparently believes that it's important to tell the user the progress of the download. Rule of Silence: When a program has nothing surprising to say, it should say nothing. If you remember the Basics of the Unix Philosophy, one of the tenets is: Let's back up a bit: when you first ran the curl command, you might have seen a quick blip of a progress indicator: % Total % Received % Xferd Average Speed Time Time – you will the HTML that powers I thought Unix was supposed to be quiet? Using the ls command will show the contents of the directory: lsĪnd if you use cat to output the contents of my.file, like so: cat my.file So let's confirm that a file named my.file was actually downloaded. Let's try it with a basic website address: curl -output my.fileīesides the display of a progress indicator (which I explain below), you don't have much indication of what curl actually downloaded. That -output flag denotes the filename ( some.file) of the downloaded URL ( ) This is the basic usage of curl: curl -output some.file Other times we might pipe it directly into another program. Sometimes we want to save a web file to our own computer. The curl tool lets us fetch a given URL from the command-line. How to download files straight from the command-line interface
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