URI vs URL vs URN? Classes like URL generally wrap the string and provide utility methods that String would have no reason to supply. What is this oddly shaped hinged device with indentations? Spring's Resource). Every URL is a URI; Every URN is a URI; URI and URL are NOT interchangeable – a URL is a URI, but a URI is not always a URL; URLs always contain an access mechanism. Because one of Java's early design goals was to be run inside of a browser, as a sandboxed application (applets!) The one is a mean to name and operate on files the other is a method to name and read from resources (which can be files). Only if you want to pass the resource to some component which can work only with files, you need to get File from it. What's the difference between a method and a function? What is the difference between a URI, a URL and a URN? How can a "hero" with blue and orange morality be made relatable? A resource can be something as simple as a file or a directory, or it can be a reference to a more complicated object, such as a query to a database or to a search engine. What's the logic behind dividing rental price of capital and wage rate by price level? Remember in Java a File object does not really represents "a file" but the location (the full name, with path) of a file. From the JRE point of view, it's just a term. It's used to modify files, open them etc. A Uniform Resource Name (URN) is a URI that identifies a resource by name in a particular namespace. Your email address will not be published. The difference between getFile() and getPath() is explained here: What's the difference between url.getFile() and getpath()? class ResourceBundle, UIResource, Resource) that are not, in this sense, a resource. URLs: An URL is a definite location on the internt (just a normal webaddress like - stackoverflow.com). Difference Between Identifier and Variable, Difference Between GET and POST Method in HTML, Difference Between Keyword and Identifier, Difference Between Logical and Physical Address in Operating System, Difference Between Preemptive and Non-Preemptive Scheduling in OS, Difference Between Synchronous and Asynchronous Transmission, Difference Between Paging and Segmentation in OS, Difference Between Internal and External fragmentation, Difference Between while and do-while Loop, Difference Between Pure ALOHA and Slotted ALOHA, Difference Between Recursion and Iteration, Difference Between Go-Back-N and Selective Repeat Protocol. ;). Why does T S Eliot use "he do" in The Rum Tum Tugger? Most of the confusion with these two is because they are related. There’s a third acronym that you might run into: URN, or Universal Resource Name. To learn more, see our tips on writing great answers. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. Comparison Chart; Definition; Key Differences; Conclusion URI provides a technique for defining the identity of an item. A URL is a URI, but a URI can never be a URL. How to change the file system of a partition in a RAID 1? URLs are a subset of URIs. Loosely said, Java uses this to refer to a "file" that may not be a file but does represent a named piece of data. A URI identifies a resource either by location, or a name, or both. Difference between StringBuilder and StringBuffer. However, pick the one you need: file-URLs may not typically have query components, but I could sure add one anyway. My answer is something I wrote for my own benefit, trying to explain the difference from a layman's perspective. As he says, the word "file" has totally different (practically unrelated) meanings in URL#getFile vs java.io.File - may be that's part of the confusion. If these are features you need, then File or Path provide them. Does an AME's advertisement on the back of the medical certificate affect the document's validity under the FAA? URL specifies, what type of protocol is to be used whereas URI doesn’t involve the protocol specification. Unfortunately, because "resource" is also a useful generic term outside of this interpretation, it is also used to name very specific things (e.g. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. URL links a web page, a component of a web page or a program on a web page with the help of accessing methods like protocols. with very limited rights/privileges/security clearance, Java makes a clear (theoretical) difference between a file (something on the local file system) and a resource (something it needs to read). There is a fair bit of discussion regarding when and how you should properly use the term URI vs URL. All the previous answers cover different aspects of the difference. A, The heart of your problem is that the words, Generally, you should minimize usage of URL unless it is absolutely needed. UPDATE 2017-04-12 Check JvR's answer as it contains more exhaustive and exact explanation! URI (uniform resource identifier) identifies a resource (text document, image file, etc) URL (uniform resource locator) is a subset of the URIs that include a network location; URN (uniform resource name) is a subset of URIs that include a name within a given space, but no location; That is: And for an example: URL might not be enough because File gives you access to housekeeping data such as permissions (readable, writable, executable), file type (am I a directory? Class URL represents a Uniform Resource Locator, a pointer to a "resource" on the World Wide Web. If the jar file is on the local file system, you should not have a query component, so URL.getPath and URL.getFile should return the same result. The two terms Uniform Resource Identifier (URI) and Uniform Resource Locator (URL) are sometimes used interchangeably. URL additionally contains a scheme that hints at how to reach the resource (with "file:" being "ask the host platform"), and so allows pointing at resources through HTTP, FTP, inside a JAR, and whatnot. A File is an abstract representation of an entity in the local filesystem. What's the difference between @Component, @Repository & @Service annotations in Spring? URL provides a technique for describing an item's identity. It will typically represent a system dependent file path. The reason is that the URL's. To understand how these terms came to mean what they do, it is important to recognise two things that influence Java's design: I'll walk through the concepts and how they came to be. The difference between URI and URL is conceptual and mostly academic, but URI is better defined in a formal sense, and covers a wider range of use cases. URLs can lead to file-system resources and you can construct URL for every file system resource by using file:// protocol (hence File <-> URL relation). By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. The "abstract representation" part is quoted from the API docs. The difference between URI and URL may be a bit confusing, but the following section will guide you through both the above topics and try to increase your understanding regarding the difference between URI and URL. It usually doesn't include the filename. It could be an entry in a ZIP file, a file reachable through FTP or SSH-FS, a multi-rooted representation of the application classpath, or really anything that can be meaningfully represented through the FileSystem interface and its driver, FileSystemProvider. A resource can correspond to a regular file in the local filesystem (specifically, when its URL begins with file://). URIs: Ever URL is an URI. URLs and URNs. They are used to load files out of jars / containers. Unlikely. When is a closeable question also a “very low quality” question? I'll answer your other, specific questions after that, because I may have to refer to something in the first part. No such thing as Resource, at least not in the sense you're talking about. Resource: Resources are files inside your jar. For starters, URI stands for uniform resource identifier and URL stands for uniform resource locator. It contains only the name of the file, so it is really more a path (see later) that the host platform interprets according to its own settings, rules, and syntax. ISBN. Just going through it, but already have the first follow-up question: When you say a File "contains only the name of the file", don't you contradict your initial statement that it's "An abstract representation of file and directory pathnames" - i.e.more? Running power to garage. The getFile and getPath methods deal with the components of an URL which are (confusingly) named like file objects. URI and URL are differ by the protocol to retrieve the resource. I'm totally confused right now - mostly because of the terminology, I guess. Stack Overflow for Teams is a private, secure spot for you and Also be aware that that URL#getFile is unrelated to java.io.File. In short, the main difference between a URI and a URL is that the former acts as a resource identify either by location name or both, while the latter acts as the location. Just because a method is named getResource doesn't mean it returns an object of type Resource. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. There are many things named like it, but they are not a resource in the sense of ClassLoader.getResource. The File class represents a resource that is reachable through the platform's native file system. The fact that a URI can identify a resources by both name and location has lead to a lot of the confusion in my opinion. (There is no Resource class in Java to represent a resource, but neither there is one to represent a file! An object that may be used to locate a file in a file system. As I understand them, you could categorize them as following: It would be easier if they would be merged into one class - they are really confusing :D, (I just took a look at the documentation - look at docs.oracle.com). once more : File is not a file, it's the path of a file). But URIs are not confined to web development. Some older API may require File, though. I don't think there is any sort of ironclad rule about when something has to be a URI vs a URL. URLs are a type of URI because they allow you to identify a particular resource on the web. Oh, and there are also calls to URL url = resource.toURI(); and String file = resource.getFile(). A path is generally a string indicating the location of a file within a file system. A URN may be used to talk about a resource without implying its location or how to access it. Ultimately the best way to figure out what a Class's methods do is to create an instance of it in your code, call the methods and then either step through in debug mode or send the results to System.out. path an file strings) differ? But URIs can also contain things like "mailto:", so they are also, well some what of a "script" I'd say. What's the difference between a proxy server and a reverse proxy server? Some frameworks provide you with such class (e.g. There are various access mechanisms a URL can use, depending on the type of resource and its location. Is the difference between URI and URL in Java that the former doesn't encode spaces? It makes sure the path you are building is valid. So, a File object allows you to locate (and open) a file, as a URLallows you to access (and open) a resource. In tandem with the concept of a resource, the URL represents that resource the same way the File class represents a file in the host platform: as a structured string that points to a resource. But a resource is more general (it can be also some file stored in a jar, or some data to be read from the network, or from memory, or...).

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