uniform resource locator

url

1. Uniform resource locator in java M.Rajshree M.sc(IT) Nadar saraswathi college of arts&science

2. Uniform resource locator URL stands for  U niform  R esource  L ocator is the global address of documents and other resources on the World Wide Web. Its main purpose is to identify the location of a document and other resources available on the internet, and specify the mechanism for accessing it through a web browser . An  example  of a  URL  is https://www.computerhope.com, which is the  URL  for the Computer Hope website. Overview of a  URL .

3. A URL (Uniform Resource Locator) is a unique identifier used to locate a resource on the internet. It is also referred to as a web address. URLs consist of multiple parts including a protocol and domain name that tell a web browser how and where to retrieve a resource The URL contains the name of the protocol needed to access a resource, as well as a resource name

4. Components of a URL The protocol or scheme . Used to access a resource on the internet. Protocols include http, https, ftp, and file. The resource is reached through the domain name system name. In this example, the protocol is https. Host name or domain name . The unique reference the represents a webpage. For this example, whatis.techtarget.com. Port name.  Usually not visible in URLs, but necessary. Always following a colon, port 80 is the default port for web servers, but there are other options. For example, :port80. Path . A path refers to a file or location on the web server. For this example, search/query.

5. Query Found in the URL of dynamic page. The query consists of a question mark, followed by parameters. For this example, ? Parameters Pieces of information in a query string of a URL. Multiple parameters can be separated by ampersands (&) For this example, q=URL Fragment . This is an internal page reference, which refers to a section within the webpage. It appears at the end of a URL and begins with a hashtag (#)

6. Protocol Identifier Note that the protocol identifier and the resource name are separated by a colon and two forward slashes. The protocol identifier indicates the name of the protocol to be used to fetch the resource. The example uses the Hypertext Transfer Protocol (HTTP), which is typically used to serve up hypertext documents. HTTP is just one of many different protocols used to access different types of resources on the net. Other protocols include File Transfer Protocol (FTP), Gopher, File, and News.

7. Resource Name The resource name is the complete address to the resource. The format of the resource name depends entirely on the protocol used, but for many protocols, including HTTP, the resource name contains one or more of the following components: Host Name The name of the machine on which the resource lives. Filename The pathname to the file on the machine. Port Number The port number to which to connect (typically optional).

8. Required Data For many protocols, the host name and the filename are required, while the port number and reference are optional. For example, the resource name for an HTTP URL must specify a server on the network (Host Name) and the path to the document on that machine (Filename). It also can specify a port number and a reference.

9. Constructing a URL The easiest way to create a URL object is from a String that represents the human-readable form of the URL address. In your Java program, you can use a String containing this text to create a URL object: URL myURL = new URL("http://example.com/"); The URL object created above represents an absolute URL . An absolute URL contains all of the information necessary to reach the resource in question. You can also create URL objects from a relative URL address. A relative URL contains only enough information to reach the resource relative to (or in the context of) another URL.

10. The  URL  is the address of a website. You can find it in the address bar of your web browser. Alternatively, you can find the  URL  for a link by right-clicking it and copying the link Your  computer's URL  code (or Internet address, or IP address) is the address that other  computers  enter in to access your  computer  across the Internet. This is a four-section number, such as 123.456.78.90 . The  URL  (uniform resource locater) means the address to something on the internet. It could be a webpage, file, or a picture. In the case of  Youtube , it is the address of where a particular video is located