: URL « Network « Java Tutorial

A URL is a unique address to an Internet resource. Here is a URL:

  1. HTTP: the protocol to use to retrieve the resource.
  2. the host, where the resource resides.
  3. 80 is the port number.
  4. /index.htm specifies the path of the URL.

In Java, a URL is represented by a object.

public URL (java.lang.String spec)
public URL (java.lang.String protocol, java.lang.String host,java.lang.String file)
public URL (java.lang.String protocol, java.lang.String host,int port, java.lang.String file)
public URL (URL context, String spec)
URL myUrl = new URL ("");

Because no page is specified, the default page is assumed. The following lines of code create identical URL objects.

URL yahool = new URL ("");
URL yahoo2 = new URL ("", "/index.html");
URL yahoo3 = new URL ("", 80, "/index.html");

19.2.1.Creating a URL With components
19.2.2.Creating a URL with a single string.
19.2.3.Create a URL that refers to a jar file in the file system
19.2.4.Create a URL that refers to an entry in the jar file
19.2.6.A class that displays information about a URL
19.2.8.Parsing a URL
19.2.9.Eliminate Query
19.2.10.Parse Host
19.2.11.Parse Port
19.2.12.Make a URL from the given string
19.2.13.Create BufferedInputStream from URL
19.2.14.Utility to convert File to URL.
19.2.15.Read from URL
19.2.16.Get Content from a URL
19.2.17.Save binary file from URL
19.2.18.Reading A Web Resource: Opening a URL's stream
19.2.19.Relative URL
19.2.20.Resolve a relative URL
19.2.21.Build query string for URL
19.2.22.URL Equality
19.2.23.URL Splitter URL('')
19.2.25.Getting Text from a URL
19.2.26.Getting an Image from a URL
19.2.27.Getting a Jar File Using a URL
19.2.28.File size from URL
19.2.29.Returns true if the URL represents a path, and false otherwise.
19.2.30.Locating files by path or URL
19.2.31.provides a simple interface for assembling GET URLs
19.2.32.Add Parameter to URL
19.2.33.Extracts the base URL from the given URL by stripping the query and anchor part.
19.2.34.Returns the anchor value of the given URL