URI and URL

Recently saw a lot about the URI and URL of the content, at first only know the URL, but also thought it was a mistake in the blog, today just saw an introduction to the two concepts of the blog, recorded.

Gradually understand that these two concepts will be used in JavaBean, such as: Imgurl,logouri.

There are essentially three concepts: Uri/rul/run

The URI, which is the Uniform Resource identifier, is the Uniform Resource identifier used to uniquely identify a resource.

URL, the Uniform Resource Locator, a unified resource Locator, is a specific URI that the URL can use to identify a resource, and also how to locate the resource.

Urn,uniform resource Name, unified resource naming, identifies resources by name, such as Mailto:[email protected].

In general, URIs define uniform resource identities in an abstract, high-level concept, whereas URLs and urns are specific resource identities. URLs and urns are all a kind of URI.

In Java, a URI instance can represent an absolute or relative, as long as it conforms to the syntax rules of the URI . The URL class not only conforms to semantics, but also contains information that locates the resource , so the URL cannot be relative and the schema must be specified.

Resources:

Http://www.cnblogs.com/gaojing/archive/2012/02/04/2413626.html

Http://docs.oracle.com/javase/1.5.0/docs/api/java/net/URI.html

Http://en.wikipedia.org/wiki/Uniform_Resource_Identifier

Http://docs.oracle.com/javaee/5/api/javax/servlet/http/HttpServletRequest.html

URI and URL