Parsing links Related Knowledge

The HTML may contain the label of the link we want to parse:

• <a>
• <frame>

Examples:

2.  1  Span style= "color: #0000ff;" ><  framesetcols  = "25%,75%"  Span style= "color: #0000ff;" >>  <  frame  src  = "frame_a.htm"  >  <  frame  src  = "frame_b.htm"  >  4  </ frameset  >  

1. <href= "url">Link text</a>

The images and audio at the beginning of the site must also contain links, but these are not the links we want to parse. None of these starts with <a>, such as displaying a picture on the site:

<src= "url"/>

Of course, the links we parse from the <a> tags will inevitably have links to pictures, audio, etc.Resources, we need to type judgment on the type of link. url-uniform Resource LocatorA Uniform Resource Locator (URL) is used to locate documents (or other data) on the World Wide Web. URLs, such as http://www.w3school.com.cn/html/index.asp, adhere to the following grammatical rules:

Scheme://host.domain:port/path/filename

Explain:

• Scheme-Defines the type of Internet service. The most common type is the HTTP
• Host-Defines the domain host (the default host for HTTP is www)
• Domain-Define Internet domain names, such as w3school.com.cn
• :p ORT-Defines the port number on the host (the default port number for HTTP is 80)
• Path-Defines the path on the server (if omitted, the document must be in the root directory of the Web site).
• FileName-Defines the name of the document/resource

URL schemes

Here are some of the most popular scheme:

Scheme	Access	used for ...
http	Hypertext Transfer Protocol	A normal web page that starts with http://. Not encrypted.
Https	Secure Hypertext Transfer Protocol	Secure Web page. Encrypt all information exchanges.
Ftp	File Transfer Protocol	Used to download or upload files to a Web site.
File		The files on your computer.

 From for notes (Wiz)

Parsing links Related Knowledge