哈尔滨工业大学：《网络应用开发》英文版 NAD-chapter6

Alternative Protocol Example File transfer service Protocol is FTP Example URL ftp: //ftp. Cs. purdue. edu/pub/comer/netbook/client c Can be used in anchor tae 哈工大计算机学院李全龙 Network Application Development Server Software Design 11

哈工大计算机学院 李全龙 Network Application Development Server Software Design 11 Alternative Protocol Example „ File transfer service „ Protocol is FTP „ Example URL ftp://ftp.cs.purdue.edu/pub/comer/netbook/client.c „ Can be used in anchor tag

Web server Running program Stores set of web documents Responds to request from browser by sending copy of document 哈工大计算机学院李全龙 Network Application Development Server Software Desi

哈工大计算机学院 李全龙 Network Application Development Server Software Design 12 Web Server „ Running program „ Stores set of Web documents „ Responds to request from browser by sending copy of document

Web document called a web pac ige One web page per file Can contain Binary image Text file Text standard Readable representation ASCII Specifies contents and layout Known as Hypertext Markup Language(HTML) 哈工大计算机学院李全龙 Network Application Development Server Software Design 13

哈工大计算机学院 李全龙 Network Application Development Server Software Design 13 Web Document „ Called a web page „ One web page per file „ Can contain „ Binary image „ Text file „ Text standard „ Readable representation ASCII „ Specifies contents and layout „ Known as Hypertext Markup Language (HTML)

Hypermedia Concept Web document contains mixture of Text Images Selectable pointers to other web pages Known as hypermedia 哈工大计算机学院李全龙 Network Application Development Server Software Design 14

哈工大计算机学院 李全龙 Network Application Development Server Software Design 14 Hypermedia Concept „ Web document contains mixture of „ Text „ Images „ Selectable pointers to other Web pages „ Known as hypermedia

Hypermedia Link On A Web document Associated with ob ject or area on screen Internally like a symbolic link Advantage Can reference document on another computer Disadvantage Can become invalid 哈工大计算机学院李全龙 Network Application Development Server Software Design 15

哈工大计算机学院 李全龙 Network Application Development Server Software Design 15 Hypermedia Link On A Web Document „ Associated with object or area on screen „ Internally like a symbolic link „ Advantage „ Can reference document on another computer „ Disadvantage „ Can become invalid