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When the internet/web was young... there was the webserver. But it didn't do much except fulfill requests for files. Mostly images and .html documents, and such.
However, someone noticed that a C program has stdin, stdout and stderr streams... So they made a file extension called .cgi (Common Gateway Interface) and told the webserver that when a request was made to this .cgi file... that it shouldn't SEND a .cgi file to the requestor... instead it should RUN the file as a program, get the program's output and sent THAT output to the browser.
Thus web apps were born.
Browser Request -> Webserver -> Stdin -> C program... ->>>
Stdout -> Webserver -> Response to user's browser.
Sun Microsystems wanted to use java for web apps. So, they made tiny classes called "Servlets" (mini-Server programs) to run instead of the C programs/Perl programs everyone else was using.
Servlets work like:
Browser Request -> Webserver -> Java -> Stdin -> java Servlet Class.. ->>>
Stdout -> Webserver -> Response to user's browser.
That's pretty much is. A Java Servlet is a program that accepts data, does some processing and then spits out results that a webbrowser would understand.
Hope this answers your question.
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∙ 15y ago
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