Easy way to understand how SERVLET work

Do you know what is servlet? Ok here is a quik refresher for you.

Servlets are commonly used as an efficient platform-independent replacement for Common Gateway Interface (CGI) scripts.

A programmatic point of view:

• a servlet resembles an applet;
• it is an executable that's written in the JavaTM programming language,
• usually (though not always) is executed in response to an invocation from an HTML page.

SERVLET Element:

• Efficient and scalable because [ don't create new processes every time they execute ]
• servlets are handled by separate threads within the Web server process.
• Can write to server log files and can take advantages of other server capabilities [ they run in the server's own process ].
• Designed to fulfill the "Write Once, Run AnywhereTM" [ promise inherent in the Java programming language] .
• Servlets can be executed without modification on any platform.
  
  

Diagram: Common ways of using a servlet in Web server environment

A user (1) requests some information by filling out a form containing a link to a servlet and clicking the Submit button (2).

The server (3) locates the requested servlet (4).

The servlet then gathers the information needed to satisfy the user's request and constructs a Web page (5) containing the information.

That Web page is then displayed on the user's browser (6).

sources: http://java.sun.com/

note:
Now i remember it~ heeheehee.. -white02