How Servlet works

Container: Tomcat

The three big life-cycle moment

To conclude, override init( ) if you wanna connect to database or do other initialization, and then Override doGet( ) and/or doPost( ) to process request. 

Requst & response

HttpServletRequest  request

.getParameter(String s): String

.getParameterValues(String s): String[ ]

void setAttribute(String name,Object o)

getRequestDispatcher(String s): RequestDispatcher

HttpServletResponse  response

setContentTyoe( )

getOutputStream( )

getWriter( )

MIME:

Multipurpose Internet Mail Extensions (MIME) is an Internet standard that extends the format of email to support.

Two choices fro output: 

characters or bytes