Servlets

Read the implicit HTTP request data sent by the browser – These data can be of two types, one is the explicit data that the end user enters in a form and the other is the behind-the-scenes HTTP information.
Generate the results – This process require talking to a database, executing an RMI or EJB call, invoking a Web service, or computing the response directly.

Send the explicit data to the client – This explicit data are the documents that can be sent in a variety of formats, including text (HTML or XML), binary (GIF images), or even a compressed format like zip.

Send the implicit HTTP response data – Finally the sending of the implicit HTTP response data that can be of two varieties, one is the document itself and the other is the behind-the-scenes HTTP information.

Java Servlets are more efficient, easier to use, more powerful, more portable, safer and cheaper than the traditional CGI and many alternative CGI-like technologies. The advantages of Servlets over the traditional CGI are as below:

Efficient

Convenient

Powerful

Portable

Inexpensive

Secure

Mainstream

Java Servlets are the programs with HTML embedded inside of them. A somewhat oversimplified view of JSP documents is that they are HTML pages with Java code embedded inside of them. JSP document is just another way of writing a servlet. JSP pages get translated into servlets, the servlets get compiled, and it is the servlets that run at request time.

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