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Java Servlets are server-side Java program modules that process and answer client requests and implement the servlet interface. It helps in enhancing Web server functionality with minimal overhead, maintenance and support.
A servlet acts as an intermediary between the client and the server. As servlet modules run on the server, they can receive and respond to requests made by the client. Request and response objects of the servlet offer a convenient way to handle HTTP requests and send text data back to the client.
Since a servlet is integrated with the Java language, it also possesses all the Java features such as high portability, platform independence, security and Java database connectivity.
There are two Java Servlet types: Basic and HTTP.
HTTP servlets are used as follows:
However, Java Servlets have many advantages over CGI, including: