What is the function of java servlet?

#What is the function of java servlet?

Servlet extends the capabilities of a server by creating a framework for providing request and response services on the Web. Generally speaking, a servlet is specially used to receive client requests and client request data, and then calls the underlying service to process the data and generate result return data. When the client sends a request to the server, the server can send the request information to the Servlet and let the Servlet build the response that the server returns to the client. Servlets can be loaded automatically when a Web server is started or when a client requests a service for the first time. After loading, the servlet continues to run until other clients make requests. Servlets have a wide range of functions. For example, Servlet can complete the following functions:
(1) Create and return a complete HTML page containing dynamic content based on the nature of the customer's request.
(2) Create a portion of an HTML page (HTML fragment) that can be embedded into an existing HTML page.
(3) Communicate with other server resources, including databases and Java-based applications.
(4) Use multiple clients to handle connections, receive input from multiple clients, and broadcast the results to multiple clients. For example, a Servlet can be a multi-participant game server.
(5) When data transmission is allowed in single connection mode, open a new connection from the server to the applet on the browser and keep the connection
open. An applet can also initiate a connection between the client's browser and the server, allowing the client and server to perform sessions simply and efficiently. Communication can occur via custom protocols or standards such as IIOP.
(6) Use MIME type filtering data for special processing, such as image conversion and server-side includes (SSI).
(7) Standard routines that provide customized processing to all servers. For example, a servlet can modify how users are authenticated.

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