What is Servlet?

Servlet is a server-side application written in Java. It is platform- and protocol-independent and can generate dynamic Web pages; it handles client requests (Web browsers or other HTTP client programs) and Middle tier for server responses (database or application on HTTP server).

Servlet is a server-side Java application that is platform- and protocol-independent and can generate dynamic Web pages. Servlet runs in Java-enabled Web Server. Java Servlet can dynamically expand the capabilities of the Server and provide Web services using the request-response model.

Servlet is a server-side Java application located inside the Web server. Unlike traditional Java applications started from the command line, Servlet is loaded by the Web server. The Web server must contain a Java virtual machine that supports Servlet. .

Since HTML code is always nested in SERVLET, the front-end and back-end code does not look very clear, so SUN developed JSP to solve this problem and process the front-end and back-end separately, which is the MVC mode.

A Servlet is a Java program that runs on a Web server as an intermediary layer between requests from a Web browser or other HTTP clients and the HTTP server's database and applications. All JSP files must be converted into a Servlet before they can be run. All JSP files must be converted into a Servlet before they can be run.

Servlet can complete the following tasks by processing user information on the server side.

(1) Obtain the data and related information submitted by the client browser through the HTML form.

(2) Create and return a dynamic response page to the client.

(3) Access server-side resources, such as files and databases.

(4) Prepare dynamic data for JSP pages and collaborate with JSP to create responsive pages.

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