Java Servlet is a server-side Java program module used to process and answer client requests and implement the servlet interface. It helps enhance web server functionality with minimal overhead, maintenance and support. The following article will introduce you to Java Servlet, I hope it will be helpful to you.
Introduction to Java servlets
A servlet acts as an intermediary between the client and the server. When servlet modules run on the server, they can receive and respond to requests from clients and can handle complex requests obtained from the web server. The servlet's request and response objects provide a convenient way to handle HTTP requests and send text data back to the client.
Since servlet is integrated with Java language, it also has all Java features such as high portability, platform independence, security and Java database connectivity.
Types of Java servlets
There are two types of Java Servlets: Basic and HTTP.
Basic Servlet is a subclass of javax.servlet.GenericServlet. The service() method needs to be implemented to handle client requests.
HTTP Servlet is a subclass of javax.servlet.HttpServlet; has built-in HTTP protocol support. The doGet and doPost methods are used to handle client requests (GET or POST requests).
For these two servlet types, we can implement the constructor method init() and the destructor method destroy() to initialize or release resources.
All servlets must implement a service() method, which is responsible for processing servlet requests. For a generic servlet, simply override the service method to provide a routine for handling requests.
HTTP servlet provides a service method that automatically routes requests to another method in the servlet based on the HTTP transport method used. So, for HTTP servlets, override doPost() to handle POST requests, doGet() to handle GET requests, and so on.
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