Overview
The Servlet service() method processes and responds to incoming client requests. The servlet container calls this method, and the request cannot be served until the servlet’s init() method has been executed. This function is most commonly used in the HttpServlet class. The HttpServlet class includes methods such as doGet(), doPost(), doHead(), doTrace(), etc. that are particular to the HTTP protocol. To generate a response, you must override the doGet() or doPost() methods according to your needs.
Servlet service() method signature
The method signature of the service() method is as follows:
public void service(ServletRequest req,ServletResponse res)
throws ServletException, IOException
ServletRequest and ServletResponse are two objects passed by the servlet container. The client’s request is contained in the ServletRequest object, whereas the ServletResponse object includes the Servlet’s response. Both objects are crucial because they allow you to write code and define how the servlet responds to the client’s request.
During the processing of a request, the service() method may encounter two types of exceptions: ServletException and IOException. If any error occurs that obstructs the usual execution of the servlet, the service() method will throw a ServletException. On the other hand, if there is an input or output exception that arises while the service() method is executing, an IOException is thrown.
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