servlet config and servlet context

PHOTO EMBED

Thu Nov 21 2024 01:38:22 GMT+0000 (Coordinated Universal Time)

Saved by @sem 

import jakarta.servlet.ServletConfig;
import jakarta.servlet.ServletContext;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * Servlet implementation class servletex
 */
@WebServlet("/servletex")
public class servletex extends HttpServlet {
	private static final long serialVersionUID = 1L;

    private String configParam; // For ServletConfig parameter
    private String contextParam; // For ServletContext parameter

    @Override
    public void init(ServletConfig config) throws ServletException {
        super.init(config);

        // Using ServletConfig to get a servlet-specific init parameter
        configParam = config.getInitParameter("configParam");

        // Using ServletContext to get application-wide context parameter
        ServletContext context = config.getServletContext();
        contextParam = context.getInitParameter("contextParam");
    }

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setContentType("text/html");
        response.getWriter().println("<html><body>");
        response.getWriter().println("<h2>Using ServletConfig and ServletContext</h2>");

        // Display the servlet-specific config parameter
        response.getWriter().println("<p><strong>ServletConfig Parameter:</strong> " + configParam + "</p>");

        // Display the application-wide context parameter
        response.getWriter().println("<p><strong>ServletContext Parameter:</strong> " + contextParam + "</p>");

        response.getWriter().println("</body></html>");
    }

}




<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
         version="3.0">
  
    <!-- Servlet Config Parameters -->
    <servlet>
        <servlet-name>servletex</servlet-name>
        <servlet-class>servletex</servlet-class>
        <init-param>
            <param-name>configParam</param-name>
            <param-value>Servlet Specific Parameter</param-value>
        </init-param>
    </servlet>

    <servlet-mapping>
        <servlet-name>servletex</servlet-name>
        <url-pattern>/servletex</url-pattern>
    </servlet-mapping>

    <!-- ServletContext Parameters -->
    <context-param>
        <param-name>contextParam</param-name>
        <param-value>Application Wide Parameter</param-value>
    </context-param>

</web-app>
content_copyCOPY