A
servlet configuration object used by a servlet container to pass
information to a servlet during initialization.
header.jsp
<%@page contentType="text/html" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Servlet Config</title> </head> <body> <form method="get" action="/servlet/ServletConfigParam"> <input type="submit" value="Click Me"> </form> </body> </html>
web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app version="3.1" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"> <servlet> <servlet-name>ServletConfigParam</servlet-name> <servlet-class>ServletConfigParam</servlet-class> <init-param> <param-name>Author</param-name> <param-value>Krishna</param-value> </init-param> <init-param> <param-name>Book</param-name> <param-value>Self Learning Java</param-value> </init-param> <init-param> <param-name>URL</param-name> <param-value>self-learning-java-tutorial.blogspot.com</param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>ServletConfigParam</servlet-name> <url-pattern>/ServletConfigParam</url-pattern> </servlet-mapping> </web-app>
ServletConfigParam.java
import java.io.IOException; import java.io.PrintWriter; import javax.servlet.*; import javax.servlet.http.*; public class ServletConfigParam extends HttpServlet { @Override public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException{ PrintWriter out = res.getWriter(); res.setContentType("text/html"); /* Get the Servlet Config Object */ ServletConfig conf = getServletConfig(); String author = conf.getInitParameter("Author"); String book = conf.getInitParameter("Book"); String url = conf.getInitParameter("URL"); String str = "<html>" + "<head>" + "<title> Hello World </title>" + "</head>" + "<body>" + "<h1> <br />" + "Author :" + author +"<br />" + "Book : "+ book +"<br />" + "URL : " + url + "</h1> </body>" + "</html>"; out.println(str); } }
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