public
String getInitParameter(String name)
Returns
a String containing the value of the named context-wide
initialization parameter, or null if the parameter does not exist.
Main.jsp
<%@page contentType="text/html" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>JSP Page</title> </head> <body> <form method="get" action="/servlet/ServletContextParam"> <input type="submit"> </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>ServletContextParam</servlet-name> <servlet-class>ServletContextParam</servlet-class> </servlet> <servlet-mapping> <servlet-name>ServletContextParam</servlet-name> <url-pattern>/ServletContextParam</url-pattern> </servlet-mapping> <context-param> <param-name>mailId</param-name> <param-value>abcabc@gmail.com</param-value> </context-param> <context-param> <param-name>phoneNum</param-name> <param-value>1234567890</param-value> </context-param> </web-app>
ServletContextParam.java
import java.io.*; import javax.servlet.*; import javax.servlet.http.*; public class ServletContextParam extends HttpServlet { @Override public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException{ try(PrintWriter out = res.getWriter()){ String header = "<html>" + "<head>" + "<title> Hello World </title>" + "</head>" + "<body>" + "<h1> <br />"; String footer = "</h1> </body>" + "</html>"; ServletContext context = req.getServletContext(); String mailId = context.getInitParameter("mailId"); String phoneNum = context.getInitParameter("phoneNum"); out.println(header); out.println("mail:" + " " + mailId +"<br />"); out.println("Phone: " + phoneNum); out.println(footer); } } }
Output
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