JSP Application Implicit Object In Java | JSP Application Implicit Object In Java In Hindi

JSP application implicit object

In JSP, application is an implicit object of type ServletContext.

The instance of ServletContext is created only once by the web container when application or project is deployed on the server.

This object can be used to get initialization parameter from configuaration file (web.xml). It can also be used to get, set or remove attribute from the application scope.

Example of application implicit object:

index.html

<form action="welcome">  

<input type="text" name="uname">  

<input type="submit" value="go"><br/>  

</form>

  

web.xml file

<web-app>  

  

<servlet>  

<servlet-name>PramodDwivedi</servlet-name>  

<jsp-file>/welcome.jsp</jsp-file>  

</servlet>  

  

<servlet-mapping>  

<servlet-name>PramodDwivedi</servlet-name>  

<url-pattern>/welcome</url-pattern>  

</servlet-mapping>  

  

<context-param>  

<param-name>dname</param-name>  

<param-value>sun.jdbc.odbc.JdbcOdbcDriver</param-value>  

</context-param>  

  

</web-app>  

welcome.jsp

<%   

  

out.print("Welcome "+request.getParameter("uname"));  

  

String driver=application.getInitParameter("dname");  

out.print("driver name is="+driver);  

  

%>  

Output:

Fig: JSP Application Object