JSP config implicit object example



In JSP, a config is an implicit object of type ServletConfig. This object can be used to get the initialization parameter for a particular JSP page. The config object is created by the web container for each JSP page.
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Generally, it is used to get the initialization parameter from the web.xml file.

Example of config implicit object:

index.html

<form action="welcome">  
   <input type="text" name="uname">  
   <input type="submit" value="go"><br/>  
</form>  

web.xml

<web-app>

    <servlet>
        <servlet-name>sonoojaiswal</servlet-name>
        <jsp-file>/welcome.jsp</jsp-file>

        <init-param>
            <param-name>dname</param-name>
            <param-value>sun.jdbc.odbc.JdbcOdbcDriver</param-value>
        </init-param>

    </servlet>

    <servlet-mapping>
        <servlet-name>sonoojaiswal</servlet-name>
        <url-pattern>/welcome</url-pattern>
    </servlet-mapping>

</web-app>

welcome.jsp

<%   
   out.print("Welcome "+request.getParameter("uname"));  
  
   String driver=config.getInitParameter("dname");  
   out.print("driver name is="+driver);  
%> 
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