Hello,

Init parameters are added between the <init-param></init-param> tags under the <servlet></servlet> tags in the web.xml file.

For Example:

<servlet>
<servlet-name>MyServlet</servlet-name>
<servlet-class>roseindia.ReadInitParametersServlet</servlet-class>
<display-name>Read Initialization Parameters of the Servlet</display-name>
<init-param>
<param-name>emailHost</param-name>
<param-value>151.68.167.201</param-value>
</init-param>
<init-param>
<param-name>webMaster</param-name>
<param-value>Savitha Rajeev</param-value>
</init-param>
</servlet>

And then use the following code in servlet to read the parameter values.

public void init(ServletConfig config) throws ServletException {
String emailHost = config.getInitParameter("emailHost");
String webMaster = config.getInitParameter("webMaster");
}

or

public void service(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

String host = getServletConfig().getInitParameter("emailHost");
String master = getServletConfig().getInitParameter("webMaster");
}

Yes you must restart the application in the production environment.

If you server supports the reload of application then not required to restart the application server.

For example you can use tomcat manager to restart the application.


Thanks