How to pass parameters to whole web application – ServletContext

Here’s a serlvet code example to demonstrate how to pass a parameter to whole web application by using ServletContext “init-param” in web.xml.

In the deployment descriptor (web.xml)

Put your parameter value in “init-param” and make sure outside the “servlet” element


        <servlet>
		<servlet-name>ServletName</servlet-name>
		<servlet-class>com.mkyong.ServletDemo</servlet-class>
	</servlet>

	<context-param>
			<param-name>email</param-name>
			<param-value>admin@email.com</param-value>
	</context-param>

Servlet code


public void doGet(HttpServletRequest request, HttpServletResponse response)
	throws IOException{
	
		PrintWriter pw = response.getWriter();
		pw.println(getServletContext().getInitParameter("email"));
		
	}

The “getServletContext().getInitParameter(“email”)” method is use to get the ServletContext parameter value in web.xml. In addition , this parameter is accessible by the whole web application.

Here’s a example to pass parameter to a servlet only

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mkyong

Founder of Mkyong.com, love Java and open source stuff. Follow him on Twitter. If you like my tutorials, consider make a donation to these charities. Read all published posts by

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Pham Huu Bang
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Pham Huu Bang

it was wrong “init-param” and make sure outside the “servlet” element

Laurent
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Laurent

Thanks a lot for all your differents articles. That’s really a great pleasure and help to find and read them.

kishore
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kishore

thanks a lot

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How to pass parameters to a servlet – ServletConfig

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